Purpose: Unitest allows to certify plant Safety and Relief Valves , while allowing plant to continue operating under normal conditions , thus eliminating the need to remove these valves for unnecessary overhauling / repairs.

Principle: The principle of operation is to apply force to the valve spindle to overcome the spring tension of the valve , using a hydraulic power pack in conjunction with an electronic force transducer , linked to a digital recorder that controls and records the force applied.

Verification parameters of Safety and Relief valve:

  • – Set pressure
  • – Reseat Pressure
  • – Spring rate
  • – Valve Displacement


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