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.
The Cla-Val Model CRL-60 Pressure Relief Valve is a direct-acting, spring-loaded, diaphragm type relief valve. While it can be used as a standalone pressure relief valve, it is often used as a pressure relief pilot control for Cla-Val Hytrol valves. The CRL-60 may be installed in any position and it opens and closes within very close pressure limits