WM 351/352 Pressure Regulators for Liquid...

WM 351/352Pressure Regulatorsfor Liquid Adhesives

Manual P/N 315 841 A-- English --

NORDSON WALCOM D UDENHOUT D THE NETHERLANDS

E 1996 Nordson CorporationAll rights reserved

56--WM351--MA--01Issued 04/96

COV_EN_315841A

Order numberP/N = Order number for Nordson products

NoticeThis is a Nordson Corporation publication which is protected by copyright. Original copyright date 1996.

No part of this document may be photocopied, reproduced, or translated to another language without the priorwritten consent of Nordson Corporation. The information contained in this publication is subject to change without

notice.

TrademarksAquaGuard, Blue Box, Control Coat, Equi=Bead, FloMelt, FoamMelt, FoamMix, Helix, Hot Shot, Hot Stitch,

Meltex, MicroSet, MultiScan, Nordson, the Nordson logo, OmniScan, Porous Coat, Posi-Stop, RBX, Sure-Bond,UniScan, UpTime, and Versa-Spray are registered trademarks of Nordson Corporation.

BetterBookSM, CF, Controlled Fiberization, Easy-Screen, Fibermelt, Flo-Tracker, PrintGuard, and Package ofValues are trademarks of Nordson Corporation.

Table of Contents I


WM 351/352Issued 04/96

Manual 56--WM351--MA--01

Table of Contents

Your Safety is Important to Nordson O-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . .

We Welcome Your Suggestions O-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Europe O-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Distributors in Eastern & Southern Europe O-3. . . . . . . . . . . . . . . . . . . . . . .

Outside Europe / Hors d’Europe / Fuera de Europa O-4. . . . . . . . . . . . . . . .

Africa / Middle East O-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Asia / Australia / Latin America O-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Japan O-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

North America O-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

North America / América del Norte O-4. . . . . . . . . . . . . . . . . . . . . . . .

1. Safe Operation 1-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2. Safety Symbols 1-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3. Qualified Personnel 1-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4. Intended Use 1-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

5. Installation and Electrical Connections 1-4. . . . . . . . . . . . . . . . . . . . . . .

6. Operation 1-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Less-obvious Dangers 1-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Action in the Event of System Malfunction 1-5. . . . . . . . . . . . . . . . . .

7. Maintenance / Repair 1-6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

8. Cleaning 1-7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

9. Liquid Adhesives 1-8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Dear Customer

Nordson International

Section 1Safety

Table of ContentsII


WM 351/352Issued 04/96


1. Intended Use 2-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Unintended Use --Examples-- 2-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Safety Instructions 2-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Residual Risks 2-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2. General 2-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3. Principle Functioning 2-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4. Pump with Integrated WM 351/352 (Devices) 2-5. . . . . . . . . . . . . . . . .

Liquid Adhesive Flow 2-6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1. Unpacking 3-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2. Unit Setup 3-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3. Installation Instructions 3-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1. General Adhesive Processing Instructions 4-1. . . . . . . . . . . . . . . . . . . .

2. Compatibility of Different Types of Adhesives 4-1. . . . . . . . . . . . . . . . .

3. Emergency Switch-OFF 4-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4. Initial Setup 4-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

5. Daily Startup 4-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

6. Daily Shutdown 4-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1. Disassembling the Regulator 5-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Disassembling with Solidified Adhesive 5-2. . . . . . . . . . . . . . . . . . . .

2. Assembling the Regulator 5-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3. Cleaning the Regulator 5-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4. Periodic Maintenance 5-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Section 2Description

Section 3Installation

Section 4Operation

Section 5Maintenance

Table of Contents III


WM 351/352Issued 04/96


1. Faults Table 6-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1. Spare Parts / Kits 7-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Spare Parts WM 351/352 7-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Pneumatic Seat Kit 7-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1. WM 351 8-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2. WM 352 8-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3. Characteristics 8-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Section 6Troubleshooting

Section 7Parts

Section 8Specifications

Table of ContentsIV


WM 351/352Issued 04/96


O-1Introduction


56--WM351--MA--01 CONG_EN_B--1294

Dear Customer

Nordson equipment is engineered and manufactured in accordance withstrict specifications, using high-quality components and state-of-the-arttechnologies that assure reliable, long-term performance. Your productwas thoroughly tested for proper operation prior to shipment.

Data and specifications included in this manual are accurate at the timeof publication. Nordson reserves the right to change the contents of thismanual and/or specification without notice.

Carefully read the manual first. It is your guide to safe installation,productive operation and effective maintenance. We recommend that youkeep the manual available for future reference.

Carefully read the Safety instructions. Your product is designed for safeoperation when used according to the published instructions. However,potential hazards exist when instructions -- particularly safety instructions --in this manual and all related documentation are not followed.

