Spirax Sarco DLV7 Installation And Maintenance Instructions Manual
  1. Manuals
  2. Brands
  3. Spirax Sarco Manuals
  4. Control Unit
  5. DLV7
  6. Installation and maintenance instructions manual
Spirax Sarco DLV7 Installation And Maintenance Instructions Manual

Spirax Sarco DLV7 Installation And Maintenance Instructions Manual

Iron pressure reducing valve
Hide thumbs
Table of Contents

Advertisement

Quick Links

2046050/8
Installation and Maintenance Instructions
IM-P204-03 CH Issue 8
DLV7 SG Iron
Pressure Reducing Valve
IM-P204-03
1. Safety information
2. General product
information
3. Installation
4. Maintenance -
DN15 to DN32 valves
5. Maintenance -
DN40 to DN100 valves
6. Spare parts
© Copyright 2016
CH Issue 8
1
Printed in GB

Advertisement

Table of Contents
loading
Need help?

Need help?

Do you have a question about the DLV7 and is the answer not in the manual?

Questions and answers

Related Manuals for Spirax Sarco DLV7

Summary of Contents for Spirax Sarco DLV7

  • Page 1 IM-P204-03 2046050/8 CH Issue 8 DLV7 SG Iron Pressure Reducing Valve Installation and Maintenance Instructions 1. Safety information 2. General product information 3. Installation 4. Maintenance - DN15 to DN32 valves 5. Maintenance - DN40 to DN100 valves 6. Spare parts ©...

  • Page 2: Safety Information

    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 possible but, if this is contemplated, Spirax Sarco should be contacted to confirm the suitability of the product for the application being considered.
  • Page 3 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 4: 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 5: General Product Information

    2. General product information Note: The DLV is not suitable for liquid applications 2.1 Description The DLV pressure reducing valve is a direct acting self-powered valve of robust construction, designed to operate under arduous conditions - Ideal for steam applications. The valve is controlled by downstream pressure acting directly on the diaphragm to oppose a 'set' spring force.

  • Page 6: Pressure / Temperature Limits

    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 Sarco Maximum differential pressure 16 bar g Designed for a maximum cold hydraulic test pressure of: 24 bar g...

  • Page 7: Available Types

    2.3 Available types: The DLV7 is available with the following pressure ranges: Pressure range Actuator Valve + Actuator and Size (bar) PN rating DLV71 DN100 0.5 - 1.5 DN15 to DN50 0.2 - 1.8 DLV72 DN65 to DN80 0.4 - 1.8...

  • Page 8: Technical Details

    2.4 Water seal pot - WS4 / WS4-3 (optional extra) Technical details The WS4 is for normal applications up to a volume of 1 litre. Available types The WS4-3 has a larger 3 litre volume and is recommended WS4-3 where there is rapid fluctuation of pressure or load. Connection sizes "...
  • Page 9 Maximum operating temperature 225 °C @ 21 bar g Minimum operating temperature 0 °C Note: For lower operating temperatures consult Spirax Sarco Maximum differential pressure 25 bar g Designed for a maximum cold hydraulic test pressure of 40 bar g...

  • Page 10: Installation

    3. Installation Note: Before actioning any installation observe the 'Safety information' in Section 1. 3.1 General information The valve should be installed in a horizontal pipeline. For operating temperatures below 125 °C the valve may be installed either vertically upwards or vertically downwards (see Figure 4).

  • Page 11: Pressure Gauges

    3.4 Removal of condensate For steam installations a separator should be installed on the upstream side of the valve fitted with a suitable steam trap. 3.5 Pressure gauges Flow To assist in commissioning the valve and direction monitoring operating conditions it is essential to fit pressure gauges on both upstream and Increase downstream sides of the valve.

