body and cock has a groove between the sealing surface, sealing grease injection, enhance the sealing performance, can bear high pressure, PN16～320） , often used in gas pipeline of arterial bypass and drain and vent system. Because of its characteristics of reducing plug hole can't meet the main pipeline pigging and inner inspection pig and the detector by requiring, so cannot be used for main line truncation ( Figure 2 - 46) 。

lift. Plug valves at the top of hoisting mechanism, before turn the cock, first the handwheel counterclockwise cock and body seal face off, and then use the handle to cock 90 & deg anticlockwise; That cock channel and pipeline through. Realize the Industrial Valves opens, on the contrary, the cock with handle clockwise 90 & deg; , make cock channel and channel vertical pipeline, and then by rotating the handwheel clockwise, make cock valve sealing surface was associated with a decrease in joint, close the valve. The structure of the cock valve opening and closing torque is small, less wear of sealing surface, long service life, can be used in high temperature working condition, the delayed coking unit in petrochemical industry, the partition, extraction, oil and gas partition, furnace exit, emptying the application several places a lot ( Figure 2 - 47) 。

liner or liner cock, cock is cylindrical or conical, all or part of the lining soft lining material ( Plastic, fluorine plastic) 。 This kind of lining valves in the valve manual & ndash; — Have a detailed selection '.

anti-static devices owing to the seat and packing with PTFE the polymeric material and the plug with stem of circuit insulation between the body, can't conduction. In this case, the valve opening and closing process of the friction will be in the stem of the plug is high enough to cause sparks of static electricity, the more likely when two phase flow. If the medium flows through the valve is flammable, the Industrial Valves must be equipped with anti-static devices, can use cock and circuit conduction stem with the valve body.

refractory plug valves if using a flammable medium structure, then all the valve seals made of polymer even after fully divested basic sealing is required in the fire to medium. Cock refractory quality requirements the same as the ball valve, the ball Industrial Valves section has been expounded.

If you have plenty of time, you can learn how to take care of os&y gate valve. Also, invest in the right cast iron gate valve resilient wedge gate valve.
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