With the hole plug body as the opening and closing of the valve. Plug with the valve rod rotation, in order to realize the opening and closing action. Small without filler plug valve is also called a corker. Plug valve plug body for cone ( There are also the cylinder) , cooperate with the taper hole surface of the body composition of seal. Plug Industrial Valves is to use one of the first valve, simple structure, switch quickly, small fluid resistance. Ordinary cock on finishing the direct contact between the metal plug body and the body to seal, so the sealing is poorer, opening and closing force is big, easy to wear and tear, usually can only be used for low ( No more than 1 million mpa) And small diameter ( Less than 100 mm) The occasion. In order to expand the application range of the cock, have developed many new type of structure. Oil lubrication plug valve is one of the most important ( See figure [ Oil lubrication cock] ） 。 Special grease from the top of the plug body between the taper hole injection valve body and the plug body, forming oil film to reduce the open-close torque, improve the tightness and service life. Its working pressure of up to 64 million mpa, the highest working temperature is 325 ℃, the maximum diameter is 600 mm. Cock channel has a variety of forms. Common straight-through type is mainly used for cutting fluid. Three and four general formula plug valve is suitable for the fluid directional control plug valve opening and closing is a hole in the cylinder, perpendicular to the axis of rotation of the channel, so as to achieve the aim of opening and closing the channel. Plug valve is mainly be used for opening and closing medium pipeline and equipment. Plug valves main advantages as follows: 1, suitable for operation, often open/close quickly, light. 2, small fluid resistance. 3, simple structure, relatively small size, light weight, easy to maintenance. 4, sealed performance is good 5, not limited by the installation direction, the flow of medium can be arbitrary. 6, no vibration, low noise. Plug valves can be divided into the form of the structure pattern plug valves, sealing plug valves, filler plug valve and oil plug valve. Points, the form of the channel can be divided into straight-through, three general formula, and the four general formula 3 kinds.

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