MSS SP-96

MSS SP-96-2001

Guidelines on

Terminology for

Valves and Fittings

Standard Practice Developed and Approved by the Manufacturers Standardization Society of the Valve and Fittings Industry, Inc.

Vienna, Virginia 22180 127 Park Street, NE

(703) 281 -661 3

COPYRIGHT Manufacturers Standardization Society of the Valve and FittingsLicensed by Information Handling ServicesCOPYRIGHT Manufacturers Standardization Society of the Valve and FittingsLicensed by Information Handling Services

MSS STANDARD PRACTICE SP-96

This MSS Standard Practice was developed under the consensus of the MSS Technical Committee 302 and the MSS Coordinating Commitee. The content of this Standard Practice is the result of the efforts of competent and concerned volunteers to provide an effective, clear, and nonexclusive specification that will benefit the industry as a whole. This MSS Standad Practice is intended as a basis for common practice by the manufacturer, the user, and the general public. The existence of an MSS Standard Practice does not in itself preclude the manufacture, sale, or use of products not conforming to the Standard Practice. Mandatory conformance is established only by reference in a code, specification, sales contract, or public law, as applicable.

This document has been substantially revised from the previous 1996 edition. It is suggested that if the user is interested in knowing what changes have been made, that direct page-by-page comparison should be made of this document with the previous edition

Any part of this standard may be quoted. Credit lines should read Extracted JLom MSS SP-96, 2001, with permission of the publisher, the Manufacturers Standardization Society. Reproduction prohibited under copyright convention unless written permission is granted by the Manufacturers Standardization Society of @ the Valve Fittings Industry, Inc.

OnginaUy Approved September 1986

Copyright w, 1986 by Manufacturen Standardization Society

of the Valve and Fittings Industry, inc.

Printed in U.S.A.

1



FOREWORD

Valves and fittings were being manufactured in the United States for many years before the first standards were written. In selecting names for these products and their component parts, manufacturers chose terms which seemed appropriate to the configuration and intended use.

Uses expanded and changed, and manufacturers sometimes found that logical choices of terminology had been preempted by other products. The result has been that valves, fittings, and parts of similar configuraton or intended use sometimes have more than one name. in other cases, the same name has been apphed to assembiies or parts of different configuration and function.

The absence of a common statement of preferred terms has contributed to the variations of terms used by individual manufacturers.

This Standard Practice has been developed to serve two functions:

1) To assist the users of valves and fittings in communicating with their manufacturers.

2) To promote standardization in the usage of terms in industry.

The Standard Practice provides definitions of the preferred items, and provides cross referencing to the appropriate preferred terms for other commonly used terms. It is subject to the periodic review procedure common to standards.



CONTENTS

SECTION PAGE

1 . SCOPE ..................................................................................................................... 1 2 . DOCUMENT SOURCES ............................................................................................... 1 3 . GLOSSARY .............................................................................................................. 3 4 . ABBREVIATIONS ................................................................................................... 25

... lll



GUIDELINES ON TERMINOLOGY FOR

1. SCOPE

VALVES AND FITTINGS

AFS

1.1 This Standard Practice lists and defines principle terms and acronyms widely used to describe general purpose valves and fittings. It is comprised of separate sections which contain:

Acronyms for organizations whose documents are applicable to valves and fittings and a brief summary of the applicable area of interest.

A glossary of terms used in valve and fittings specifications to describe design, operation, and performance characteristics.

Abbreviations commonly used in the valve and fittings industry.

2. DOCUMENT SOURCES

A number of technical societies, trade associa- tions, and governmental agencies in the United States of America promulgate codes, standards, or specifications that are pertinent to valves and fittings. Some are recognized throughout the valve and fittings indusy, some are relevant to specific services, while others are applicable to all usages within a specific industry. Most of these organizations and their standards or specifications are designated by letters. The organizations most fiequently referenced and their relationship to the valve and fittings industry are listed below:

AAR

AC1

ABS

Association of American Railroads - publishes design and dimensional standards for bronze valves and 300 psi pressure rating, malleable pipe- fittings used by railroads. Alloy Castings Institute - publishes material specifications for heat and corrosion resistant alloys. American Bureau of Shipping - publishes safety standards for shipbuilding, including specifications for valves and fittings used in commercial maritime service.

AGA

AGMA

AISC

AIS1

ANSI

APFA

API

ASME

American Founemens Society - publishes information on casting methods, procedures, and practices that are basic references for product design, procurement, and inspection of cast products. American Gas Association - publishes standards for approval, certification, and application of gas appliances and the accessories of gas appliances. American Gear Manufacturers Asso- ciation - provides educators to the gear industry; publishes information and standards on gears, gear-cutting and gear-checking equipment. American Institute of Steel Construc- tion - provides advisory services to help choose and utilize the most suitable type of structural steel design. Obtains accep- tance for new design and construction techniques. American Iron and Steel Institute - publishes ferrous material specifications and test procedures. American National Standards Insti- tute - provides a method for achieving consensus on standardization matters involving codes and standards developed by other organizations, that are applicable to the design, dimensions, construction, testing, and application of valves, fittings, and piping. American Pipe & Fittings Association- encourages, contributes to, and cooperates in the development of standards for products within the scope of the association. American Petroleum Institute - publishes purchasing specifications for valves and fittings used in the production, transportation, and processing of liquid and gaseous hydrocarbon materials. American Society of Mechanical Engineers - publishes codes for the construction of pressure vessels and related appurtunances including valves and fittings.

1



ASNT

ASQ

A C T X A n u 11.11

AWS

AWWA

CI

CDA

DIPRA

FCI

FMRC

FED STDS

American Society for Non-Destructive Testing - publishes specifications for non-destructive examination procedures and methods for parts of valves and fittings. American Society for Quality Control- publishes specifications applicable to valve and fitting components covering systems and procedures for quality as surance.

