Plug valve

Plug is closed or plunger type plug valve, the valve by rotating 90 degrees to make fortress of the access point is separated from the body same or spilling, achieve a valve open or closed. Plug of the shape of the plug can be in cylindrical or conical. In the cylindrical plug, the channel is generally rectangular,; In the conical valve plug, the channel into a trapezoid. These shape the structure of the plug valve becomes light, but at the same time also produced a certain loss. Plug as cut off and on the most suitable for medium and diversion, but according to the applicable properties and erosion resistance of sealing surface, sometimes also can be used for throttling.
Plug is a rapid switch plug valve, due to rotating motion with wiping surface, and can completely in the fully open to prevent contact with the liquid medium, so it usually can be used to bring suspended particles of the medium. Plug of another important feature is that it is easy to adapt to multi channel structure, so that a valve can get two, three, even four different port. It can simplify the design of pipe system, reduce the dosage of valve and equipment needed in some of the connection parts.
Ball valve plug body more for the cone, cooperate with the conical hole surface of the body form a seal. Plug valve is to use one of the first valve, simple structure, switch, small fluid resistance rapidly. Ordinary plug rely on highly processed metal plug direct contact between the body and the valve body sealing, so the sealing is poorer, opening and closing force is big, easy to wear.
Soft sealing plug valve commonly used in high corrosive, toxic and harmful medium harsh environment, strictly banned leak, and valve material not medium formation pollution occasion. The body could be selected according to the working medium carbon steel, alloy steel and stainless steel materials. Can be used according to the temperature and the working medium used bushing lubrication materials, good lubrication, sealing pair in the whole working process of the friction coefficient is small, the plug body flexible operation, long service life.
Body design and import and export side window two-channel grooved ring structure, plug in the rotation process, the seal between the sealing pressure ratio in the gradual change, until she reached the fully open or close position, producing enough sealing pressure ratio, sealing deputy achieve zero leakage. Double seal grooves seal ring can make solid liner in the body does not produce displacement, automatic recirculation valve and can absorb trace deformation caused by temperature changing bushing, between liner and plug at the same time produce strong friction, with automatic cleaning function, improve the service life of the sealing surface valve.
Piston at the top of the unique design of the lip seal with a soft sealing materials diaphragm and metal diaphragm and the adjusting shim combination can not only adjust the sealing surface sealing pressure ratio, flexible to rotate the plug, and can ensure that, in the outlet and flange connection end seal. Medium can be two-way flow, with unlimited installation direction, realize the online maintenance, use more convenient. Unique design can prevent static electricity, fire safety, use safety.
Oil lubrication hard seal plug valves can be divided into conventional oil lubricated plug valve and plug valve pressure balance. Special grease injection valve cone hole from the top plug body and the plug body, forming oil film to minimize the valve opening and closing torque and improve the tightness and service life. Its working pressure up to 64 mpa, the highest working temperature can reach 325 degrees, the maximum diameter is 600 mm.
Conventional hard seal plug, plug cone installation for a suit. To reduce the number of body and plug sealing surface friction, generally adopts the sealing grease lubrication valve seat seal structure. In order to further reduce the plug valve opening and closing force, usually adopt the method of reducing plug diameter, so the plug valve usually adopt rectangular flow channel china valve, this approach in reducing plug valve opening and closing torque at the same time, increasing the fluid resistance of the plug. Plug sealing cone STL surfacing alloy material or using surface hardening technology, enhance the wear resistance and corrosion resistance of sealing surface, long service life. Plug cone surface fine grinding to the mirror, and the valve sealing surface grinding, a lower opening and closing torque.