The plug body of a cylindrical plug valve is a cylinder. This type of plug valve is often sealed by methods such as sealants, O-rings, plug expansion, and eccentric plugs. The sealing of a cylindrical lubricated plug valve relies on the sealant between the plug body and the valve body. The sealant is injected into the sealing surface through the valve stem using a bolt or an injection gun. Therefore, when in use, the lack of sealing can be effectively compensated by injecting additional sealant.
