Designed to relieve liquid pressure in valves, hoses or piping. The liquid section of all anhydrous systems wherein liquid may be trapped, such as, piping between two shut-off valves, or the transfer hose on loading and on nurse tanks, should be protected with hydrostatic relief valves. Valves are permanently marked with their identifying catalog number, date of manufacture and set pressure.

Hydrostatic relief valves should be replaced 5-years from date of manufacture.