  • Page 12: Tools List

    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.
  • Page 13 4.1 Removal of the valve bonnet Lock-nut Using a spanner, hold the adjustment Loosen the adjustment nut. nut, then loosen the lock-nut. Pillar Loosen and remove the pillar securing Remove the lock-nut. nuts and washers using a 19 mm A / F spanner.
  • Page 14 4.1 Removal of the valve bonnet (continued) Adjustment Upper spring plate Lower spring plate Remove the adjustment nut and thrust Remove the upper spring plate. washers. Remove the adjustment spring and the Loosen and remove the bonnet cap lower spring plate. screws using a hexagon key.
  • Page 15 4.1 Removal of the valve bonnet (continued) Lift the bonnet assembly away from the valve body. IM-P204-03 CH Issue 8...
  • Page 16 4.2 Replacement of the head set Seat Gasket surface Screw two M14 nuts on to the valve Although the seat is non-replaceable stem and tighten together. the gasket surface area will need Note: hold nut A. Only tighten nut B to cleaning.
  • Page 17 Guide plate Gasket surfaces Remove the head set and guide plate. Note: Remove and clean the guide plate and the gasket surfaces and fit new gaskets throughout. Replace the guide 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 torque of 15 ±...
  • Page 18 4.3 Replacement of the bellows assembly Screw two M14 nuts on to the valve stem Hold the lock-nut B using a 22 mm A / F and tighten together. spanner and loosen the head adaptor Note: only tighten nut B to ensure no nut C with a 24 mm A / F spanner.
  • Page 19 Using a 24 mm A / F spanner hold the two Supporting the bellows assembly flat edges on the bellows and then unscrew proceed to remove the bellows from the the clamp nut using a 30 mm A / F spanner bonnet.
  • Page 20 4.3 Replacement of the bellows assembly (continued) Bellows gasket Arrangement of the gaskets for reassembly of the bellows. Ensure that the internal gasket face is clean before placing a new upper bellows gasket over the spindle and carefully fitting the bellows into the bonnet.
  • Page 21 Fit the guide plate and screw the head set onto the stem. Ensure the guide plate locates over the head set. Hand tighten. Replace the guide 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 torque of 15 ±...
  • Page 22 4.4 Re-assembly of the valve bonnet Bonnet gasket Invert the bonnet assembly; add the new bonnet gasket on to the bellows guide plate then lower the valve body Fit the screws and leave a small gap. onto the bonnet. Raise and then lower the stem while Ensure the gaskets are aligned correctly.
  • Page 23 4.5 Refitting of the spring and actuator assembly Replace, the lower spring plate and Replace the upper spring plate and spring. washers and adjustment nut. Lock-nut Screw the adjustment nut down (hand Loosely fit the lock-nut onto the spindle. tight), approximately 20 mm. IM-P204-03 CH Issue 8...
  • Page 24 4.5 Refitting of the spring and actuator assembly (continued) Pillar Lower the actuator holder on to the Re-fit the pillar, washers and nuts. Use valve and locate the mounting holes. a 19 mm A / F spanner to tighten the nuts to a torque of 25 - 32 N m.
  • Page 25 5. Maintenance (DN40 to DN100) 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.
  • Page 26 5.1 Removal of the valve bonnet Lock-nut Using a spanner hold the adjustment nut Loosen the adjustment nut. and loosen the lock-nut. Loosen and remove the pillar securing Remove the lock-nut. nuts and washers using a 19 mm A / F spanner.
  • Page 27 Adjustment Washer Bearing Washer Spring plate Remove the adjustment nut. Remove the washers and upper spring plate. Remove the spring and the lower spring Loosen and remove the bonnet cap plate. screws using a 10 mm hexagon key. IM-P204-03 CH Issue 8...
  • Page 28 5.2 Replacement of the head set Seat Gasket surface Although the seat is non-replaceable, Using two spanners hold nut A and the gasket surface area will need tighten nut B. cleaning. 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.
  • Page 29 Guide plate Gasket surfaces Remove the head set. Carefully screw a new plug onto its spindle - finger tight. Replace the guide 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 torque of 15 ±...
  • Page 30 5.3 Replacement of the bellows assembly Screw two M14 nuts on to the valve stem Hold the lock-nut B using a 22 mm A / F and tighten together. spanner and loosen the head adaptor Note: only tighten nut B to ensure no nut C with a 24 mm A / F spanner.
  • Page 31 Locate the small hole and cover it with Use a small blunt instrument to push the snap ring (DN65 to DN100 only). the snap ring out of the groove (DN65 to DN100 only). Using a 24 mm A / F spanner hold the two Remove the spindle guide plate flat edges on the bellows and then (DN65 to DN100 only).
  • Page 32 5.3 Replacement of the bellows assembly (continued) Support the bellows assembly and Remove the bellows gasket and clean. remove the lock-nut, then proceed to remove the bellows (DN40 to DN50 bonnet shown). Fit new gasket over the new bellows Remove the bonnet gasket and clean. spindle.
  • Page 33 Support the bellows spindle while replacing the clamp nut. Using a 24 mm A / F spanner hold the Carefully refit the bellows into the two flat edges on the bellows and then bonnet. tighten the clamp nut to a torque of 60 - 65 Nm by using a 36 mm A / F spanner.
  • Page 34 5.3 Replacement of the bellows assembly (continued) Carefully screw head set onto spindle until hand tight. Caution: ensure plug adaptor is engaged in the spindle guide plate before tightening fully, otherwise damage to the bellows may occur. Refit two M14 nuts onto the stem and lock together. Replace the guide plate and screw the new head set onto the stem (hand tight).
  • Page 35 5.4 Reassembly of the valve bonnet Bonnet gasket Invert the bonnet assembly; add the new bonnet gasket on to the bellows guide plate then lower the valve body Fit the screws and leave a small gap. onto the bonnet. Raise and then lower the stem while Ensure the gaskets are aligned correctly.
  • Page 36 5.5 Refitting of the spring and actuator assembly Replace, the lower spring plate and Replace the upper spring plate and spring. washers and adjustment nut. Lock-nut Screw the adjustment nut down (hand Loosely fit the lock-nut onto the spindle. tight), approximately 20 mm. IM-P204-03 CH Issue 8...
  • Page 37 Pillar Lower the actuator holder on to the Re-fit the pillar, washers and nuts. Use valve and locate the mounting holes. a 19 mm A / F spanner to tighten the nuts to a torque of 25 - 32 N m. IM-P204-03 CH Issue 8...

  • Page 38: Spare Parts

    Always order spares by using the description given in the column headed 'Available spares' and state the size and type of valve. Example: 1 - Gasket set for a Spirax Sarco DN15 DLV72 pressure reducing valve. Head and seat arrangement...
  • Page 39 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 DN15 to DN80 1.0 - 5.5 bar g DN100...
  • Page 40 IM-P204-03 CH Issue 8...

This manual is also suitable for:

Dlv71Dlv73Dlv72Dlv75Dlv74

Table of Contents