Related Manuals for CSA VRCD
Summary of Contents for CSA VRCD
- Page 1 CSA waterworks line Direct acting downstream pressure reducer-stabilizer Mod. VRCD Rev. 1 – 9/2014...
- Page 2 Direct acting PRV Mod. VRCD Introduction This manual will provide you with the information to properly install and maintain CSA direct acting pressure reducers Mod. VRCD. The contents and the procedure are intended for technicians in charge of CSA valves only, prior to a theoretical and practical training by CSA qualified or authorized personnel.
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Page 3: Table Of Contents
Direct acting PRV Mod. VRCD Contents Description - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 4... -
Page 4: Description
Direct acting PRV Mod. VRCD Description The automatic direct acting PRV Mod. VRCD consists of a upstream pressure balanced single seat globe pattern valve, piston actuated, and equipped with a spring located in the cover to impart the force necessary for the proper working. The operating principle is explained on the technical catalogue, for further explanations please contact us. -
Page 5: Installation
Note to Engineer: The direct acting pressure reducing valve VRCD will regulate and maintain a downstream pressure value according to the force of the spring, located inside the cover, supplied with three different versions to cover : Downstream pressure regulation from 1.5 to 6 bar (blue spring, standard) -
Page 6: Maintenance
VRCD. This could take sometimes minutes, therefore allow for it before acting on the spring. The flow rate is an effect of the pressure reduced by the VRCD for that specific system. A certain outlet pressure value, for an instance 3 bar, wouldn’t produce the same flow rate everywhere as it depends on headloss between the valve itself and the final boundary conditions. -
Page 7: Drawings
Direct acting PRV Mod. VRCD Drawings Picture 1 For further information please consult us at: www.comeval.es... - Page 8 Direct acting PRV Mod. VRCD DESCRIPTION POS. MATERIAL Body GJS 500-7 GJS 500-7 Upper piston S.S. AISI 303 Spring SiCr Upper ring S.S. AISI 304 Nuts S.S. AISI 304 Spring guide Brass/S.S. AISI304 S.S. AISI 304 Driving screw S.S. AISI 304...
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Page 9: Troubleshooting
Direct acting PRV Mod. VRCD Troubleshooting Condition Possible Cause Corrective Action Loose flange bolting. Tighten flange bolting. Valve leaks at flange joint. Blown flange gasket. Replace flange gasket. Miss-alignment or damage Adjust miss-alignment or to field piping and supports. repair piping or supports. -
Page 10: Problem Solving
The valve The spring is corroded and filled Check if the VRCD has been submerged doesn’t open with water, causing the loss of by water, check the spring inside the force... -
Page 11: Disassembly
Direct acting PRV Mod. VRCD 1) Disassembly In order to carry out the proper maintenance of VRCD proceed as follows, ref drawing picture 1 on page 7, for further info consult our technical support : 1. slowly close the upstream and downstream gate valves;... -
Page 12: Reassembly
Direct acting PRV Mod. VRCD 1) Reassembly In order to carry out the proper reassembly of VRCD follow the instruction explained on page 12 in reverse. Pay attention to: 1) use a proper grease on the guiding bush, o-ring, lip gaskets to allow for the proper movement of the mobile block.
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