If you have any comments or questions concerning Nordson products,spare parts or manuals, do not hesitate to contact Nordson. Foraddresses see Nordson International.

Your Safety is Important toNordson

We Welcome YourSuggestions

O-2 Introduction


56--WM351--MA--01CONG_EN_B--1294

O-3Introduction


56--WM351--MA--01 NI_EN_I--0100

Nordson International

Country Phone Fax

Austria 43-1-707 5521 43-1-707 5517

Belgium 31-13-511 8700 31-13-511 3995

Czech Republic 4205-4159 2411 4205-4124 4971

Denmark 45-4366 0123 45-4364 1101

Finland 358-9-530 8080 358-9-530 80850

France 33-1-6412 1400 33-1-6412 1401

Germany Erkrath 49-211-92050 49-211-254 658

Lüneburg 49-4131-8940 49-4131-894 149

Italy 39-02-904 691 39-02-9078 2485

Netherlands 31-13-511 8700 31-13-511 3995

Norway 47-23-03 6160 47-22-68 3636

Poland 48-22-836 4495 48-22-836 7042

Portugal 351-2-961 9400 351-2-961 9409

Russia 7-812-224 0439 7-812-224 0439

Slovak Republic 4205-4159 2411 4205-4124 4971

Spain 34-96-313 2090 34-96-313 2244

Sweden 46-40-680 1700 46-40-932 882

Switzerland 41-61-411 3838 41-61-411 3818

UnitedKingdom

Hot Melt 44-1844-26 4500 44-1844-21 5358Kingdom

Finishing 44-161-495 4200 44-161-428 6716

SpectralTechnology

44-1753-528 151 44-1753-691 351

Contact: Nordson DED,Germany

49-211-92050 49-211-254652

Europe

Distributors in Eastern &Southern Europe

O-4 Introduction


56--WM351--MA--01NI_EN_I--0100

S For your nearest Nordson office outside Europe, contact the Nordsonoffices below for detailed information.

S Pour toutes informations sur représentations de Nordson dans votrepays, veuillez contacter l’un de bureaux ci-dessous.

S Para obtenir la dirección de la oficina correspondiente, por favordiríjase a unas de las oficinas principales que siguen abajo.

Contact Nordson Phone Fax

DED, Germany 49-211-92050 49-211-254 652

Pacific South Division,USA

1-440-988-9411 1-440-985-3710

Japan 81-3-5762 2700 81-3-5762 2701

Canada 1-905-475 6730 1-905-475 8821

USA Hot Melt 1-770-497 3400 1-770-497 3500

Finishing 1-440-988 9411 1-440-985 1417

Outside Europe /Hors d’Europe /Fuera de Europa

Africa / Middle East

Asia / Australia / Latin America

Japan

North America



Section 1

Safety

Safety1-0



Safety 1-1



Section 1Safety

Safety instructions contained in this section and throughout thisdocument apply to tasks that may be performed with the liquid adhesiveapplication system components and the liquid adhesive used. It is veryimportant that these safety instructions are always followed. Failure to doso could result in personal injury, death and/or damage to the system orother equipment.

With this in mind, here are some basic safety recommendations:

S Read and become familiar with the Safety section prior to installing,operating maintaining or repairing the system.

S Read and follow the warnings which appear within the text and arerelated to specific tasks.

S Store this document within easy reach of personnel operating ormaintaining the system.

S Wear personal protective equipment such as safety goggles, glovesor respiratory equipment where this is required by peculiarities of thesystem and/or the material.

S Familiarize yourself with and follow all safety instructions prescribedby your company, general accident prevention regulations andgovernment safety regulations.

1. Safe Operation

Safety1-2



The following symbols are used to warn against dangers or possiblesources of danger. Become familiar with them! Failure to heed a warningcould lead to personal injury, death and/or damage to the system or otherequipment.

WARNING: Failure to observe may result in personal injury,death, or equipment damage.

WARNING: Risk of electrical shock. Failure to observe mayresult in personal injury, death, or equipment damage.

WARNING: Disconnect equipment from the line voltage.

WARNING: Danger! High pressure. Wear safety goggles whenworking on a liquid adhesive application system.

WARNING: Risk of explosion or fire. Fire, open flames andsmoking prohibited.

WARNING: System and material pressurized. Releasepressure. Failure to observe may result in serious injury.

CAUTION: Failure to observe may result in equipmentdamage.

2. Safety Symbols

Safety 1-3



”Qualified personnel” is defined here as individuals who thoroughlyunderstand the equipment and its safe operation, maintenance andrepair. Qualified personnel are physically capable of performing therequired tasks, familiar with all relevant safety rules and regulations andhave been trained to safely install, operate, maintain and/or repair theequipment. It is the responsibility of the company operating theequipment to see that its personnel meet these requirements.