Materials - publishes materials, products, systems, services, including test methodology used in the manufacture of valves and fittings. American Welding Society - publishes specifications for materials and procedures used in welding and weld repair. American Water Works Association- publishes standards for valves and piping used in water supply systems, Chlorine Institute - publishes special material-requirements and procedures for piping components used in the production and handling of chlorine. Copper Development Association - publishes chemical specifications for copper alloys; supplements ASTM specifications for valve and fitting materials. Ductile Iron Pipe Research Associa- tion - publishes information on research, design, applications, and corrosion protection for ductile iron pipe. Fluid Controls Institute - publishes standards and practices for capacity, design, efficiency, manufacture, and terminology of control equipment, including valves for gas, hydraulic, pneumatic circuits, and steam. Factory Mutual Research Corporation - publishes insurance-company standards for fire protection, inspection, and consultation and provides certification testing for fire- prevention and control equipment and procedures. United states Government Specifications and Standards - publishes standards for valves and fittings. Used for non-military and

A,,A,..... C-,:,L, C-.. T-..i-- "-1 -UllU1111 U W U i U b y L W 1 L G J b l i l ~ 1111U

2

IEEE

IFI

ISA

IS0

IEC International Electrotechnical Com- mission - publishes standards and specifications for control valves, electrical and electronic systems and apparatus. Institute of Electrical and Electronics Engineers - publishes standards for electrical and electronic equipment. Industrial Fasteners Institute - publishes specifications for bolting and faskiers used ili t h manliuficte f valves and fittings. Instrument Society of America - publishes standards, educational, and reference material related to the theory, design, manufacture, and use of instruments and controls in many scientific and industrial applications including automatic fluid-control systems. International Organization for Stand- ardization - publishes technical specifications and recommendations promoting the development of international standards. . Intemational

O standards for valves, piping, and fittings. JIC Joint-Industry Conference - publishes

hydraulic and pneumatic standards that af?ect valve and fitting specifications and designs.

MCA Manufacturing Chemists Association - publishes chemical statistics ,hand- books and manuals of recommended practices and guidelines for handling chemicals.

MSS Manufacturers Standardization Socie- ty of the Valve and Fittings Industry - publishes standard practices for dimensions, marking, terminology, quality, testing, and other information for manufacturers and users of products of the valve and fittings industry.

MIL-STDS U.S. Military Specifications and Standards - standards for valves and

fittings used by the Department of Defense.

NACE National Association of Corrosion Engineers - standards and guidelines related to corrosion control; special material requirements and procedures for piping components used in sour gas and other corrosive services.



NSF

PFI

RDT

NEMA National Electrical Manufacturers Association - publishes specifications for electrical equipment. National Fire Protection Association - publishes design and performance advisory standards for valves and fittings.

NFPA National Fluid Power Association - publishes technical standards for pumps, valves, cylinders, and fittings used in transmitting energy by means of fluid within a pipe, primarily for purposes of material handing or mechanism operation and control. NSF International - publishes public and environmental health standards. Pipe Fabrication Institute - publishes standards and technical bulletins for high- pressure, high-temperature piping systems and components for chemical plants, refmeries, central power-stations, ships, etc. Reactor Development and Tech- nology Division of U.S. qNuclear Regulatory Commission - publishes design, performance, and quality assurance standards for valves and fittings.

S A E Society of Automotive Engineers - publishes materials and dimensional standards for fittings.

SAMA Scientific Apparatus Makers Associa- tion - publishes standards covering process measurement and control devices including valves, scientific apparatus, and laboratory equipment.

SSPC Society for Protective Coatings - publishes specifications for surface preparation and coating of valves and other piping elements.

NFPA

UL

TAPP1 Technical Association of the Pulp and Paper Industry - publishes test procedures for laboratory apparatus and process control equipment for pulp, paper, and related industries. Underwriters7 Laboratories - publishes safety and performance standards and provides certification testing for valves, actuators, and fittings used in fire-protection systems and for hazardous-fluid systems.

U.S. DOT Department of Transportation - publishes regulations applicable to valves and fittings used in the transportation of gas, oil, and other hazardous materials in interstate commerce.

3. GLOSSARY

This section defines terms and expressions used to describe the design, operation, and performance of valves, valve components, and fittings. Where more than one expression is used to describe a feature, the preferred term is defined, and synonymous or related terms are referred to the preferred term. Flow phenomena are excluded fiom this listing. Pipe hanger and support terminology are also excluded, but may be found in MSS SP-90, Guidelines on Terminoloa for Pipe Hangers and Supports. Words underlined in the definitions may be found defined elsewhere in this glossary.

3



3. GLOSSARY

TERMS

actuator:

actuator stem-force:

__L._I__ LL-.-L. lCiLUllUI L1UUSL.

actuator torque:

adjustable travel-stop:

air-cylinder actuator:

air-motor actuator:

all iron:

angle-disc check valve:

angle non-return valve:

angle pattern:

angle-stop vaive:

angle-stop check valve:

angle valve:

automatic control:

DEFINITION

the mechanical, hydraulic, electric, or pneumatic device or mechanism used to open, position, or close a &.

the force produced by an actuator used to position a valve stem.

a-ka; fr= &e iiiG-al~Eg fl&-e5 driving components of a valve. expressed in pounds or kilo newtons.

a turning moment transmitted through the mounting flanges and driving components of a a, expressed in pound foot or Newton meter.

a device attached to a & or actuator that limits the range of motion of a valve closure-member.

a type of power actuator using air to drive a cylinder mechanism.

a type of power actuator wherein an air motor is used to supply the force to drive the valve closure-member, often through a geared mechanism.

a trim class used in cast iron valves wherein the seating surfaces and stem, when present, are made of iron or steel.

a check valve with a element in an ande pattern body.

See ande-stop check valve.

a in which the body ends are at right angles.

See annle valve.

an angle pattern variant of a globe-type stopcheck valve.

an angle pattern variant of the globe valve only (other types of ande valves must be designated specifically, such as angle-plug valve).

an action derived fiom the combination of a valve. actuator, and sensing and activating circuits, programmed to regulate a fluid flow or process by throttling the valve closure-member in response to process changes without operator intervention.

back face: the surface of a flange that is opposite the gasket face.

4



@ 3. GLOSSARY TERMS

back seat:

back seat bushing:

ball:

ball check valve:

ball port:

ball-type disc:

ball valve:

bell end:

bellows-seal valve:

bi-directional valve:

blind flange:

block & bleed valve:

blowdown valve:

blowoff valve:

body:

body-bonnet joint:

body end:

DEFINITION

a seat on the bonnet or bonnet bushing that contacts a corres- ponding seating surface of the - when the - is fully retracted.

See bonnet bushing and back seat.

the closure member in a ball valve or the closure member in a ball check valve.

a check valve in which the check closure member is a ball.

the flow-way opening in the closure member of a ball valve.

a with a spherical seating, surface.

a close.

whose closure member is spherical and rotates to open or

See female end.

a & having a seal utilizing a bellows.

a & having substantially equivalent flow and shut-off capability in both directions.

a flanpe with no flow-way bore, used to provide a pressure-tight closure of a flanged opening.

a & with two seatinp surfaces that provide simultaneous blockage of flow from both valve ends and a means for draining or venting the cavity between the seatinp surfaces.

