Forged check valve has three types of body build to connect the design of the form. The first one is the bolt-type valve cover: According to this design the form of the valve design, the valve body and valve cover to connect with bolts nuts, spiral wound gasket (316 folders manufacturing flexible graphite) sealed. Customers also have special requirements can be connected metal rings. The second design is a form of welding-type valve cover, according to this design form of the valve, the valve body and valve cover with threaded connections, all-welded seal. When customers have special requirements may also have recourse through solder connections. The third is the pressure from tight valve cover, according to this design the form of the valve design, the valve body and valve cover with threaded connections, the internal pressure from the sealed Armillariella