The system is designed and intended to be used only for the purposedescribed in the Description section. Uses not in accordance with thatsection or as described in this document are considered unintended usesand not in accordance with governing regulations.

WARNING: Use of this equipment in ways other thandescribed in this document may result in personal injury, death,or equipment damage.

The following actions of the owner or operator of the system are some,but not all, examples of unintended use which would permit Nordson toclaim it is not responsible for personal injury or property damage arisingfrom such unintended use:

S Unapproved modifications or changes to the system

S Failure to comply with the safety instructions

S Failure to comply with the instructions concerning installation, use,operation, maintenance or repair, or when these tasks are carried outby unqualified personnel

S Use of inappropriate or incompatible foreign materials or auxiliaryequipment

S Failure to observe workplace safety rules or regulations issued bygovernment authorities or safety councils.

3. Qualified Personnel

4. Intended Use

Safety1-4



S Prior to installation, check intended location and surrounding area forany potential hazards during operation.

S All electrical, pneumatic, gas and hydraulic connections andinstallation of all system components may only be carried out byqualified personnel. Observe installation instructions for componentsand accessories.

S Equipment must be properly grounded and fused according to therated current consumption (see ID plate).

S Cables which run outside the system must regularly be checked forwear or damage.

S Power supply wire gauge and insulation must be sufficient to handlerated current consumption.

S Cables must never be squeezed or pinched. Do not locate cables orhoses in high traffic areas.

S Check liquid adhesive feed hoses, screwed connections andcompressed air lines regularly for leaks. These are to be replaced atthe first signs of cracks, brittleness etc. Release system pressurecompletely beforehand.

WARNING: Failure to install the system properly, and espe-cially failure to ensure electrical, pressurized and high pressurefeed connections are made correctly may result in serious injuryor death.

The system should only be operated when it is in working order. It shouldonly by operated by qualified persons following all regulations valid forliquid adhesive systems.

S Never allow the system to be operated by personnel under theinfluence of substances which reduce their reaction times, or who arenot able to operate the equipment for physical reasons.

S Prior to each startup of the system, check protection and warningdevices and make sure they are fully functional. Do not operate theequipment if these devices are not functioning properly.

S When the removal of safety equipment is required for installation,maintenance or repair, it must be reconnected immediately uponcompletion of the work.

S In a humid environment, only equipment featuring a correspondingclass of protection may be operated.

S Do not operate the system in an explosive environment.

5. Installation and ElectricalConnections

6. Operation

Safety 1-5



S Keep parts of the body and clothing away from rotating parts. Do notwear loose articles of clothing when operating or servicing equipmentwith rotating parts. Remove wrist watches, rings, necklaces or similarjewelry and pin up or cover long hair before performing any work onor with the equipment. The wearing of protective gloves may provehazardous in certain circumstances where rotating parts are presentand may therefore be forbidden.

S To carry out measurements on the substrate or system components,switch off parent machine and/or system and wait until the equipmentcomes to a standstill.

S Never point guns or applicator nozzles at yourself or other persons.

WARNING: An operator or service technician working with theequipment should be aware of the less-obvious dangers thatoften cannot be completely minimized at production sites:

S Pressurized system components

S The possibility that electrical potentials may remain in the systemafter the system was de-energized

S Liquid adhesive vapors

S Hydraulically or pneumatically operated system components

S Uncovered winding parts

If the system malfunctions, switch it off immediately.

S Turn the main switch off, or use emergency stop switch or similarsafety feature as provided.

S After equipment has come to a standstill and before reoperating it,have it repaired by qualified personnel.

6. Operation (contd.)

Less-obvious Dangers

Action in the Event of SystemMalfunction

Safety1-6



Allow only qualified personnel to perform the procedures described in thisdocument. Work should only be carried out on a completelydepressurized system, following all safety procedures.

NOTE: Depending on the configuration of the liquid adhesive applicationsystem, high pressure may remain between application head(s) andpressure regulator or pump/s even after the system has been switchedoff using the main switch or the emergency stop. This especially appliesto multi-hose configurations between pump/s and application head/s.

S Prior to maintenance and repair work it is therefore essential toensure that all liquid adhesive application system components aredepressurized as follows:

1. Release input pressure in front of pump by shutting off customercompressed air supply.

2. Release any remaining system pressure behind the pumps bymanually operating the application heads.

S Secure pneumatically - and hydraulically - operated equipmentagainst uncontrolled movement.

S Switch off system electrically.

WARNING: Some voltage is still present in the control cabineteven after equipment has been turned off at the main switch.Complete the following steps prior to maintenance or repair:

1. Disconnect external power supply.

2. Lock out external power supply.

3. Check no voltage is present.

4. Ground and short.

5. Cover nearby live sections.

If liquid adhesive application system is left idle for extended periods (e.g.overnight or long breaks) Nordson recommends applying Vaseline to theapplication head nozzles to prevent them from drying out and becomingblocked as a result.