See blowoff valve.

a vessel or piping.

used to release the pressurized contents of a pressure

the principal pressure-containing shell of a ends adapted for connecting to piping. See also valve body.

or fitting, that has

the connection of a valve M to the bonnet (such as threaded uni&$ breech lock, bolted, welded, or pressure seal type, or a combination thereof; a capability for seal welding may be included).

that portion of the M which is adapted for connecting to piping components.

5


MSS STANDARD PRACTICE SP-96 I

3. GLOSSARY

TERMS

body end-port:

body flange:

ody plug:

body seat:

body tap:

bolted bonnet:

bolted cap:

bolted cover:

bolted gland:

bonnet:

bonnet bolting:

bonnet bushing:

bonnet flange:

bonnet gasket:

bonnetless valve:

bonnet ring:

boss:

brazing end:

breech lock:

DEFINITION

the flow opening in the body end.

the flange on a valve body to which the bonnet or cover is bolted.

see m. a tapped hole in a pressure-boundary wall often used for connection to a drain or bwass.

a construction in which the bonnet is bolted in the &.

See bolted cover.

a cover attached to a by bolting.

See packing gland.

O a valve body closure component that contains an opening for the - stem. the bolting that secures a bonnet to a valve body.

an insert in a bonnet that serves as a also provide a back seat surface.

or & guide and may

the flange on a bonnet through which the bonnet is boltedto the valve body.

the gasket that seals a body-bonnet joint on a valve.

a with no bonnet.

See union nut.

a raised area on the surface of a component.

an end of a or fitting adapted for brazing to pipe or tube.

a connection means between two components characterized by interrupted lug-type elements that are engaged by a partial turn of one part inserted into or over the other.

6



3. GLOSSARY

TERMS

bronze mounted:

bushing:

butterfly valve:

butt-welding end:

bypass:

bypass valve:

cage:

cap:

center-guided check valve:

center-to-end:

center-to-face:

chainwheel:

chain wrench:

check valve:

clamp gate valve:

DEFINITION

a trim class used in cast iron valves wherein the seating surfaces, and when present the stem. are made of brass or bronze.

See pipe bushing.

a obsthicts flow when the & is rotated to block the flow.

that uses a rotatable & as a closure member and

an end of a valve or fitting adapted for welding to pipe by abutting the end and welding within the groove formed between the prepared ends.

a piping loop provided to permit flow around a valve closure- member in its closed position.

a valve used in a bvuass.

in a globe valve, an element that fully surrounds the Valve Disc providing support and alignment to the disc; in a ball check valve, a part provided to guide and restrict the motion of the check m. a fitting or system.

component used to effect closure of a piping

a check valve in which the closure member is perpendicular to the flow.

the linear distance fiom the centerline of a port-passage end of a non-flanged end fininn or anale valve to an opposing port- passage end.

the linear distance fkom the centerline of a port passage of an flanged end fitting or ande valve to an opposing flanged end.

a manual actuator that uses a chain-driven wheel to turn a ya& stem, handwheel, or gearing.

a special form of chainwheel.

a unidirectional valve that is opened by the fluid flow in one direction and closes automatically to prevent flow in the reverse direction.

a gate valve in which the & and bonnet are held together by a U-shaped clamp that passes through lugs cast on the and bonnet, also called a saddle gate or clipgate &.

7



3. GLOSSARY

TERMS

closure member:

cock:

cold working pressure (CWP):

compact wafer:

composition disc:

compression fitting:

compressor:

concentric reducer:

control valve:

corporation stop:

coupling:

cover:

cover bolting:

cover gasket:

cover ring:

cross:

cross, reducing:

DEFINITION

a & component that is positioned in the flow stream to permit flow or to obstruct flow, depending on its closure position; in a specific design it may also be called a &, wedge, dun, ball, g@e, diauhragm or other fnctionally similar expression (see also oDerator).

a form of plug valve that depends exclusively on sealing of conical surfaces to prevent leakage through the & and to the atmosphere.

the maximum pressure at which a e or fittine, is allowed to be used at ambient temperature.

a wafer & with a reduced outside b& diameter or slots to provide external flange-bolt clearance.

a valve closure-member containing a non-metallic component for sealing or stopping flow.

a fittine, for pipe or tube that seals and grips by the radial deformation of circumferential sealing-elements.

in a diaphragm valve, a rigid member attached to the valve stem to support the diaphragm and to force it against the &.

a reducer with both openings on the same centerline.

a in a system.

See cock.

a fitting used to make a linear connection between two lengths of piping.

a & component that provides a closure for an opening into the valve.

the bolting that fastens a covef to a valve.

the gasket in a & that seals the cover joint. the union ring that connects a union cover to the of a valve.

a fitting having four openings of equal size in one plane at 90" angles.

a

that provides the means for varying the rate of fluid flow

with one or more openings smaller than the inlet.

8



3. GLOSSARY

TERMS

cycle of operation:

cylinder actuator:

diaphragm:

diaphragm actuator:

diaphragm valve:

dielectric union:

disc:

disc face:

disc guide:

disc hinge-pin:

double block & bleed:

double disc:

drain:

drainage fitting:

drop elbow:

drop tee:

DEFINITION

the actuation of a fiom one limit of its operational position to the opposite limit and return to its original position. Example: full-closed to full-open to full-closed.

a fluid-powered actuator that converts hydraulic or pneumatic pressure acting on a piston within a cylinder into a mechanical force to impart motion to a valve closure-member.

a valve component consisting of a flexible sheet of material arranged to contain a fluid and to which mechanical or fluid forces may be applied to deform the sheet to interrupt fluid flow (see closure-member).

a fluid-powered actuator that uses hydraulic or pneumatic fluid pressure acting on a diaDhram to develop force to move the closure-member.

a diaDhram against a raised section or weir on the passageway.

that permits throttling of fluid flow by forcing a flow

See insulating union.

See closure member.

the seating surface of a &.

a guide that aligns the & relative to the e. a pin that supports the of a & or tiltina-disc check valve.

See block & bleed valve.

a two-piece & used in a gate valve.

a connection provided in a valve bodv, bonnet, or purpose of releasing fluid.

for the

a non-pressure rated fitting having an inside diameter the same as the connecting piping, with a shoulder against which the piping abuts (such fittings provide substantially continuous internal flow-passage surfaces).

an elbow having two integral lugs or ears with screw holes for mounting (sometimes called drop-ear or drop-eared elbow).

a tee having two integral lugs or ears extendmg fkom the side opposite the outlet and equipped with holes for mounting (sometimes called a drop-ear or drop-eared tee).

