Spirax Sarco DP17 Installation And Maintenance Instructions Manual
  1. Manuals
  2. Brands
  3. Spirax Sarco Manuals
  4. Control Unit
  5. DP17
  6. Installation and maintenance instructions manual

Spirax Sarco DP17 Installation And Maintenance Instructions Manual

Pilot operated pressure reducing valves
Hide thumbs
Table of Contents

Advertisement

Quick Links

1000026/16
IM-P100-05
CTLS Issue 17
DP17, DP17E, DP17G, DP17R, DP17Y and DP27G
Pilot Operated Pressure Reducing Valves
Installation and Maintenance Instructions
1. Safety information
2. General product
information
3. Installation
4. Commissioning
5. Maintenance
6. Spare parts
7. Fault finding
© Copyright 2018
IM-P100-05 CTLS Issue 17
1
Printed in GB

Advertisement

Table of Contents
loading
Need help?

Need help?

Do you have a question about the DP17 and is the answer not in the manual?

Questions and answers

Subscribe to Our Youtube Channel

Related Manuals for Spirax Sarco DP17

Summary of Contents for Spirax Sarco DP17

  • Page 1 1000026/16 IM-P100-05 CTLS Issue 17 DP17, DP17E, DP17G, DP17R, DP17Y and DP27G Pilot Operated Pressure Reducing Valves Installation and Maintenance Instructions 1. Safety information 2. General product information 3. Installation 4. Commissioning 5. Maintenance 6. Spare parts 7. Fault finding ©...
  • Page 2 IM-P100-05 CTLS Issue 17...

  • Page 3: Safety Information

    Determine the correct installation situation and direction of fluid flow. iv) Spirax Sarco products are not intended to withstand external stresses that may be induced by any system to which they are fitted. It is the responsibility of the installer to consider these stresses and take adequate precautions to minimise them.
  • Page 4 Allow time for temperature to normalise after isolation to avoid danger of burns. 1.9 Tools and consumables Before starting work ensure that you have suitable tools and/or consumables available. Use only genuine Spirax Sarco replacement parts. 1.10 Protective clothing Consider whether you and/or others in the vicinity require any protective clothing to protect against the hazards of, for example, chemicals, high/low temperature, radiation, noise, falling objects, and dangers to eyes and face.

  • Page 5: Residual Hazards

    1.16 Returning products Customers and stockists are reminded that under EC Health, Safety and Environment Law, when returning products to Spirax Sarco they must provide information on any hazards and the precautions to be taken due to contamination residues or mechanical damage which may present a health, safety or environmental risk.

  • Page 6: General Product Information

    These instructions apply to the DP17 and most derivatives including the DP17E, DP17G, DP17R, DP17Y and DP27G. The instructions primarily relate to the use of the DP17 on steam but can be used as a guide when the valve is used on compressed air.

  • Page 7: Pressure/Temperature Limits

    The DP17G and DP27G are limited to 120 °C. Note: DP17, DP17G and DP27G have a variable rate conical pressure adjustable spring fitted providing a downstream pressure range of 0.2 - 17 bar g. DP17Y has a pressure spring with a range of 0.2 - 3 bar g.
  • Page 8 (248 °F) Minimum operating temperature 0 °C (32 °F) Note: For lower operating temperatures consult Spirax Sarco. PMX Maximum differential pressure is limited to the PMO Designed for a maximum cold hydraulic test pressure of: 38 bar g (551 psi g) Note: With internals fitted, test pressure must not exceed: 25 bar g (362.5 psi g)

  • Page 9: Installation

    0.2 - 17 bar (3 - 247 psi). DP17Y (Fig. 1) The DP17Y is supplied as the DP17, but has a lower rate pressure adjustment spring for a downstream pressure range of 0.2 - 3 bar (3 - 44 psi). Pressure setting adjustment screw...
  • Page 10 DP17E The DP17E (Fig. 2) is supplied as for the DP17 with a control spring but the maximum pressure is limited to 10 bar g (145 psi g) due to the addition of the solenoid valve. A solenoid operated valve is fitted in the pipe between the pilot valve and the main diaphragm chamber and is thus in series with the normal pilot valve.
  • Page 11 DP17R The DP17R (see Fig. 3) is supplied ready for fitting. Downstream pressure can be adjusted remotely by a controlled air supply to the pilot diaphragm chamber. The actuating air supply must be at a pressure approximately 0.7 bar g (10 psi g) above the required downstream pressure and controlled through a metal bodied self-relieving regulator.
  • Page 12 See Section 3.6, page 13. chamber Ball valve Downstream isolating valve to provide no-load conditions for Check setting pressure reducing valve Strainer valve DP17 and DP17E Float type steam trap Float type Ball valve steam trap Alternative for draining separator Strainer Sight glass...

  • Page 13: Isolating Valves

    Fig. 5 Two pressure reducing valves in parallel Steam supply ] See Section 3.6 3.3 Pipeline sizing The piping on both sides of the valve must be sized so that velocities do not exceed 30 m/s (98 ft/s). This means that a properly sized valve will often be smaller than the connecting pipework.

  • Page 14: Pressure Gauges

    1 m (3 ft) or 15 pipe diameters whichever is the greater. It should be arranged with a positive fall so that any condensate can drain away from the DP17. Where the size of the reduced pressure main makes it difficult to maintain a fall when entering the top of the main, the pressure control pipe may be connected in the side of the main.

  • Page 15: Safety Valve

    Where a safety valve (C) is required to protect the system downstream of a DP17 and where a control valve is also being used downstream of the DP17, it is recommended that the safety valve is fitted downstream of the control valve rather than in between the DP17 and the control valve.