S Only use genuine Nordson parts.

7. Maintenance / Repair

Safety 1-7



NOTE: Always refer to the liquid adhesive manufacturer’s MaterialSafety Data Sheet or material information sheet before working with anycleaning fluids.

WARNING: Never clean any aluminium part or flush any sy-stem using halogenated hydrocarbon fluids. Examples of com-mon halogenated hydrocarbons are: dichloromethylene,1,1,1-trichloroethylene and perchlorethylene. Halogenated hy-drocarbons may react violently with aluminium parts.

S Never use an open flame to clean the system or its components.

S Check that (warm) water can be used to clean the liquid adhesivesystem components, possibly with the addition of householdwashing-up liquid. If this is not possible, use only the cleaning fluidstated in the liquid adhesive manufacturer’s information. If themanufacturer recommends heating the cleaner, note the flash point.

S Ensure sufficient room ventilation to draw off vapors.

WARNING: Fire, open flames and smoking are prohibitedwhen cleaning fluids are used. Observe all explosion preventionregulations. Cleaning fluids may only be heated using tempera-ture controlled and explosion-protected heaters.

S Disposal must be according to the waste key in the DIN Safety DataSheet. Liquid adhesives or residue, solvent or separating agents mustnot be released into open waterways. In the case of a leak or spillage,contain liquid and if necessary use an absorbant material e.g.sawdust to soak it up; then proceed according to the relevant wastedisposal regulations.

S If the liquid adhesive application system is to be idle for an extendedperiod, the entire system should be flushed and outlets sealed withVaseline. Warm water is usually used to flush application systemswith which water based liquid adhesives are processed.

S If the liquid adhesive manufacturer specially recommends a flushingagent, the manufacturer’s safety and disposal details must befollowed.

8. Cleaning

Safety1-8



As there is a wide variety of liquid adhesives available with differentcompositions and characteristics, it is impossible here to give anexhaustive list of safety notes reflecting the typical characteristics ofliquid adhesives. The use of liquid adhesives in Nordson’s liquid adhesiveapplication systems therefore requires reference to the liquid adhesivemanufacturer’s documents beforehand.

Information relating to safety aspects e.g. concerning solvent content,hazards and countermeasures in the event of liquid adhesive coming intocontact with skin or mucous membranes are contained in the technicaldata sheets and the DIN Safety Data Sheets from the manufacturer.

NOTE:

S Always refer to the manufacturer’s Material Safety Data Sheet ormaterial information before working with any liquid adhesives.

S It may be necessary to refer to the manufacturer’s notes on the use ofmaterials from a third party. These may be required for processing aliquid adhesive, but hazards arising from their use are not necessarilymentioned by the manufacturer of the liquid adhesive.

S Liquid adhesives may still give off vapors when they are processedcorrectly. The smell produced can cause some annoyance. This isespecially true where liquid adhesives are used that contain solvent,thus requiring the use of breathing equipment e.g. a filter.

S If the prescribed processing conditions are not followed, harmfuldecomposition products may develop. Therefore, the vapors must beremoved.

S Wash hands well before breaks and when work is finished.

S If liquid adhesive comes into contact with eyes or mucousmembranes, rinse well with water - especially the eyes. Changedamp clothes, and seek medical advice if it is swallowed.

S Disposal must be according to the waste key in the DIN Safety DataSheet. Liquid adhesives or residue, solvent or separating agents mustnot be released into open waterways. In the case of a leak or spillage,contain liquid and if necessary use an absorbant material e.g.sawdust to soak it up; then proceed according to the relevant wastedisposal regulations.

S If solvents or separating agents are used to process a liquidadhesive, follow the safety and disposal information from themanufacturer.

9. Liquid Adhesives


WM 351/352Issued 04/96


Section 2

Description

Description2-0


WM 351/352Issued 04/96


Description 2-1


WM 351/352Issued 04/96


Section 2Description

The WM 351/352 series pressure regulators are specially designed forthe application of water based adhesives.

Any other use is considered as not intended and is carried out at theoperator’s own risk. Nordson will not be responsible for personal- orequipment damage resulting from unintended use.

Applying the product for the intended use does also include meeting theoperating, service and maintenance conditions prescribed by themanufacturer.

The product described here is only to be operated, serviced andmaintained by persons who are familiar with the product and potentialhazards of the system’s operation.

The respective rules for prevention of accidents as well as any othercommonly recognised safety regulations and industrial health regulationsare to be observed.