9



3. GLOSSARY

TERMS

drum trap:

dual-sealing valve:

eccentric reducer:

eccentric plug valve:

elbow:

elbow, long-radius:

elbow, short-radius:

elbow, reducing:

elbow, side-outlet:

elbow, street:

electric-motor actuator:

end connection:

end-to-end dimension:

end-entry ball valve:

expansion joint:

eye bolt:

face-to-face dimension:

female end:

DEFINITION

a drainage fitting designed to provide a liquid seal in a drain line and characterized by an upright, cylindrical body.

a which uses redundant seat-sealing means.

a reducer with the small end off-center.

a quarter-turn valve with either the journal or located off-center.

a fitting used to chege the direction of piping.

an elbow with the center-to-face distance 1% times the nominal size of the elbow.

an elbow with the center-to-face measurement equal to the nominal size of the elbow.

an elbow with ends of different sizes.

an elbow with an additional outlet extending from the side of the fitting usually 90 degrees to the plane of the inlet and outlet.

an elbow having an external connection on one end and an internal connection on the other.

a power actuator for valves wherein a gear-reduction unit is powered by an electric motor.

the provision made on a valve, fitting, or pipe for attachment to another piping component.

the overall length, along the axis of the pipeline, of a &, fittina, or pipe.

a bail valve design in which the removal of an end piece.

and are accessible by the

a pressure-tight connection device that accommodates relative movement of attached piping.

a threaded bolt which has a head fashioned to accommodate a cylindrical cross-pin connection.

the dimension from the face of the inlet port to the face of the outlet port of flanged valves or fittings.

a socket, solder end, bell end, or internally threaded end of a valve, fitting or pipe which accepts the plain end or externally threaded end of a piping component.

10



3. GLOSSARY

TERMS

finned bonnet:

fitting:

fitting, branch welding-outlet:

fitting, butt-welding:

fitting, flanged:

fitting, flared:

fitting, flareless:

fitting, socket-welding:

fitting, solder-joint:

fitting, threaded:

flange:

flange facing:

flange, lap-joint:

flange, reducing:

flange, slip-on:

DEFINITION

a bonnet with external fins located between the packing chamber and flow area.

connector or closure used with piping or piping components to form fluid lines and passages with a desired system configuration.

a that is attached to the run pipe by welding (the branch pipe is usually attached by welding, socket welding, or threading).

a fittinn whose end connections are adapted for butt-welding to pipe or to other butt-welding fittings or valves.

a fittinn having flanved end end connections.

a f a designed for attachment of a tube having a pre-formed flare on the tube end.

a tubing finine, which seals and grips by means which do not involve a pre-formed flare at the end of a tube (see compression fitting).

a fittinn with end connections having a socket configuration to fit the ends of the pipe and in which the pipe is fillet welded in place on its outside diameter.

a copper or copper alloy with solder end end connections manufactured to permit joining to copper tube, a solder-end fitting or by soldering or brazing.

a fittinn with threaded end connections for attachment to threaded pipe.

an annular collar designed to permit a bolted connection with similar collars.

the geometry of the mating surface of a flange.

a flange that has a radius at the intersection of the bore and the flange face in order to slip over a lap-joint stub end; this flange can be swiveled around a lap-ioint stub end in order to align bolt holes.

a flange of a given size with a flow bore of a smaller size used to make a joint between different pipe sizes.

a flange that slips over the end of a pipe or =and is fillet welded in place.

11



3. GLOSSARY

TERMS

flange, socket-welding :

flange, threaded:

flange, welding-neck:

flanged end:

flangeless valve:

flat-faced flange:

flat full-face gasket:

flexible-wedge disc:

floating ball-ball valve:

flow regulation:

follower gland:

four-way valve:

full-opening-through- conduit valve:

fusible plug:

gate:

gate valve:

DEFINITION

a flange having a socket configuration that fits the end of a pipe for fillet welding.

a low-hub flanve with a threaded bore for assembly with 4Lt,-...4,.a .A..,. uuoauou p y u .

a flanpe with a tapered hub bored to match the inside diameter of matching pipe and with the hub beveled for butt welding to the Pipe.

a type of end connection on a to other components with mating flanves.

or a fitting, used for joining

a y-& intended to be mounted between pipe flanges with span bolts passing fiom pipe flange to pipe flange. The WS may have locators for line centering.

a flange that is flat from the flange periphw to the flow or access opening.

a flat gasket that contacts the entire surface of a flat-faced flanve. O a gate valve disc tha has a solid center but which is flexible at the sealing periphery.

a ball valve design with a held in position only by two seats.

control of flow passing through piping.

the element used to compress the gasket or sealing gasket of a mechanical joint.

a flow through the valve and connected piping system.

with four ports arranged to control the direction of fluid

a attached piping.

whose opening is substantially equivalent to bore of

a non-reclosing plun, designed to melt at a specified temperature.

the closure member of a gate valve.

a with a closure member, such as a gate. wedge, disc, or double disc, that moves on an axis perpendicular to the direction of flow.

12


MSS STANDARD PRACTICE . SP-96

3. GLOSSARY

TERMS

gland:

gland flange:

gland follower:

globe valve:

grooved end:

guillotine valve:

handle-bar union:

handwheel :

hard facing:

hinge:

See packing gland and follower gland.

a flange bearing against a packing gland used to compress packing.

See packing gland.

a on a axis perpendicular to the @.

with a closure member, such as a & or &, that moves

a circumferential recess that is cast, cut, or otherwise formed onto a fittinn or end to form a .restrained joint when used with the proper gasket and coupling.

See knife-gate valve.

a union nut that has one or more projections that may be struck with a hammer for quick opening or closure (also known as lug-nut or high-speed union).

a rimmed component designed to facilitate manual actuation of a e. a deposit of hard, wear- and corrosion-resistant material applied at the seating surfaces or other parts of a subject to wear.

in a swing check valve, the pivotal element that supports the relative to the bodv seat.

assembly

hinge pin: See disc hinge-pin.

holiday test:

hydraulic actuator:

DEFINITION

a nondestructive test of the coating of a &, hydrant, or component part thereof, performed to electrically determine the presence, if any, of voids or holidays in the coating.

a device that converts hydraulic energy into mechanical force and motion for positioning a valve closure-member.

in-line check valve: See center-guided check valve.

inside-screw, non-rising stem: a iype of gate valve design in which the rises on the threaded part of the stern instead of the rising through the bonnet (the stern does not rise or descend as the stern is turned).

inside-screw, rising-stem: a type of gate or globe valve design in which the stern has both rotary and axial motion and rises as the stern is turned (the threads are between the stem packing and the closure member).

