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Plug valve is shut down or plunger type rotary valve, through 90 degrees the fortress of the valve opening and valve body in the same or separate, spilling opening or closing a valve. The shape of the cock valve plug into a cylindrical or conical. In the cylindrical plug, channel general rectangular; In the tapered plug, channel into a trapezoid. The shape of the structure of the cock become light, but also produced a certain loss. Cock as cut off and on the most suitable for medium and diversion, but according to the applicable properties and erosion resistance of sealing surface differ, sometimes also can be used for throttling. Due to the movement between cock valve sealing surface with wiping, and can completely in the fully open to prevent contact with the liquid medium, so it usually can also be used to take

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