A plug valve is a valve with a plug body with a pass-through hole for opening and closing. The plug body rotates with the stem to realize the opening and closing action. Since the movement between the sealing surface of the plug valve has a wiping effect, and in full open can completely prevent contact with the flow medium, it can also be used with suspended particles in the medium. Another important feature of the plug valve is its ease of adapting to a multi-channel configuration, so that a valve can have two, three, or even four different passages. This simplifies the design of piping systems, reduces the use of valves, and reduces the number of fittings needed in the equipment. In order to enlarge the application scope of plug valve, many new structures have been developed. Oil lubricated plug valve is an important kind. Special grease is injected from the top of the plug body between the valve body cone hole and plug body to form an oil film to reduce the opening and closing torque, improve the sealing and service life. It has a working pressure up to 64 mpa, a working temperature up to 325 ° c and a diameter up to 600 mm. The passage of the plug valve comes in many forms. The common straight - through formula is mainly used to cut off the fluid. Three-way and four-way plug valves are suitable for fluid reversal.
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