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Summary of Contents for Spirax Sarco SRV2S
- Page 1 1860050/4 IM-P186-03 CH Issue 4 SRV2S Pressure Reducing Valve Installation and Maintenance Instructions 1. Safety information 2. General product information 3. Installation 4. Maintenance 5. Spare parts 6. Fault finding IM-P186-03 CH Issue 4 Printed in the UK © Copyright 2007...
- Page 2 IM-P186-03 CH Issue 4...
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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 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.
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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
All wetted parts are constructed in 316L stainless steel. SRV2S pressure reducing valves are supplied with one of three colour coded springs which are identified by the disc (18) located on the adjustment handwheel (2): Grey For downstream pressure control: 0.14 to 1.7 bar g... -
Page 7: Pressure /Temperature Limits
Maximum operating temperature 212°C @ 19 bar g (413°F @ 275 psi g) Minimum operating temperature 0°C (32°F) Note: For lower operating temperatures consult Spirax Sarco Maximum downstream reduced pressure 8.6 bar g (125 psi g) Maximum differential pressure 19 bar (275 psi) Maximum recommended turndown ratio 10:1 at maximum flow... -
Page 8: General Installation
(to meet local standards). It should be set to lift below the safe working pressure of the downstream equipment, and will normally be sized to pass the full capacity of the SRV2S should it fail in the fully open position. The safety valve set pressure should take account of its reseat characteristic and the 'No-load' pressure setting of the SRV2S. - Page 9 Under normal flow condition, the reduced pressure setting will fall slightly, but will control under 'dead end' co ons. If required the pressure setting can be increased by readjusting the SRV2S control. There will be a slight increase in set pressure under 'No-load' conditions. 3.3 How to make the SRV2S tamper-proof: When the required set pressure has been achieved, lift out the coloured spring range ID disc (grey, green or orange) from the adjustment handwheel recess.
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Page 10: Maintenance
Refer to Fig 4 (page 7) for view of parts. The valve and valve seat must be kept clean. Any strainer fitted upstream of the SRV2S and strainer screen (15) fitted inside the SRV2S should be cleaned regularly so that the flow to the valve is not restricted. - Page 11 Spring housing hexagon bolts Pressure adjustment spring Bellows assembly Valve and seat assembly Gasket set Fig. 4 IM-P186-03 CH Issue 4...
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Page 12: Spare Parts
Example: 1 off Spirax Sarco pressure adjustment spring, having a downstream pressure range of 3.5 to 8.6 bar g (orange) for a DN15 type SRV2S pressure reducing valve. IM-P186-03 CH Issue 4... - Page 13 Spring housing hexagon bolts Pressure adjustment spring Bellows set Valve and seat assembly Gasket set Fig. 5 IM-P186-03 CH Issue 4...
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Page 14: Fault Finding
6. Fault finding Before investigating any fault ensure that both upstream and downstream isolating valves are shut off and that the SRV2S is vented. Downstream pressure increases above set pressure. SYMPTOM CAUSE 1 Bellows failure or bellows leakage. CHECK and CURE Replace bellows set. - Page 15 IM-P186-03 CH Issue 4...
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