13



3. GLOSSARY

TERMS DEFINITION

insulating unions:

junk ring:

knife-gate valve:

lantern gland:

lantern ring:

lantern ring packing-chamber :

lap-joint stub end:

lateral:

lateral, reducing:

lateral, straight:

lay length:

lens joint:

lever actuator:

used to mechanically join piping for pressure-tight transmission of fluids, with electrical insulation separating the joined piping (also known as dielectric u s ) .

See packing washer.

a type of gate valve using a thin, flat m, usually used in controlling slurries.

See lantern ring.

a rigid spacer-ring used in the lantern ring ype of packing chamber to permit lubrication of the packing, purging of the - shaft or stern area, or a leak-off system.

a above and below the lantern ring.

sealing chamber with a lantern ring and rings of packing

a fittinn, normally used with a lap-joint flange, consisting of a cylinder or bmel with an integral flat ring or lap around one end, with a radius at the external intersection of the barrel and the lap, and an opposing end that is beveled for butt-welding to matching pipe (the lap face typically has a spirally serrated finish to serve as a raised-face gasket for the flange in lap-joint flange connections).

a three-way fittinn having two pipe ends opposite each other in a straight run and a branch outlet projecting from the run at an angle, usually 45".

a lateral with the branch outlet smaller than the run.

a lateral with all three openings, the run as well as the branch outlet, the same size.

the effective length of the or fittina along the axis of the pipeline which if the or e (along with gaskets) were somehow removed would be the gap remaining between the pipe ends.

a bolted flange joint characterized by metal-to-metal sealing involving the inelastic deformation of the flange mating surfaces of a pierced, lens-shaped member.

an actuator that includes an arm or lever that is manually moved to operate a valve.

14



3. GLOSSARY

TERMS

lift check valve:

limit switch:

lined:

live loading:

lubricant:

lubricated plug valve:

lug valve:

lug-wafer valve:

lugged valve:

male end:

mechanical connection:

mechanical joint:

memory stop:

modulating:

multi-turn actuator:

DEFINITION

a check valve with a closure member that is lifted by the force of the fluid flow.

a switch (electrical, pneumatic, or hydraulic) that senses a vaJs closure-member at a particular position.

a term applied to valves. fittings, or piping having internal surfaces of protective materiais to enhance resistance to corrosion, erosion, or contamination.

a means of maintaining a compressive load on bolted assemblies, such as by the use of disc springs (such as Belleville washers) on a packingglano.

a material (such as iight grease or oil) that is applied to a vaJs component to reduce friction.

a plug valve in which the plun rotation and sealing can be assisted by sealant applied under external pressure.

a valve with short face-to-face dimensions in proportion to the fluid-passage diameter designed to be bolted to one or both flanges in a line by the use of fasteners, which are threaded into lug protrusions of the valve body.

~

See lup valve. single flanged valve and wafer valve.

See lup valve and single flanged valve.

the externally threaded or plain end of a pipe, tube, valve or fittinn.

a term used to designate various methods for assembling product components by mechanical means.

a bolted joint of a packinp chamber design for coupling valves, fittings, and pipe utilizing a follower gland to compress the sealing gasket.

an accessoq on a valve that provides for repeatable stopping of the closure member at a position other than fully open or closed.

See automatic control.

an actuator that transmits a torque to the revolution.

for at least one

15



3. GLOSSARY

TERMS DEFINITION

National Standard Thread:

nipple:

nominal pipe size .(NPS):

non-lubricated plug valve:

non-return valve:

non-rising stem:

obturator:

open left:

open right:

operating cycle:

operator:

O-ring unions:

outside screw & yoke (OS & Y):

P-trap:

packing:

packing assembly:

packing box:

packing chamber:

a dimensional system of threading commonly used on pipe, pipe valves, and fittings in the U.S, including tapered (NPT), straight, (NPSM) and Dryseal thread forms.

a piping component consisting of a short piece of pipe with both -..Am owto-all.7 thvn,,AeA UIlUJ urzwiiiuii, ..-vuuvu.

a size-identification number, not necessarily an actual dimension.

a plug valve that does not require lubrication.

See stop check valve.

a valve stem that does not move into and out of the &e when the is actuated.

See closure member (this term is used in international standards).

counter-clockwise rotation of an actuation device to open a &.

clockwise rotation of an actuation device to open a &.

See cycle of operation.

a person who causes a to be actuated.

pipe unions using O-rings for pressure sealing.

a & design that houses the packing between the and the valve body.

threads

a drainage fitting having a vertical d e t into a F-shaped water- seal section that has a horizontal or 90 outlet.

a material that provides a seal around a movable component through a pressure boundary (q.v., packing around a valvestem).

a --sealing system consisting of a material or one or more mating components contained in a chamber, which may provide an effective seal through a manually adjustable means of compression.

See packinv chamber.

the part of the packing assemblv containing the packing used to seal against leakage around a movable component, such as a - stem or shaft (also called stuffing box or packing box.

16



3. GLOSSARY

TERMS

packing gland:

packing, injection:

packing nut:

packing washer:

parallel-disc gate valve:

parallel expanding-disc gate valve:

parallel sliding-disc gate valve:

part-turn actuator:

pinch valve:

pipe bushing:

pipe plug:

pipe thread:

piston check valve:

pivot pin:

plain end:

plug:

plug cock:

DEFINITION

a component used to compress packing. Also called a packing follower.

a material used in a sealing system that uses external pressure for injection into a packing chamber.

a nut used on a packing assembly to compress packing, often used in conjunction with a packing Pland.

a spacer placed at the end of a set of packing to prevent extrusion of packing.

a double-disc gate valve design in which the loaded against the sliding-disc gate valve).

faces are parallel and are (see parallel exmndina-disc gate valve and parallel

a double-disc gate valve design in which the independent of each other, and loaded against the by a wedging mechanism between the discs and line pressure on downstream side.

faces are parallel,

a type of double-disc gate valve in which the faces are parallel, independent of each other, and loaded against the seats by a spring and line pressure on the downstream side.

an actuator that transmits a torque to a for less than one revolution.

a is ?pinched to effect closure.

design having a flexible tube or hose for a flow passageway, which

a fittinn with one external and one smaller internal end.

a threaded device with no opening used to provide closure of an internally threaded port.

See National Standard Thread and threaded end.

a lift check valve design in which the closure member acts like a piston within a cylinder.

See hinge D~IL

a male end on a tube, pipe, valve, or fitting that inserts or engages into a female end or mechanical joint of another piping component.

a closure member used in a plug valve.

see &.

