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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 critical of applications including fire pump pressure relief valves, pump suction control valves, deluge valves, pres- sure regulating valves and backflow Flow through the valve responds to changes in downstream demand to maintain a pressure. INSTALLATION. The CRD Pressure Reducing Control may be installed in any The Cla-Val Model 90-01/690-01 Pressure Reducing Valve automatically reduces a higher inlet pressure to a steady lower downstream pressure,. The Cla-Val Model 90-37 Pressure Reducing Valve automatically reduces a higher inlet pressure to a steady lower downstream pressure,. sizes 3 through 24 inch, pressure management controls can also be retrofitted to existing Cla-Val Pressure Reducing. Valves without removal of the valve or maintains a minimum preset (Pressure Relief Control) inlet pressure regardless of changing flow rate. The CLA-VAL SERIES 50 Relief Valve opens fast to. The Cla-Val Model 50B4KG-1 Globe /2050B-4KG Angle Pressure. Relief Valve is designed specifically to automatically relieve excess pressure in firePressure Reducing Stations. Design, Maintenance & Troubleshooting Most Important – Getting the PRV Station You Want! Retrofits to Existing Cla-Val. The Cla-Val Model 50-01 Pressure Relief Valve is actuated by line pressure through a pilot control system, opening fast to maintain steady line pressure but