Cla-Val Pressure Relief Valves:
Waterworks & Fire Protection & Specialty

Waterworks Pressure Relief Valves

Spec & Tech Sheets       

Model # CRL / 55F

Benefits & Features

The Cla-Val Model CRL and 55F Pressure Relief Valves are direct-acting, spring loaded, diaphragm type relief valves. Often used as pilot controls for Cla-Val Hytrol valves, they can also be used as self-contained pressure relief valves. These valves may be installed in any position and open and close within very close pressure limits.

Model # 50-33 / 650-33

Benefits & Features

The Cla-Val 50-33/650-33 Excess Pressure Safety Shut-Off Valve (XPSV) automatically protects the downstream distribution piping and fixtures from experiencing excess unsafe pressures in the event that outlet pressure of the high flow PRV rises above an acceptable level.

Model # 52-01 / 652-01

Benefits & Features

The Cla-Val Model 52-01/652-01 Surge Anticipator Valve is 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 this valve, pumping systems are started and stopped gradually preventing harmful surges from occurring.

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Model # 52-03 / 652-03

Benefits & Features

The Cla-Val Model 52-03/652-03 Surge Anticipator Valve is 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 this valve, pumping systems are started and stopped gradually preventing harmful surges from occurring.

Model # 250-01 / 605-01

Benefits & Features

The Cla-Val Model 250-01/605-01 Differential Pressure Relief Valve is a hydraulically operated, pilot-controlled, modulating valve. It is designed to maintain a constant pressure differential between any two pressure points in a system where the closing of the valve directly causes the differential pressure to increase. The valve tends to open on an increase in differential pressure and close on a decrease in differential pressure. Typical applications include differential pressure control in centrifugal pumping systems and chilled water circulating loop systems.

Model # 58-01 / 658-01

Benefits & Features

The Cla-Val Model 58-01/658-01 valve performs two separate functions. It maintains a constant backpressure by discharging excess pressure downstream and when the solenoid is activated the valve closes drip-tight.

When inlet pressure is greater than the control setting, the valve opens. When inlet pressure is equal to the control setting, the pilot modulates the valve, maintaining the preselected backpressure. When inlet pressure is less than the control setting, the pilot system closes the valve drip tight.

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Model # 550-01 / 6550-01

Benefits & Features

The Cla-Val Model 550-01 Pressure Relief Valve is a hydraulically operated, pilot-controlled, modulating valve designed to maintain constant upstream pressure within close limits. This valve can be used for pressure relief, pressure sustaining, backpressure, or unloading functions in a by-pass system.

Fire Protection Pressure Relief Valves

Spec & Tech Sheets       

Model # 50B-4KG1

Benefits & Features

The Cla-Val Model 50B-4KG1 Globe / 2050B-4KG1 Angle Pressure Relief Valve is designed specifically to automatically relieve excess pressure in fire protection pumping systems. Pilot controlled, it maintains constant system pressure at the pump discharge within very close limits as demands change.

At pump start, Cla-Val Relief Valve modulates to relieve excess pump capacity, maintaining positive system pressure at the pump discharge. When fire demand slows or ceases, Cla-Val Model 50B-4KG1 opens, diverting entire pump output to discharge, allowing fire pump to be stopped without causing surging in the lines.

Model # 50B-4KG1KOL / 2050B-4KG1KOL

Benefits & Features

The Cla-Val Globe Pattern Model 50B-4KG1KOL and Angle Pattern Model 2050B-4KG1KOL relief valve is designed to relieve excess pressure in a fire protection system, while eliminating the damaging effects of cavitation.

The valve features an adjustable pressure setting, fast opening to maintain steady line pressure, and gradual closing for surge free operation.

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Model # 50B-5KG

Benefits & Features

The Model 50B-5KG Pump Suction Control Valve is designed specifically for Fire Pump Suction Control Service. It modulates to maintain the pump discharge in relation to the suction head available, thus assuring that the suction head pressure does not fall below the pre-set minimum. When there is a demand in the Fire System, the pump is started, delivering water from the supply source to the area of demand.

By maintaining minimum pressure requirements in the supply main, the main is protected from possible damage or backflow conditions. Also, a minimum supply pressure is provided for local fire apparatus.

Model # 55L

Benefits & Features

The Cla-Val Model 55L (UL Listed FM approved) Pressure Relief Valve is a direct-acting, spring loaded, diaphragm type relief valve. The valve may be installed in any position and will open and close within very close pressure limits. Using the Model 55L in a fire protection system or other closed type system, prevents pressure build-up whenever line pressure exceeds the setting of the spring. The valve will relieve excess pressure to atmosphere preventing damage to the distribution network.

Model # 55L-60

Benefits & Features

The Cla-Val Model 55L-60 (UL and ULC Listed, FM approved) Pressure Relief Valve is a direct-acting, spring loaded, diaphragm type relief valve. The valve may be installed in any position and will open and close within very close pressure limits. The bottom plug may be removed and installed in the inlet to convert it to an angle pattern flow path.

The Model 55L-60 is typically used in a fire protection system to trim water pressure, thus preventing pressure build-up whenever line pressure exceeds the setting of the spring.

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Model # 750B-4KG

Benefits & Features

The Cla-Val Model 750B-4KG1 Pressure Relief Valve is a hydraulically operated pilot actuated automatic control valve designed specifically to automatically relieve excess pressure in fire protection pumping systems. Pilot controlled, it maintains constant system pressure at the pump discharge within very close limits as demands change. The main valve consists of a stainless steel body and only one moving part, an elastomeric liner or control element.

Model # 850B-4

Benefits & Features

The Cla-Val Model 850B-4 Fire Relief Valve is a pressure-operated, in-line axial valve. A tube diaphragm actuates the valve, which is comprised of three major components: 1) Tube 2) Barrier and 3) Body. There is only one moving part in the valve — the tube diaphragm. There are no shafts, packing, stem guides or springs.

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Specialty Pressure Relief Valves

Spec & Tech Sheets       

Model # 750-01 Pressure Relief, Sustaining and Back Pressure Valve

Benefits & Features

The Cla-Val Model 750-01 Pressure Relief, Sustaining and Back Pressure Valve is a hydraulically operated pilot actuated automatic control valve. The main valve consists of only two parts, a stainless steel body and an elastomeric liner or control element.

Cla-Val Model 750-01 will control from no flow to full open flow without any chattering or slamming under low flow conditions. For this reason, on by-pass, relief, and pressure sustaining service, there is never a region of control instability.