Pressure Relief Valves

Pressure Relief Valves

The 50 Series Pressure Relief Valve is designed to maintain constant upstream pressure within close limits. In operation, the valve is actuated by line pressure through a pilot control system, opening fast to maintain steady line pressure but closing gradually to prevent surges. In addition to surge relief, this valve can be used for pressure relief, pressure sustaining, back pressure, or unloading functions in a by-pass system.

There are many variations on the basic pressure relief valve, including but not limited to the following.

  • 50-01KO Pressure Relief with KO Anti-Cavitation Trim
  • 50-33 Excessive Pressure Safety Shut-Off
  • 52 Series Pressure Relief and Surge Anticipator
  • 550 Series Pressure Relief, Pressure Sustaining
  • 58-01 Combination Back Pressure and Solenoid Shut-Off
  • 350 Series Electronic Pressure Relief

PRODUCTS

Cla-Val Models 50-01 and 650-01 Pressure Relief Valves are hydraulically operated, pilot-controlled, modulating valves designed to maintain constant upstream pressure within close limits. Model 50-01 is the full port version of the valve. Model 650-01 is the reduced port version of the valve. Both are ideal for pressure relief, pressure sustaining, backpressure, or unloading functions in a by-pass system.

Pressure Sustaining Service

When installed in a line between an upper zone and a lower area of heavy demand, the valve acts to maintain desired upstream pressure to prevent “robbing” of the upper zone. Water in excess of pressure setting is allowed to flow to an area of heavy demand, control is smooth, and pressure regulation is positive.

Pressure Relief Service

This fast opening, slow closing relief valve provides system protection against high pressure surges on pump start up and pump shut down by dissipating the excess pressure to a safe location and dissipating the excess pressure to a safe location.

Engineering Data Sheets

The Cla-Val Model 50-01KO Anti-Cavitation Pressure Relief Valve is a hydraulically operated, pilot-controlled, modulating valve designed to maintain constant upstream pressure within close limits. This valve, which is equipped with KO Anti-Cavitation Trim, can be used for pressure relief, pressure sustaining, backpressure, or unloading functions in a by-pass system.

Engineering Data Sheets

Cla-Val Models 52-03 and 652-03 Surge Anticipator Valves are indispensable for protecting pumps, pumping equipment and all applicable pipelines from dangerous pressure surges caused by rapid changes of flow velocity within a pipeline.

When using these valves, pumping systems are started and stopped gradually preventing harmful surges from occurring.

Engineering Data Sheets

652-03 Engineering Data Sheet (Reduced Port)