The units may not be used under the following conditions:

S In a defective condition

S In an explosive atmosphere

S Without a reliable air pressure supply control

S In surroundings which do not correspond to the unit’s degree ofprotection

S With unauthorized modifications

1. Intended Use

Unintended Use -Examples-

Description2-2


WM 351/352Issued 04/96


The units may not be used to process the following materials:

S Explosive- and inflammable materials

S Pressure-sensitive materials

S Latex materials

S Food products

Prior to installation and first operation of the machine/unit/system it isnecessary to read and follow the safety instructions.

The general safety instructions are enclosed as an annex to thedocumentation folder or they are a section of this manual.

The specific safety instructions are part of this instruction manual.

For further questions, please contact Nordson.

Nordson is not aware of any residual risks.

There are two versions of the pressure regulators described here:

S WM 351

S WM 352

Both types can easily be mounted to an WM 360 pump.

All wetted surfaces of the pumps are made of stainless tool steel forreducing corrosion or of engineered plastics.

NOTE: The units described in this manual are standard version units-unless otherwise specified. Units with individual equipment can bedifferent in details. However, in such cases, we will make every effort toenclose specific information.

Unintended Use -Examples-(contd.)

Safety Instructions

Residual Risks

2. General

Description 2-3


WM 351/352Issued 04/96


The following figure illustrates the basic operation of a WM 351/352pressure regulator within a complete system.

The transport belt (8) conveys the substrates (7) to which adhesive is tobe applied. As the substrate is conveyed, the leading edge is detected bya photo cell (11) which, in turn, activates the system. The controller (3)starts to run the program according to the set production speed. This isdetermined by an encoder (4) which supplies one pulse per mm. Thecontroller evaluates all the data and establishes the point at which theliquid adhesive guns (5) have to be activated.

The pump (12) is connected to the air supply. The adhesive, which issupplied from the adhesive container (9) is fed through the filter (13) tothe adhesive pressure regulator (10).

A current between 0 and 20 mA is supplied from the controller to theproportional pressure control valve (2) depending on the speed of theproduction machine. This current determines how far the pressure controlvalve (2) opens. Air at a corresponding pressure is supplied to theadhesive pressure regulator (10) and opens its outputs accordingly. Thepattern in which the adhesive is applied is defined by the controller.

3. Principle Functioning

Description2-4


WM 351/352Issued 04/96


WM 351/352-01--A

ElectricCompressed airAdhesive

3

1

2

11

4

9

13

125

6

7

8

10

Fig. 2-1 Principle drawing

1. Compressed air supply2. Proportional pressure control valve3. Controller4. Encoder5. Liquid adhesive gun

6. Adhesive pattern7. Substrate8. Transport belt9. Adhesive container

10. WM 351/352 pressure regulator11. Photo cell12. Air motor13. Filter

3. Principle Functioning(contd.)

Description 2-5


WM 351/352Issued 04/96


The WM 360 container pumps with WM 351/352 adhesive pressureregulator is comprised of 4 assemblies: The air motor (3), the hydraulicassembly (11), the filter assembly (18) and the WM 351/352 adhesivepressure regulator (5).

1

2

14

13

18

3

5

67

4

89

17

10

11

12

16

15

WM 351/352-02--A

Fig. 2-2 Principle drawing

1. Air pressure regulator2. Compressed air connection3. Air motor4. Compressed air input hose5. WM 351/352 pressure regulator6. Hose connection fitting (adhesive out)7. Hose connection fitting (adhesive out)

8. Mounting plate =container lid9. Return tube

10. Adhesive container11. Hydraulic assembly12. Feeding pipe13. Hose connection fitting (adhesive out)

14. Adhesive purge valve15. Hose connection fitting (adhesive out)16. Hose connection fitting (adhesive out)17. Hose connection fitting (adhesive in)18. Filter assembly

4. Pump with IntegratedWM 351/352 (Devices)

Description2-6


WM 351/352Issued 04/96


The liquid adhesive is pumped from the container by the hydraulicassembly (11). It is then pressed through the feeding pipe (12) into thefilter (18). Foreign particles which may be in the adhesive material arefiltered there.

Then the liquid adhesive is fed through the outlet (13, 16) into theWM 351/352 adhesive pressure regulators input hose (17). The air fromthe proportional pressure control valve with more or less pressure opensthe outputs (6 or 7) of the WM 351/352 depending on deliveryrequirements. Then adhesive flows to the liquid adhesive guns.

If the pressure in the output circuit becomes too high (e.g. due to asudden change in line speed) the plunger in the regulator moves up andthe adhesive flows back into the container. This happens via a hole insidethe regulator body and through the return tube (9).

For pressure relief and/or for maintenance (cleaning) the liquid adhesivecan be re-directed with the purge valve (14).

