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IM-P204-03

CH Issue 8

4. Maintenance (DN15 to DN32)

Note: Before actioning any maintenance programme observe the 'Safety information'

in Section 1.

Warning

This product should not be dismantled without first releasing the compression on

the control spring.

General information

The valve is maintenance free, but it is recommended that the valve is dismantled every

12 to 18 months for routine inspection of the component parts. Items showing signs of

wear should be replaced.

Details of available spares are given in Section 6.

Prior to routine inspection or fitting spare components, firstly ensure that the DLV is isolated

and that the upstream and downstream pressures are reduced to zero. This is achieved by

rotating the adjustment nut to reduce the spring compression to zero.
The downstream pressure signal pipe should be disconnected from the actuator.

Tools list

Part description

Applicable

range

Tool size

Tool

required

Torque

N m

Actuator location nut

Type 2, 4

and 5

17 A / F

Spanner

15 - 18

Actuator stud

coupling

Type 2, 4

and 5

12 A / F and 14 A / F

Spanner

7 - 9

Pillar nut

DN15 - DN32

19 A / F

Spanner

25 - 32

Adjuster lock-nut

DN15 - DN32

22 A / F

Spanner

Adjuster nut

DN15 - DN32

30 A / F

Spanner

Bellows clamp

DN15 - DN20

15 A / F

Spanner

DN25 - DN32

22 A / F

Spanner

Clamp nut

DN15 - DN20

30 A / F

Spanner

60 - 65

DN25 - DN32

36 A / F

Spanner

60 - 65

Bonnet capscrew M10

DN15 - DN32

8 A / F

Hexagon

key

28 - 32

Head flat

DN15 - DN20

19 A / F

Spanner

15 ±1

Adaptor

DN25 - DN32

24 A / F

Spanner

20 ±2

Содержание DLV7

Страница 1: ...roduct information 3 Installation 4 Maintenance DN15 to DN32 valves 5 Maintenance DN40 to DN100 valves 6 Spare parts Copyright 2016 Printed in GB IM P204 03 CH Issue 8 2046050 8 DLV7 SG Iron Pressure...

Страница 2: ...N25 1 WS4 SEP WS4 3 1 i The products have been specifically designed for use on steam which is in Group 2 of the above mentioned Pressure Equipment Directive The product s use on other fluids may be p...

Страница 3: ...the system or any personnel at risk Dangers might include isolation of vents or protective devices or the rendering ineffective of controls or alarms Ensure isolation valves are turned on and off in a...

Страница 4: ...erating conditions the surface temperature of some products may reach temperatures of 250 C 482 F Many products are not self draining Take due care when dismantling or removing the product from an ins...

Страница 5: ...spring to close or open the valve to adjust the flowrate and maintain a constant downstream pressure The DLV is routine maintenance free It is a single seat bellows sealed valve available in sizes ra...

Страница 6: ...bar g Minimum design temperature 0 C 0 C Maximum operating temperature 250 C 21 8 bar g 250 C 13 9 bar g Minimum operating temperature 0 C 0 C Note For lower operating temperatures consult Spirax Sarc...

Страница 7: ...is available with the following pressure ranges Valve Actuator and Size Pressure range bar Actuator PN rating DLV71 DN100 0 5 1 5 2 5 DLV72 DN15 to DN50 0 2 1 8 2 5 DN65 to DN80 0 4 1 8 DLV73 DN100 1...

Страница 8: ...applications up to a volume of 1 litre WS4 3 The WS4 3 has a larger 3 litre volume and is recommended where there is rapid fluctuation of pressure or load Connection sizes Inlet BSP male Screwed WS4...

Страница 9: ...n temperature 0 C Maximum operating pressure for saturated steam 21 bar g Maximum operating temperature 225 C 21 bar g Minimum operating temperature 0 C Note For lower operating temperatures consult S...

Страница 10: ...valve can alternatively be mounted vertically upwards 1 m or 15 pipe diameters minimum Steam Steam Condensate Fig 5 Typical installation for downstream temperatures above 125 C WS4 water seal pot Stea...

Страница 11: ...lve being put into service Remove the water seal pot filling plug and fully charge the vessel with soft water Replace the filling plug For applications where there are rapid fluctuations in load or pr...

Страница 12: ...t the upstream and downstream pressures are reduced to zero This is achieved by rotating the adjustment nut to reduce the spring compression to zero The downstream pressure signal pipe should be disco...

Страница 13: ...net Using a spanner hold the adjustment nut then loosen the lock nut Loosen the adjustment nut 1 2 3 4 Remove the lock nut Pillar Loosen and remove the pillar securing nuts and washers using a 19 mm A...

Страница 14: ...he lower spring plate 5 6 7 8 Remove the upper spring plate Remove the adjustment nut and thrust washers Loosen and remove the bonnet cap screws using a hexagon key 4 1 Removal of the valve bonnet con...

Страница 15: ...IM P204 03 CH Issue 8 15 9 Lift the bonnet assembly away from the valve body 4 1 Removal of the valve bonnet continued...

Страница 16: ...ng Screw two M14 nuts on to the valve stem and tighten together Note hold nut A Only tighten nut B to ensure no damage to the bellows Seat Gasket surface 1 2 Hold the nut B using a 22 mm A F spanner a...

