Model # 90-48 / 690-48
Contact Us. About Us. 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. 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. When using this valve, pumping systems are started and stopped gradually preventing harmful surges from occurring.
Model # 50-33 / 650-33
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. 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. The Cla-Val Model 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.
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.
Model # 90-72 / 690-72
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. The valve features an adjustable pressure setting, fast opening to maintain steady line pressure, and gradual closing for surge free operation. 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.
90-01 and 690-01 Pressure Reducing Valve
Also, a minimum supply pressure is provided for local fire apparatus. 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. The bottom plug may be removed and installed in the inlet to convert it to an angle pattern flow path.
The Model 55L 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.
The Cla-Val Model B-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.
Pressure Reducing Valves
The main valve consists of a stainless steel body and only one moving part, an elastomeric liner or control element. 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. The main valve consists of only two parts, a stainless steel body and an elastomeric liner or control element.
Model # CRL / 55F
Cla-Val Model 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. Can't find what you are looking for?
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All names unintentionally excluded from this list will be included in the next revision upon our notification. These valves can be used for pressure relief, pressure sustaining, backpressure, or unloading functions in a by-pass system.
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