Liquid Adhesive Flow


WM 351/352Issued 04/96


Section 3

Installation

Installation3-0


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Installation 3-1


WM 351/352Issued 04/96


Section 3Installation

WARNING: Allow only qualified personnel to perform thefollowing tasks. Observe and follow the safety instructions inthis document and all other related documentation.

After removing the pressure regulator from the packing materials, inspectit for any damage that may have occured during shipment. TheWM 351/352 pressure regulators are shipped completely preassembledfrom the factory.

NOTE: In order to minimize the pressure drop over the adhesive hoses,they should be kept as short as possible.

NOTE: The liquid adhesive container with the pump and regulator mustbe positioned so that it can be easily accessible for refilling ormaintenance duties.

1. Unpacking

2. Unit Setup

Installation3-2


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The following instructions describe how to install the regulator for mostapplications.

1. Fix the regulator to the container by means of 4 stainless steel screwsM6x12 (4).

2. Remove the protective cap (5) from the hose connection fitting(adhesive in) (6) and from one of the output (2 or 3) hose connectionsof the regulator.

3. Connect the adhesive line to the hose connection fitting (adhesive in)(6) of the regulator.

4. Connect the adhesive line(s) from the gun(s) to the hose connectionfitting (adhesive out) (2 and 3) of the regulator.

5. Connect the control air to the compressed air connection (1) on top ofthe regulator.

52

3

4

6

52

3

4

6

WM351 WM352

1

1

WM 351/352-03--A

Fig. 3-1 WM 351/352

1. Compressed air connection2. Hose connection fitting (adhesive

out)

3. Hose connection fitting (adhesiveout)

4. Screws (M6x12)

5. Protective plug6. Hose connection fitting (adhesive in)

3. Installation Instructions


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Section 4

Operation

Operation4-0


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Operation 4-1


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Section 4Operation


NOTE: The following information is especially important for processingof liquid adhesives, however, they can also be transferred to othermaterials:

S Always pre-test before employing your unit.

S The surface to be bonded should be at room temperature and free ofdust, grease and moisture.

S The suitable material, optimum working conditions, and possiblepre-treatment of the substrate are to be determined by testing.

S Some substrates contain softeners and other components which maybecome volatile later. Sometimes surfaces are treated with wax,lubricants, etc. Without pre-treatment/tests adhesive bonds can faileither immediately or later.

NOTE: Not all types of adhesive are compatible. Degradation of theadhesive followed by function faults and unit damage can be the result ofimproper use of the adhesive.

We are only the supplier of the unit and cannot be liable for damages toequipment if adhesives coalesce due to incorrect handling.

In case of doubt and/or if planning to change the adhesive, pleasecontact the adhesive manufacturer, our head office, or one of ourrepresentatives.

1. General AdhesiveProcessing Instructions

2. Compatibility of DifferentTypes of Adhesives

Operation4-2


WM 351/352Issued 04/96


Make yourself familiar with Emergency Switch-off devices of your LiquidAdhesive Application System.

WARNING: Switch off the system immediately in anyemergency situation.

1. Activate the nearest Emergency-OFF device (e. g. Emergency-OFFbutton or main switch with Emergency-OFF function).

2. After standstill and before switching the unit on again, have themalfunction eliminated by qualified personnel.

Make sure that all installation procedures are done properly.

1. Turn the air pressure knob fully counterclockwise so that for the timebeing no air pressure is applied to the pump.

2. Slightly open the pressure regulator to apply very little air pressure tothe system.

3. Set the initial pump air pressure so that the hydraulic pressure doesnot exceed the pressure range of the regulator (see Specifications).

4. Place a container under the guns or run a test substrate and checkthe bead. If more adhesive is needed, the pump air pressure can beincreased.

NOTE: Do not exceed the pressure range of the regulator. When thehydraulic pressure is too high, the regulator remains closed and noadhesive comes out.

5. Trigger the guns until the adhesive flows smoothly from the guns andthere are no more air bubbles in the adhesive.

CAUTION: Do not exceed the necessary pump pressure. A toohigh increase may have a shearing effect on the adhesivewhich will change its properties.

3. Emergency Switch- OFF

4. Initial Setup

Operation 4-3


WM 351/352Issued 04/96


6. Check all connections for any leakage, tighten the adhesiveconnections if necessary.

NOTE: Output pressure is decreased or increased by minimizing ormaximizing the pressure from the proportional pressure control valve(Changing the current from the Controller).

CAUTION: Due to the design of the filter (with a ball valve)adhesive pressure is not completely relieved only by setting thepneumatic pressure to zero. Make sure that the purge valve isopened for complete adhesive pressure relief. Failure toobserve may allow for unexpected release of pressurizedadhesive.