17



3. GLOSSARY

'TERMS

plug, countersunk:

plug, headed:

J..- ,-li-#.. pue -0".

plug valve:

pneumatic actuator:

pneumatic-motor actuator:

pressure-seal gasket:

pressure-seal joint:

push-on joint:

quarter-- valve:

quick-opening valve:

quick-opening control valve:

raised face:

reduced-port valve:

DEFINITION

a tapered threaded end vive vlug having a square or hexagon countersunk socket.

a pive vlug; having a hexagonal or square head.

a ya& in which the closure member is of cylindrical or conical shape and can be rotated into alignment with the flow passageway and in which sealing is effected by the fit of the cylinder or cone into the mating surface of the bodv.

a device that converts pneumatic pressure into mechanical motion and force to move a valve closure-member.

See air-motor actuator.

the sealing ring member of a pressure-seal joint.

a cover or bonnet closure-assembly in which internal fluid pressure-force on the cover or bonnet increases the compressive loading on the sealing gasket.

a generic term describing jointing designs that utilize a rubber gasket that fits into an annular recess inside of a pipe, fittinn, or socket end and is compressed radially upon entry of the beveled plain end of a pipe or fitting.

a ya& in which the closure member is rotated approximately 90" to move from full-open to full-closed position.

a ya& designed to open or close quickly.

a Valve in which the closure member reaches maximum flow with minimum lift.

the annular surface on certain types and classes of flanves that projects above the bolting ring and provides the gasket-compression area.

a ya& equipped with a reduced flow-passageway at the closure member for a given end connection size (also called a restricted-port valve).

reducer: a fittinq that functions as a couuling but has a smaller pipe size on one end.

18



3. GLOSSARY

TERMS

regulating valve:

relief valve:

remote control:

restrained joint:

retuni bend:

return-bend, long radius:

return-bend, short radius: /

ring joint:

rising stem:

roof connection:

running trap:

rupture disc:

safelyrelief valve:

safety valve:

DEFINITION

a through the e. designed to control the flow rate or pressure of fluid flowing

a when its pressure setting is exceeded.

designed to actuate automatically to reduce its internal pressure,

a system for operating a valve actuator fi-om a distant location.

a rubber-gasket joining system for valves. fittings, and pipe that includes provisions to prevent axial joint-separation due to hydraulic intemal- pressure.

a U-shaped fitting that changes the direction of piping 1 SO.

a return bend that has a center-to-center dimension three times the nominal size of the fitting.

a return bend that has a center-to-center dimension two times the nominal size of the fitting.

a bolted flange design in which the adjacent flange faces contain grooves designed to receive a shaped, continuous ring arranged in such a way that the ring is compressed by the mating flange grooves to provide a seal.

a valve stem that moves into and out of a &when the is operated. /

a drainage fitting used with roof flashing and to extend the length of a vent Pipe.

a water-trap drainwe fitting having a horizontal inlet into a U-shaped water seal section and with a horizontal outlet (the fitting is usually funiished with a vent opening extending vertically opposite each leg of the U-bend).

a pressure-relieving device designed to burst at a specified internal pressure.

a pressure-relief valve suitable for use either as a safety valve or &f depending on application.

a pressure-relief valve characterized by rapidly opening operation.

19



3. GLOSSARY

TERMS

screwed bonnet:

screwed end:

screwed flange:

seal, water:

seal-welded bonnet:

sealant:

seat:

seat bushing:

seat insert:

seat ring:

seating surface:

seif-controlled regulator:

shaft:

shouldered end:

silent check valve:

silver brazing:

single-flanged valve:

DEFINITION

See threaded-in bonnet and threaded-over bonnet.

See threaded end.

See flange. threaded.

a seal using water as a barrier between the packing and the atmosphere.

a design in which the bonnet is mechanically attached to a &, such as by threading, and the joint is seal-welded to prevent leakage (the seal weld shall not be considered to contribute strength to the joint).

a material, such as pipe dope, PTFE tape, or grease, that is applied to valve components to improve the sealing of seats. threads and m. that portion of a & against which the closure member presses to effect shut-off.

See seat ring.

material (usually a resilient material) inserted into the seat face to provide improved sealing.

a separate piece inserted in a valve body to form a seat against which the closure member engages to shut off flow.

the contacting surface of a closure member and a closure.

that effect

a redating valve that is activated by the fluid flowing through the &.

See m. a special shoulder that is cast, welded, or threaded onto a pipe, fitting, or valve end to form a restrained joint when used with the proper gasket and coupling.

See center-Puided check valve.

a brazing process using silver alloys.

a style of wafer valve with a configured to be bolted as a closure member on the end of a pipeline without any additional flange or retaining parts; the holes that mate with the pipeline flanges may be tapped or untapped; the body exterior may be cylindrical like the pipeline flange or may be cut away such that the outside diameter of the pipeline flange occurs only at the bolt-hole locations.

20



3. GLOSSARY

TERMS

socket-welding end:

socket-welding reducing insert:

solder end:

solid-wedge disc valve:

spigot end:

spindle:

spindle bushing:

split wedge:

stem:

stem bushing:

stem nut:

stop check valve:

street ell:

street tee:

stroke:

stuffing box:

stuffing nut:

swing check valve:

tapping sleeve:

DEFINITION

an end connection of a insertion of pipe ends for joining by fillet welding.

or m configured to permit the

a fittinp. with an insertion that reduces a socket-welding end to a smaller pipe size.

the end of a valve or fitting adapted for soldering to pipe or tube.

a pate valve design using a onepiece &c or wedge not designed for flexibility.

See plain end.

see m. See stem nut.

a two-piece wedge used in a gate valve with non-parallel e. a &e component to which motion is impaired outside the assembly to move the closure member inside the valve.

See stem nut.

the part of the effort into thrust on the valve stem.

assembly that converts rotary actuating

a check valve in which the closure member can be mechanically closed.

See elbow. street.

See tee. street.

See travel, rated.

See packing chamber.

