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SERIES 855 (1400)

IN-LINE FLOW THROTTLING VALVE

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The control of flow within a pipeline can vary from moderately to extremely severe and involves difficulties thatare generally those of obtaining regulation over the major part of the stroke, vibration, cavitation, erosion andscouring. Few of the more common valve designs are capable of fully performing the function

The Series 855 In-Line Flow Throttling Valve consistsof a flanged ductile iron valve body and a verticalsliding cylindrical sleeve. All interior surfaces thatcome in contact with the fluid are fabricated fromstainless steel or bronze. All ductile iron is epoxycoated.

In action, flow takes place radially inwards throughports in an outer fixed cylindrical liner and thenthrough corresponding ports in a similar movableinner sleeve into the interior of the valve. The energyof the jets is dissipated as they impinge againstradially opposite jets. Thus vibration is not transmittedto the valve components.

 Actuation of the valve via fine thread rising screw canbe manual, electric or hydraulic operators. Electricactuators can be supplied for local and remote

control, and to work in conjunction with flow meteringor telemetry equipment.

(In all installations where throttling occurs, dissolvedair may separate out of the water stream due to thereduction of pressure. It is therefore good practice toprovide a small orifice air relief valve a short distancedownstream of the regulating valve.)

The Series 855 (used to be known as series 1400)In-Line Flow Throttling Valve controls flow using theprinciple of throttling across multiple tapered portswhich are positioned around the valve liner. The portshape and arrangement can be designed specificallyfor each application to provide optimum valveperformance and flow control characteristics.

The valve is capable of operating for long periods atany degree of opening over the full length of itsstroke, the shape of the ports in the liner beingdesigned to give flow regulation over the full travel,

without risk of vibration and with complete safety.Droptight closure is not provided, this is effected bythe pipeline isolation valves.

INTRODUCTION

DESIGN

CONSTRUCTION

PERFORMANCE / ENERGY

DISSIPATION

PPLICATION : In Line Flow Throttling

STANDARD SPECIFICATION BODYThe valve body shall be flanged on both theupstream and downstream ends conforming toapplicable standards for bolting into the systemconduit. The body section and flanges shall beductile iron.

 LINERThe fixed liner which contains the ports shall beconstructed using stainless steel. The size andquantity of the ports shall be determined by the flowand pressure requirements to meet the applicationfor which it is intended.

 SLEEVEThe moving sleeve shall be manufactured ofstainless steel or bronze, providing long-life, non-galling operation. To ensure alignment, operation ofsleeve shall be made by means of a shaft with rigidlyattached external and internal guides.

 MATERIALS Body: Ductile Iron BS EN 1563

ENGJS 500-7 Cover: Ductile Iron BS EN 1563

ENGJS 500-7 Ported Liner : Stainless Steel 8.8 Gr. 1.4401(316) Stem : Stainless Steel 8.8 Gr. 1.4401(316) Coating : Internal and external blue (RAL

5005) 2 pack epoxy to WIS 4.52.01Class B with DFT 250 microns

 TESTINGThe valve shall be hydrostatically tested in the openposition at a pressure equal to 1.5 times the workingpressure. The valve shall be cycled from closed toopen three times for operational testing.

 SIZINGThe size of valve is selected from the flows given intable on page 4.

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Features and benefits :

5.Cylindrical Sleeve :Hydraulic BalanceNo Differential LoadsLow Operating Effort 

4/5.Annular Gap :No Wear, No FrictionLower Operating Effort Ideal for Modulation

4/5.Shaped Multiports :Near Linear Characteristic Can be customised Optimum flow change

4/5.Radial Inward Flow :Good Energy DissipationMinimum Wear / ErosionMinimum Cavitation Risk 

FLUID MOVEMENT

11.Fine Screw Thread :Slow Speed OperationFine Adjustment Smooth Flow Transition

11.External Mechanism :Easy To MaintainSimple To LubricatePosition Visible

11.Vertical Motion :Good For ModulationLoad Taken In Gearbox Ideal Alignment 

APPLICATION : In Line Flow Throttling

SLEEVE LINER

(For item number see component list on page 4)

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Valve characteristics

Cavitation guide

 SERIES 855 (1400)Vertical Sleeve Flow Regulating Valve

Valve Headloss Coefficient Versus Valve Port Travel

1

10

100

1000

10000

0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1

Valve Port Travel

   V  a   l  v  e   H  e  a   d   l  o  s  s   C  o  e   f   f   i  c   i  e  n   t   k

2k = 2gh/v

where:-

k = Valve Headloss Coefficient

g = 9.81 m /s2

h = Valve Headloss in m

v = Velocity of flow based on valve nominal bore in m/s

Shut Full

OpenDD1036

Cavitation Guide

Control Valves

(Standard Porting)

0

20

40

60

80

100

120

140

0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30

Outlet Pressure (Metres Head)

   I  n   l  e   t   P  r  e  s  s  u  r  e   (   M  e   t  r  e  s   H  e  a   d   )

DD1261

Cavitation

Zone

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Component List

1. Body

2. Cover 

3. Thrust Tube (F10 top flange)

4. Ported Liner 

5. Ported Sleeve

6. Spindle

7. Bearings

8. Gland

9. Gland Packing

10. O Rings

11. Gearbox/ Actuator (extra)

12. Fasteners

5

89

10

11

12

4

7

6

1

2

3

 A

B C

E

D

DS26/0206

Ref Nos.

855 0200 01000000

DN

200

250

300

350

400

450

500

600

700

800

900

1000

Dimensions (mm)

 A

552

660

762

915

915

990

1220

1372

1525

1525

1830

1830

B

222

267

305

370

370

368

510

534

610

610

686

686

C

330

393

457

545

545

622

710

838

915

915

1144

1144

D

333

349

397

525

525

676

685

838

940

940

1048

1048

E Approx

1090

1140

1190

1250

1250

1600

1680

1705

1810

1915

2025

2025

 Approx.Weight (kg)

212

330

513

885

885

1398

1850

2722

3494

4539

6352

6352

DischargeCapacity l/sec

110

172

250

325

440

555

680

990

1345

1760

2000

2500

855 0250 01000000

855 0300 01000000

855 0350 01000000

855 0400 01000000

855 0450 01000000

855 0500 01000000

855 0600 01000000

855 0700 01000000

855 0800 01000000

855 0900 01000000

855 1000 01000000

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- avkvalves@mweb.co.zaTel +27 44 4951 626 Fax +27 44 4951 310/459

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4.2006 Issue 1