Forged steel check valve has three valve cover design. The first is a bolt type valve cover design, according to the formal design of the valve, the valve body with the valve cover bolt nut connection, spiral wound gasket (316clip flexible graphite sealing manufacturing ). Customers have special requirements can also be used in metal ring connection. Second kinds of design form is the welding of valve cover, according to the design of the valve, the valve body with the valve cover is connected with the screw threads, all-welded seal. Customers have special requirements can also be welded connection. The third is the pressure of self locking type valve cover design, according to the formal design of the valve, the valve body with the valve cover is connected with the screw threads, pressure from the seal ring seal.

Check the existence of three different design structure, they are lift check valve, ball check valves and swing check valve.