In many liquid piping systems, it is vital that line pressure is maintained within relatively narrow limits. Installed in the main flow line, the standard Mark 5108-2 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.

Features & Benefits
  • 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

Sizes: 1-1/4″ – 24″

Body Materials: Ductile Iron, Cast Steel, Cast Bronze, Stainless Steel

End Connection: Flanged (#150, #300), Screwed, Grooved End

Diaphragm: Buna-N, Viton, EPDM

Max Inlet Pressure: 740 psi (51 bar)

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