See packing nut.

a check valve in which the closure member is mounted so that it opens with presence of flow or pressure and closes with the absence of flow or pressure.

a fitting that can be assembled on an existing main to make a branch or @ connection to the main with a -taming, valve and tavvinp machine,

21



3 . GLOSSARY

TEJRMS

tapping machine:

tapping valve:

tee:

tee, reducing:

tee, straight:

tee, side-outlet:

tee, street:

threaded-in bonnet:

threaded-over bonnet:

threaded end:

three-way valve:

throttling:

thrust collar:

tilting-disc check valve:

tongue-and-grooved joint:

travei, rated:

trim:

True Y:

DEFINITION

a machine used to cut a hole into an existing pressurized or non- pressurized main through the use of a tauDinP sleeve and -

(also called a drilling machine).

a gate valve designed with end connections to provide proper alignment and positioning of a tauuinp sleeve, valve, tapping rnucl,i.i.,e, CE! the v ~ 2 t e ~ ~ ~ y fa: u q p i n g cpe:uticn.

a branched-outlet fittina used to permit straight through and 90" flow.

a tee with unequal pipe size connections.

a tee with all three openings, the run as well as the branch outlet, the same size.

a @ with an additional outlet extending from the side of the fitting at 90" from the plane of the other three.

a tee with external pipe threads on one end of the run.

a bonnet that is threaded into the w. a bonnet into which the bodv is threaded.

an end on a valve, fitting, or pipe that permits parts to be joined by engaging external and internal threads.

a valve with three ports, arranged to control the direction of fiuid flow through the valve and connected piping system.

a reduction of flow through a valve by partial closure of the closure-member.

a device for restraining axial movement of a m. a check valve in which the closure member pivots, but not entirely out of the flow passage.

a joint in which a tongue (a raised annular surface) on one component engages a mating groove in another to assist in mechanical alignment and gasket retention of the assembly.

the amount of linear or rotary movement of the valve stem from the closed position to the fully open position.

functional parts of a refers to the stem, closure member, and seating surfaces.

that are exposed to the line fluid, usually

See wye.



0 3. GLOSSARY TERMS

trunnion ball valve:

tucker connection:

unidirectional valve:

union:

union bonnet:

union cover:

union fitting:

union nut:

union ring:

union, ground-joint:

union, gasket:

v-port plug:

valve:

valve actuator:

valve body:

valve closure-member :

valve plug:

valve seat-port:

DEFINITION

ball valve with a baJl supported by two bearings (trunnion) in the valve body.

a drainage vent fittinn having a threaded joint on one end and a caulked joint on the other end, used to couple a threaded vent pipe to a pipe having a plain or spigot end.

a ya& designed for sealing only in one direction.

a multi-piece fitting that allows the joining or separating of piping without rotating the piping,

a valve bonnet that is fastened to the valve body by means of a union nut.

a cover fastened to the by means of a union nut.

see u-. the threaded ring that joins the & and bonnet or cover of a union bonnet or union cover valve or principal uni> component.

See union nut.

a fittina assembly consisting of a tail or male part, a head or female part, and a union nut (the seating surfaces between head and tail are precision machined to produce a leak-tight joint.

a uni> employing a resilient gasket for sealing.

a type of valve dug or letter Y to provide specific throttling characteristics.

that has an orifice in the shape of the

a device that isolates or controls fluid direction or flow rate (synonymous with stop, e, faucet, tap, bib). See actuator.

see &.

See closure member.

see &.

an opening in a the closure member.

that can be partly or completely blocked by

23



3. GLOSSARY

TERMS DEFINITION

valve stem:

valve stem-extension:

valve stem-thrust:

valve stem-torque:

valve trim:

vane:

wafer valve:

water gage:

wedge:

wedge gate valve:

welded bonnet:

welding end:

wye:

Y:

Y-type valve:

yoke:

yoke bushing:

yoke nut:

yoke sleeve:

see m. means for extending the stern length.

the force required to actuate a linear movement of a valve stem.

a torque required to actuate a rotary movement of the valve stem.

see a. see &.

a valve designed to. be installed between flanges, which has a short face-to-face dimension in relation to the pipeline diameter.

See liauid-level page.

a gate valve closure member with inclined surfaces that mechanically force sealing contact of the gate or &(s) (in double disc valves, the wedpe may act as a spreading device).

a gate valve design in which a wedae-shaped closure member is forced between angled seats to stop flow.

a design in which the bonnet is welded directly to the M .

or fittinn connection end designed for attachment to a pipe or other or fitting by welding.

a three-way fittinp, with a flow passage shaped like the letter Y (sometimes called a true Y or a true wye).

see m, a modified globe valve in which the a t and bonnet are at an angle other than 90 to the flow passage.

that part of a mount the valve actuator.

assembly tised to position the stem nut or to

See stem nut.

See stem nut.

See stem nut.

24



e 4, ABBREVIATIONS

4.1 This section lists abbreviations and their meanings used to describe valves and fitting types, features, and parts.

BB BFV BWE CI CRES CWP DD DI DN DWV ELL F&D FF FLG FO FTTG Fw G HF

IBBM om

IPS ISNRS ISRS MAV MJ MOV NPS NPT

Bolted Bonnet Butterfly Valve Butt-welding End Cast Iron Corrosion-Resistant Steel Cold Working Pressure (Preferred) Double Disc Ductile Iron Diameter Nominal (Metric) Drainage- Waste-Vent Fitting Elbow Faced & Drilled Flange Flat Face Flange Faced Only Fitting Flexible Wedge Gas Hard Faced Handwheel Iron-Body Bronze Mounted (see Bronze Mounted) Iron Pipe Size Inside-Screw, Non-Rising Stem Inside-Screw, Rising Stem Motor-Actuated Valve Mechanical Joint See MAV Nominal Pipe Size National Standard Pipe Thread Taper

NRS OS&Y OWG PN P-T RF RS RTJ S sc SJE ss SWE SWP T TDCV w WOG WSP m Y

Non-Rising Stem Outside Screw & Yoke Oil, Water & Gas (see CWP) Pressure Nominal (Metric) Pressure-Temperature Raised Face Rising Stem Ring-Type Joint Steam Swing Check Valve Solder-Joint End Stainless Steel Socket-Welding End Steam Working Pressure (preferred) Tee Tilting-Disc Check Valve Water Water, Oil, and Gas (see CWP) Working Steam Pressure Working Water Pressure Wye Fitting

25


List of MSS Standard Practices (Price List Available Upon Request)

