Floor type hydrostatic pressure relief valve shall be designed for installing in the bottom of concrete tanks. The assembly shall consist of three parts: cover, body and grate. All three parts shall be of cast iron conforming to ASTM specifications A-126 Class B. They shall be designed so that neither the cover or grate can become separated from the body of the valve, due to groundwater pressure around the tank. However, when necessary, both may be easily removed by turning them to right or left to free them from locking lugs cast integrally on the inside of the body.
The seats shall be of EPDM rubber, bonded to the cover, mating with an epoxy coated seat in the body. Floor type pressure relief valves shall be as manufactured by Kennedy Valve or approved equal.
