Lubricated plug valve is closed parts (plug) rotated around the Valve body centerline to achieve open and close a valve. Lubricated plug Valve in the pipeline is mainly used for cutting, media distribution and change the flow direction. Lubricated plug valve is the earliest history been used valves. As the structure is simple, open and close quickly (plug quarter-turn will be able to complete the opening and closing movements), convenient operation, fluid resistance, which is still widely used. One, two-pass copper plug
Two-way plug valves are usually used for low pressure copper pipe straight, sealing performance depends entirely on the stopper and the degree of fit between the plug body is good or bad, the compaction is to rely on the sealing surface of the nut to tighten the lower part of the implementation.
Second, the two-pass cast iron plug valves
Two-way cast iron plug valves by the pressure of the medium itself to achieve between the plug and the plug body pressed seal. Plug the head up out of the body, medium to enter through the entrance hole in the bulk of the plug will plug up the compression, such structures are generally used for air medium.
Three, two-pass copper core plug
Two-copper plug is achieved by clamping the plug and filler plug body sealing. Because of filler, so good sealing performance. Usually the plug with packing gland, not out of the plug body, thereby reducing the leakage of a working fluid way. This plug is used extensively for PN