An overview and plug valves has simple structure, switch quickly, fluid resistance small, angular travel fast operation. In the accident and other emergency, can quickly connected or cut off the line. Compared with the gate valve, globe valve, flexible operation, switch more quickly. Cock is with hole plug body as the opening and closing, the plug body with the valve rod rotation, in order to realize the opening and closing action. