CSA VSM Manual
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CSA VSM Manual

Direct acting upstream pressure relief-sustaining valve
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CSA treated water line
Direct acting upstream pressure
relief-sustaining valve
Mod. VSM

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Summary of Contents for CSA VSM

  • Page 1 CSA treated water line Direct acting upstream pressure relief-sustaining valve Mod. VSM...
  • Page 2 Direct acting PSV Mod. VSM Introduction This manual will provide you with the information to properly install and maintain CSA direct acting pressure relief/sustaining valves Mod. VSM. 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.

  • Page 3: Table Of Contents

    Direct acting PSV Mod. VSM Contents Description - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 4...

  • Page 4: Description

    Direct acting PSV Mod. VSM Description The automatic direct acting PSV Mod. VSM 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 in detail on the technical catalogue, for further explanations please contact us.

  • Page 5: Installation

     Note to Engineer: The direct acting pressure relief/sustaining valve VSM will regulate and maintain an upstream pressure value according to the force of the spring, located inside the cover, supplied with two different range (standard version): Upstream pressure regulation from 1.5 to 6 bar (blue spring, standard)

  • Page 6: Maintenance

    VSM. This could take sometimes minutes, therefore allow for it before acting on the spring. The flow rate is an effect of the pressure controlled by the VSM for that specific system. An inlet pressure value, maintained for an instance at 3 bar, wouldn’t produce the same flow rate everywhere as it depends on the headloss between the valve itself and the final boundary conditions.

  • Page 7: Drawings

    Direct acting PSV Mod. VSM and static (no flow) conditions Drawings Picture 1 Recommended Spare parts nr: 13-21-22-23-24-25-26-27-28-30-32 For further information please consult us at: www.comeval.es...

  • Page 8: Troubleshooting

    Direct acting PSV Mod. VSM Problems solving 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.
  • Page 9 Direct acting PSV Mod. VSM Problems solving Problem Cause Solution There is dirt accumulated between Remove the valve and clean it inside to the obturator and the seat remove dirt The valve doesn’t close The pressure upstream is above Check the pressure and adjust the...

  • Page 10: Disassembly

    7, for further info consult us : 1. slowly close the upstream and downstream gate valves; 2. if the VSM is installed in a location not suitable for maintenance, please remove it from the pipe ; 3. turn the screw (9) anticlockwise to relief the spring (4) 4.
  • Page 11 Direct acting PSV Mod. VSM We reserve the right to incorporate our latest design and material changes without notice or obligation. Design features, materials of construction and dimensional data, as described in this manual, are provided for your information only.

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