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Item # item-1095, Series 108 Pressure Relief Control Valve

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In many liquid piping systems, it is vital that line pressure is maintained within relatively narrow limits. This is the function of the 108 Pressure Relief / Back Pressure Series of the OCV control valves. Installed in the main flow line. the standard Model 108-2 acts as a back-pressure or pressure sustaining valve. In this configuration, the valve maintains a constant upstream pressure regardless of fluctuating downstream demand. When used in a bypass line, the same model will function as a relief valve, protecting the system against potentially damaging surges.
  • Relief: Maintains a constant inlet pressure by relieving excess high pressure.
  • Sustaining: Prevents pressure from dropping below a minimum.
  • Inlet pressure is accurate over a wide range of flow.
  • Inlet pressure is adjustable with a complete range of control springs.
  • Quick opening with controlled closing.

Specifications  · Approvals


Flange Standard

ANSI B16.42

Flange Class

150 lbs

Flange Face


Maximum Working Pressure

250 psi


Pressure Relief Control






Series-108 Specifications and Dim.
(PDF, 811KB)

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