Standard Finishes for Contact Faces of Pipe Flanges and Connecting-End Flanges of Valves and Fittings Spot Facing for Bronze, Iron and Steel Flanges Standard Marking System For Valves, Fittings, Flanges and Unions Class 150 Corrosion Resistant Gate, Globe, Angle and Check Valves with Flanged and Butt Weld Ends (R 01) Wrought Stainless Steel Butt-welding Fittings (R 01) Steel Pipeline Flanges Bypass and Drain Connections Class 15OLW Corrosion Resistant Cast Flanges and Flanged Fittings Quality Standard for Steel Castings and Forgings for Valves. Flanges and Fittings and Other Piping Componets - Magnetic Particle Examination Method Quality Standard for Steel Castings for Valves, Flanges, and Fittings and Other Piping Components - Radiographic Examination Method Quality Standard for Steel Castings for Valves, Flanges, Fittings, and Other Piping Components - Visual Method for Evaluation Of Surface Irregularities Pipe Hangers and Supports - Materials, Design and Manufacture Connecting Flange Joint Between Tapping Sleeves and Tapping Valves Pressure Testing of Steel Valves High Pressure Chemical Industry Flanges and Threaded Stubs for Use with Lens Gaskets Butteffly Valves High Pressure Buttemy Valves with Offset Oesign Pipe Hangers and Supports - Selection and Application Cast Iron Gate Valves, Flanged and Threaded Ends Gray Iron Swing Check Valves, Flanged and Threaded Ends Ball Valves with Flanged or Butt Welding Ends for General Service (R 96) Brazing Joints for Wrought and Cast Copper Alloy Solder Joint Pressure Fittings Specification for .High Test Wrought Butt Welding Fittings (R 00) Guidelines for Pipe Support Contractual Relationships Cast Iron Plug Valves, Flanged and Threaded Ends Socket-Welding Reducer Inserts Bronze Gate, Globe, Angle and Check Valves Stainless Steel, Bonnetless. Flanged Knife Gate Valves Valve Pressure Testing Methods Class 3000 Steel Pipe Unions, Socket Welding and Threaded Cast Iron Globe 8 Angle Valves, Flanged and Threaded Ends Guidelines for Metric Data in Standards for Valves, Flanges, Fittings and Actuators (R 96) Factory-Made Butt-welding Fittings for Class 1 Nuclear Piping Applications (R 01) Diaphragm Valves Pipe Hangars and Supports - Fabrication and Installation Practices Guidelines on Terminology for Pipe Hangers and Supports (R 96) Guidelines for Manual Operations of Valves MSS Valve User Guide Quality Standard for Steel Castings and Forgings for Valves, Flanges, and Fittings and Other Piping Components-Liquid Penetrant Examination Method Quality Std for Ferritic and Martensitlc Steel Castings for Valves, Flanges, and Fittings and Other Piping Components-Ultrasonic Examination Method Swage(d) Nipples and Bull Plugs Guidelines on Terminology for Valves and Fittings Integrally Reinforced Forged Branch Outlet Fittings-Socket Welding, Threaded, and Buttwelding Ends Protective Coatings for the Interior of Valves, Hydrants, and Fittings (R 01) Instrument Valves Qualification Requirements for Elastomer Diaphragms for Nuclear Diaphragm Type Valves (R 01) Part-Turn Valve Actuator Attachment-Flange and Driving Component Dimensions and Performance Characteristics (R 01) Multi-Turn Valve Actuator Attachment - Flange and Driving Component Dimensions and Perormance Characteristics (R 00) Wrought Copper and Copper Alloy Insert Fittings for Polybutylene Systems Wrought Copper Solder Joint Pressure Fittings (R 01) Instrument Valves for Code Applications (R 96) Cast Copper Alloy Flanges and Flanged Fittings, Class 125, 150 and 300 (R 00) Transition Union Fittings for Joining Metal and Plastic Products Resilient-Seated Cast Iron-Eccentric Plug Valves Welded Fabricated Copper Solder Joint Pressure Fittings Ball Valves Threaded, Socket-Welding, Solder Joint, Grooved and Flared Ends Gray-Iron and Ductile-Iron Tapping Sleeves Quality Standard for Evaluation of Cast Surface Finishes - Visual and Tactile Method. This SP must be sold with a IO-surface, three dimensional Cast Surface Comparator, which is a necessary part of the Standard. Additional Comparators may be sold separately at $25.00 each. Same quantity discounts apply on total order. Connecting Joint between Tapping Machines and Tapping Valves Corrosion Resistant Pipe Fittings Threaded and Socket Welding, Class 150 and 1000 Excess Flow Valves for Natural Gas Service Service Line Valves and Fittings for Drinking Water Systems Bellows Seals for Globe and Gate Valves Compact Steel Globe & Check Valves - Flanged, Flangeless. Threaded & Welding Ends (Chemical & Petroleum Refinery Service) Belled End Socket Welding Fittings, Stainless Steel and Copper Nickel Flexible Graphite Packing System for Rising Stem Steel Valves (Design Requirements) Qualification Testing Methods for Stem Packing for Rising Stem Steel Valves Plastic Industrial Ball Valves Non-Ferrous Threaded and Solder-Joint Unions for Use With Copper Water Tube Fabricated Tapping Sleeves Gray Iron and Ductile Iron In-Line, Spring-Loaded, Center-Guided Check Valves Steel In-Line Spring-Assisted Center Guided Check Valves Bracina for Piping Systems Seismic-Wind-Dynamic Design, Selection, Application

Number SP-c2001 SP-9-2001 SP-25-1998 SP-42-1999 SP-43-1991 SP-44-1996 SP-45-1998 SP-51-2000 SP-53-1999 1

SP-54-1999 SP-55-2001

SP-58-1993 SP-60-1999 SP-61-1999 SP-65-1999 SP-67-1995 SP-68-1997 SP-69-1996 SP-70-1998 SP-71-1997 SP-72-1999 CP-73-1991 SP-75-1998 SP-77- 1995 SP-78-1998 SP-79-1999a SP-80-1997 SP-81-2001 SP-82-1992 SP-83-2001 SP-85-1994 SP-86-1997 SP-87-1991 SP-88-1993 SP-89-1998 SP-90-2000 SP-91-1992 SP-92-1999 SP-93-1999

SP-94-1999

SP-95-2000 SP-96-2001 SP-97-2001 SP-98-2001 SP-99-1994 SP-100-1997 SP-101-1989 SP-102-1989 SP-103-1995 SP-104-1995 SP-105-1996 SP-106-1990 SP-107-1991 SP-108-1996 SP-109-1997 SP-l1C-1996 SP-I 11-2001 SP-112-1999

SP-113-2001 SP-114-2001 SP-115-1999 SP-116-1996 SP-117-1996 SP-118-1996 SP-119-1996 SP-120-1997 SP-121-1997 SP-122-1997 SP-123-1998 SP-124-2001 SP-125-2000 SP-126-2000 SP-127-2001 (R YEAR) Indicates year standard reaffirmed without substantive changes

A large number of former MSS Practices have been approved by the ANSI or ANSI Standards, published by others. In order to maintain a single source of authoritative information, the MSS withdraws its Standard Practice in such cases.

Manufacturers Standardization Society of the Valve and Fittings Industry, Inc. 127 Park Street, N.E., Vienna, VA 22180-4620 (703) 281-6613 Fax# (703) 281-6671


MSS SP-96

Documents

Transcript of MSS SP-96