  • Page 16: Setting Procedure

    (Fig. 8 and Fig. 9) 1. Ensure that all connections are properly made and that all valves are closed. DP17R (Fig. 9) DP17, DP17E, DP17G, DP17Y and DP27G (Fig. 8) 2. Close all valves at reducing 2. Close all valves at reducing valve station, valve station, including the valve including valves on bypass line if fitted.
  • Page 17 2, 9 2, 6 Steam flow ] See Section 3.6 page 13 Condensate return Fig. 8 Setting procedure sequence DP17, DP17E, DP17G, DP17Y and DP27G Optional bypass line (see Section 3.10) 2, 9 3, 7, 8 2, 6 Steam flow...

  • Page 18: Routine Maintenance

    Note: Before actioning any maintenance programme observe the 'Safety information' in Section 1. Warning: The body gasket (all DP17 derivatives) and actuating chamber gasket (DP17R) contains a thin stainless steel support ring which may cause physical injury if not handled and disposed of correctly.
  • Page 19 1. Release the lock-nut. 2. Turn the adjustment screw anticlockwise. Ensure there is no compression on the pressure adjustment spring. 3. For the DP17 and derivatives only - Slide out the 'C-shape' washer. 4. Remove the cover. 5. For the DP17 - Remove the pressure adjustment spring and top plate.
  • Page 20 18. Refit the two diaphragms making sure that they are fitted the same way round as they were removed and that all contact faces are clean. Diaphragms showing signs of wear or damage should be replaced. 19. DP17, DP17E, DP17G, DP17Y and DP27G Replace bottom spring plate. IM-P100-05 CTLS Issue 17...
  • Page 21 20. DP17, DP17E, DP17G, DP17Y and DP27G Assemble the spring housing and tighten the nuts to the recommended torques shown in Table 1, page 21. DP17R Assemble the air control block and tighten the nuts to the recommended torques shown in Table 1, page 21.
  • Page 22 To clean the strainer screen DP17 shown DP17, DP17E, DP17G, DP17Y and DP27G Isolate the pressure reducing valve and zero the pressure. Follow Steps 1 to 5 then proceed. DP17R Isolate the actuating air supply and zero the pressure. 22. Unscrew the unions and release the pipework.
  • Page 23 Follow Steps 1 to 5 then proceed. DP17R Isolate the actuating air supply and zero the pressure. 32. DP17, DP17E, DP17G, DP17Y and DP27G Unscrew the spring housing nuts and remove the spring housing, bottom spring plate and old diaphragms.
  • Page 24 Steps as are necessary in Section 4, page 16. To service or renew the main valve and seat DP17, DP17E, DP17G , DP17Y and DP27G Isolate the pressure reducing valve and zero the pressure. Follow Steps 1 to 5 then proceed.
  • Page 25 DP17R Remove the pilot valve housing, complete with the air control block. 47. Remove the main valve, screen and clean. 48. Remove the main valve spring and the main valve head. Clean to remove dirt or scale as is necessary. 49.
  • Page 26 Table 2 Recommended tightening torques for the main seat Size of valve Width across flats Tightening torques ½" and ½" LC 30 mm A/F (External) 110 - 120 N m (81 - 89 lbf ft) DN15 and DN15LC ¾" and DN20 36 mm A/F (External) 140 - 150 N m...
  • Page 27 62. Refit the main valve head. 63. Replace the main valve return spring. 64. Fit a new gasket. 65. Replace the screen. 66. DP17, DP17E, DP17G, DP17Y and DP27G Assemble the pilot valve housing c omplete with the spring housing...

  • Page 28: Coil Replacement

    To service or renew solenoid valve DP17E Depressurize the valve and turn off the electrical power supply. 68. Undo the retaining nut and slip the entire solenoid enclosure off the solenoid base and sub-assembly or plugnut/core tube sub-assembly. 69. Unscrew the bonnet or solenoid base sub-assembly and remove the core spring, core assembly and body gasket.

  • Page 29: Spare Parts

    6. Spare parts Interchangeability of spares The following table shows how in certain sizes some parts are interchangeable. For example in the line headed 'Main diaphragm' the diaphragm used in the screwed valves ½" and ¾" is common to these sizes by the letter 'a', the letter 'c' indicates that one diaphragm is common to the DN40 and DN50 valves.
  • Page 30 Always order spares by using the description given in the column headed 'Available spares' and state the size and type of the pressure reducing valve. Example: 1 - Main valve assembly for a Spirax Sarco 1" DP17 pilot operated pressure reducing valve. IM-P100-05 CTLS Issue 17...
  • Page 31 DP17R DP17 DP27G IM-P100-05 CTLS Issue 17...

  • Page 32: Fault Finding

    7. Fault finding 7.1 Preliminary procedure Before undertaking the following fault finding procedure, ensure that the valve has been isolated and that upstream and downstream pressures are zero. Possible fault checks are given in a logical order below. 7.2 Downstream pressure zero or too low If downstream pressure drops below set pressure or is zero, check the following: 1.
  • Page 33 7.4 Hunting Hunting may coincide with variations in steam load. If this is the case, the following checks should be made before dismantling the valve: 1. Check that the upstream pressure is stable. If the pressure drops during full-load conditions, it is possible that there is a partial blockage upstream, or that the upstream pipework is undersized.
  • Page 34 IM-P100-05 CTLS Issue 17...
  • Page 35 IM-P100-05 CTLS Issue 17...
  • Page 36 IM-P100-05 CTLS Issue 17...

This manual is also suitable for:

Dp17eDp17yDp27gDp17gDp17r

Table of Contents

Save PDF