1. Check the adhesive level in the adhesive container to make sure thatit is not empty.

2. Set the pump air pressure regulator.

1. Reduce the pump pressure to zero at the air pressure regulator.

2. Open the purge valve for a complete adhesive material pressurerelief.

4. Initial Setup (contd.)

5. Daily Startup

6. Daily Shutdown

Operation4-4


WM 351/352Issued 04/96



WM 351/352Issued 04/96


Section 5

Maintenance

Maintenance5-0


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Maintenance 5-1


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Section 5Maintenance


Your WM 351/352 adhesive pressure regulator is easy to maintain andalmost maintenance-free. Under normal operating conditions allcomponents have a long durability.

WARNING: Disconnect power supply!

WARNING: Disconnect adhesive and air supply!

WARNING: Always use protective gloves!

S Make sure that the material to be applied is in clean, filteredcondition. The control air must also be clean.

S Individual operating conditions and different application material mayrequire additional maintenance.

S For outside cleaning procedures, e.g. nozzle tips, never use sharpmetallic tools but rather soft brushes.

S When doing repair or maintenance work keep your working space aswell as the regulator clean as possible.

S Clogged adhesive pressure regulators should be flushed thoroughlywith water.

S In case of major repair work, the adhesive pressure regulator shouldbe removed from the equipment.

S Remove pressure and detach material lines before servicingequipment.

Maintenance5-2


WM 351/352Issued 04/96


WARNING: Disconnect control air.

CAUTION: Be very careful when disassembling individualparts!

To do following procedures please refer to Fig.5-1.

1. Disconnect adhesive and pneumatic lines.

2. Remove the WM 351/352 adhesive pressure regulator from thecontainer by loosening the screws (11).

3. Loosen nut (2) and unscrew the control cylinder (1).

4. Remove screws (3) and take off the top cover (4).

5. Take out the plunger (6). If necessary, push it upwards from thebottom.

6. Take off the O-rings (5 and 7).

CAUTION: Never disassemble the adhesive pressure regulatorif the adhesive inside is solidified! It is highly possible thatsensitive component parts will be damaged.

We recommend to place the regulator - without control cylinder- for oneor two days in warm water so that the adhesive can soften. Repeat thisprocedure several times, if necessary. If it is then still impossible todisassemble the regulator, contact your local Nordson representative.

All O-rings and other sealing elements are of the highest quality. Usingnon approved Nordson components can void the equipment warranty.

After disassembly, check all parts, especially the sealing elements, fordamage or wear.

1. Disassembling theRegulator

Disassembling with SolidifiedAdhesive

Maintenance 5-3


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7

8

9

12

3

2

4

5

6

13

1

WM 351/352-04--A

WM 351WM 352

14

11

1016

15

Fig. 5-1 WM 351/352

1. Control cylinder2. Nut3. Screws (6 x)4. Top cover5. O-ring6. Plunger

7. O-ring8. Regulator body9. Hose connection fitting (3 x)

10. O-ring (3 x)11. Spring washer (4 x)12. Screws (4 x)

13. Return tube14. Manometer15. Reducer16. Quick connector (male)

Maintenance5-4


WM 351/352Issued 04/96


NOTE: When reassembling already used elements, flush the elementswith water so no material residue remains.

CAUTION: The elements must be cleaned of all residueparticles. Failure to do so will cause immediate leakage andmay result in permanent damage to the regulator.

Do not use metallic or sharp tools when assembling O-rings.

Prior to assembly grease the O-rings with a lubricant (silicone grease).

1. Mount O-rings (5 and 7) to the plunger (6).

2. Put the plunger (6) into the regulator body (8).

3. Mount the top cover (4) to the regulator body (8) using the screws (3).

4. Screw the nut (2) to the control cylinder (1).

5. Screw the control cylinder (1) into the top cover (4).

6. Fix the control cylinder (1) to the top cover (4) by means of thenut (2).

Normally regulator cleaning is not required. We recommend to purge thecomplete system with water every 2 months.

We recommend to purge the complete system with water every2 months.

2. Assembling theRegulator

3. Cleaning the Regulator

4. Periodic Maintenance


WM 351/352Issued 04/96


Section 6

Troubleshooting

Troubleshooting6-0


WM 351/352Issued 04/96


Troubleshooting 6-1


WM 351/352Issued 04/96


Section 6Troubleshooting


The troubleshooting tables serve as an orientation for qualifiedpersonnel; however, in respect to the entire liquid adhesive applicationsystem they cannot replace targeted troubleshooting with the help of e.g.wiring diagrams and measuring instruments. They also do not refer to allpossible problems, only to those which most typically occur.