Страница 17: ...ng the nut B using a 22 mm A F spanner and tighten the head adaptor nut C with a 24 mm A F spanner to a torque of 15 1 N m for the DN15 DN20 and 20 2 N m for the DN25 DN100 Caution to prevent any dama...

Страница 18: ...faces 2 Remove the head set Hold the lock nut B using a 22 mm A F spanner and loosen the head adaptor nut C with a 24 mm A F spanner Caution to prevent any damage care must be taken not to twist the b...

Страница 19: ...DN15 and DN20 sizes and a 36 mm A F spanner for the DN25 and DN32 sizes 6 7 Supporting the bellows assembly proceed to remove the bellows from the bonnet Gasket face Remove and clean gasket material f...

Страница 20: ...ows gasket over the spindle and carefully fitting the bellows into the bonnet Carefully place a new inner bonnet gasket followed by the spindle guide plate Replace the nut and hand tighten Using a 24...

Страница 21: ...5 1 N m for the DN15 DN20 and 20 2 N m for the DN25 DN100 Caution to prevent any damage care must be taken not to twist the bellows To prevent over extension stretching of the bellows locate the guide...

Страница 22: ...7 1 2 3 Fit the screws and leave a small gap Raise and then lower the stem while holding the bonnet firmly to ensure plug and seat alignment Invert the bonnet assembly add the new bonnet gasket on to...

Страница 23: ...ing and actuator assembly 1 2 3 4 Replace the upper spring plate and washers and adjustment nut Screw the adjustment nut down hand tight approximately 20 mm Loosely fit the lock nut onto the spindle R...

Страница 24: ...ng of the spring and actuator assembly continued 6 Re fit the pillar washers and nuts Use a 19 mm A F spanner to tighten the nuts to a torque of 25 32 N m Pillar Lower the actuator holder on to the va...

Страница 25: ...d that the upstream and downstream pressures are reduced to zero This is achieved by rotating the adjustment nut to reduce the spring compression to zero The downstream pressure signal pipe should be...

Страница 26: ...bonnet Using a spanner hold the adjustment nut and loosen the lock nut Remove the lock nut 1 2 3 4 Loosen the adjustment nut Loosen and remove the pillar securing nuts and washers using a 19 mm A F s...

Страница 27: ...move the spring and the lower spring plate Loosen and remove the bonnet cap screws using a 10 mm hexagon key 5 6 Remove the washers and upper spring plate Remove the adjustment nut Adjustment nut Wash...

Страница 28: ...ners hold nut A and tighten nut B 1 2 Although the seat is non replaceable the gasket surface area will need cleaning Hold the lock nut B using a 22 mm A F spanner and loosen the head adaptor nut C wi...

Страница 29: ...the nut B using a 22 mm A F spanner and tighten the head adaptor nut C with a 24 mm A F spanner to a torque of 15 1 N m for the DN15 DN20 and 20 2 N m for the DN25 DN100 Caution to prevent any damage...

Страница 30: ...faces 2 Remove the head set Hold the lock nut B using a 22 mm A F spanner and loosen the head adaptor nut C with a 24 mm A F spanner Caution to prevent any damage care must be taken not to twist the b...

Страница 31: ...to DN100 only 5 Use a small blunt instrument to push the snap ring out of the groove DN65 to DN100 only 6 7 Remove the spindle guide plate DN65 to DN100 only 8 Using a 24 mm A F spanner hold the two...

Страница 32: ...clean Remove the bonnet gasket and clean 5 3 Replacement of the bellows assembly continued 11 9 Support the bellows assembly and remove the lock nut then proceed to remove the bellows DN40 to DN50 bo...

Страница 33: ...the clamp nut Using a 24 mm A F spanner hold the two flat edges on the bellows and then tighten the clamp nut to a torque of 60 65 Nm by using a 36 mm A F spanner 14 Replace guide plate and snap ring...

Страница 34: ...plate and screw the new head set onto the stem hand tight Then proceed to tighten by holding the nut B using a 22 mm A F spanner and tighten the head adaptor nut C with a 24 mm A F spanner to a torqu...

Страница 35: ...following the sequence shown in Figure 7 to a torque of 28 32 N m 1 2 3 Fit the screws and leave a small gap Raise and then lower the stem while holding the bonnet firmly to ensure plug and seat align...

Страница 36: ...ing and actuator assembly 1 2 3 4 Replace the upper spring plate and washers and adjustment nut Screw the adjustment nut down hand tight approximately 20 mm Loosely fit the lock nut onto the spindle R...

Страница 37: ...4 03 CH Issue 8 37 Lower the actuator holder on to the valve and locate the mounting holes 5 6 Re fit the pillar washers and nuts Use a 19 mm A F spanner to tighten the nuts to a torque of 25 32 N m P...

Страница 38: ...65 DN100 snap ring E F G K Control spring s For the Spring setting range see page 39 I Head set DN15 DN100 Head assembly and bonnet gaskets Note The seat cannot be replaced L G F Gasket set Sealing be...

Страница 39: ...F I B C A E D H K DN65 DN100 Spring setting range I 1 DN100 0 5 1 5 bar g 2 DN15 to DN50 0 2 1 8 bar g DN65 to DN80 0 4 1 8 bar g 3 DN100 1 0 4 0 bar g 4 DN15 to DN80 1 0 5 5 bar g DN100 3 5 13 bar g...

Страница 40: ...IM P204 03 CH Issue 8 40...

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