Problem Possible Cause Corrective Action

Regulator does not depositadhesive

Adhesive container empty Refill or change the containeradhesive

Compressed air supply disrupted Check the air pressure on the pumpmanometer and on the air supplynetwork manometer

Compressed air to the pump is too high When the pressure exceeds thepressure range of the regulator theregulator remains closed due to highhydrostatic forces. Lower systempressure and check again

Adhesive leaks from thereturn tube

Adhesive residue inside the regulator;the valve won’t close properly

Flush the regulator with water

Regulator does notrespond to control airpressure changes

Plunger stuck Disassemble regulator and clean withwater

1. Faults Table

Troubleshooting6-2


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WM 351/352Issued 04/96


Section 7

Parts

Parts7-0


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Parts 7-1


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Section 7Parts

NOTE: Defective or worn-out parts must be replaced by original NordsonWALCOM parts. When in doubt contact us. All available spare part kitsare listed in this section.

Parts7-2


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7

8

9

12

3

2

4

5

6

13

1

WM 351/352-04--A

WM 351WM 352

14

11

1016

15

1. Spare Parts / Kits

Parts 7-3


WM 351/352Issued 04/96


Spare Parts

Item Part Description Quantity Note

1 313 458 Control cylinder (WM 351) 1 A

1 313 456 Control cylinder (WM 352) 1 B

2 313 459 Nut (WM 351) 1 A

2 313 457 Nut (WM 352) 1 B

3 311 042 Screws 6

4 313 476 Top cover (WM 351) 1 A

4 313 475 Top cover (WM 352) 1 B

5 313 450 O-ring 1

6 313 474 Plunger 1

7 313 451 O-ring 1

8 313 473 Regulator body 1

9 311 568 Hose connection fitting 3

10 311 496 O-ring 3

11 313 607 Spring washer 4

12 311 051 Screws 4

13 311 673 Return tube 1

14 370 309 Manometer 1

15 313 017 Reducer (WM 351) 1 A

16 311 624 Quick connector (male) (WM 351/352) 1 A, B

NOTE A: WM 351B: WM 352

AR: As Required

Spare Parts WM 351/352

Parts7-4


WM 351/352Issued 04/96


Pneumatic Seal Kit (WM 351/352) P/N 313 344

Item Part Description Quantity Note

5 313 450 O-ring 1 A, B

7 313 451 O-ring 1 A, B

NOTE A: WM 351B: WM 352

AR: As Required

Pneumatic Seal Kit


WM 351/352Issued 04/96


Section 8

Specifications

Specifications8-0


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Specifications 8-1


WM 351/352Issued 04/96


Section 8Specifications

Regulator type WM 351

Height 125 mm (4.92 in)

Diameter 50 mm (1.98 in)

Material Stainless steel and engineeredplastics

Hydraulic input threading 1/4” NPT

Hydraulic output threading 1/4” UNF 20

Return threading 1/4” NPT

Compressed air connectioninput threading

G 1/8” NPT

Maximum input pressure 90 bar (1305 psi)

Pneumatic regulation range 0 - 8 bar (0-116 psi)

Pressure ratioair : adhesive

1 : 0,8

Maximum operating tempe-rature

60 ˚C (140 ˚F )

Relative humidity max. 95%

Noise emission ± 70 dB(A)

Weight 1 kg = 2.2 lbs

NOTE: 1 bar = 14,5 psi

NOTE: 25,4 mm= 1 inch

NOTE: 0,45359237 kg = 1 lbs

NOTE: 9 x ˚C/5 +32 = ˚F

1. WM 351

Specifications8-2


WM 351/352Issued 04/96


Regulator type WM 352

Height 158 mm (6.22 in)

Diameter 78 mm (3.07 in)

Material Stainless steel and engineeredplastics

Hydraulic input threading 1/4” NPT

Hydraulic output threading 1/4” UNF 20

Return threading 1/4” NPT

Compressed air connectioninput threading

G 1/4” NPT

Maximum input pressure 90 bar (1305 psi)

Pneumatic regulation range 0-8 bar (0-116 psi)

Pressure ratioair : adhesive

1:2,4

Maximum operating tempe-rature

60 ˚C (140 ˚F )

Relative humidity max. 95%

Noise emission ± 70 dB(A)

Weight 1,8 kg = 3.97 lbs

NOTE: 1 bar = 14,5 psi

NOTE: 25,4 mm= 1 inch

NOTE: 0,45359237 kg = 1 lbs

NOTE: 9 x ˚C/5 +32 = ˚F

2. WM 352

Specifications 8-3


WM 351/352Issued 04/96


Regulator CharacteristicsWM 351/352

Pre

ssur

era

nge

[0-1

9,2

bar

(0-2

78,4

psi)]

Control pressure [0-8 bar (0-116 psi)]

19,2 bar

WM 352

WM 351WM 351/352-05--A

3

86420

6

9

12

15

18

21

24

6,4 bar

278.4psi

92.8psi

[bar]

[bar]

3. Characteristics

Specifications8-4


WM 351/352Issued 04/96


WM 351/352 Pressure Regulators for Liquid...

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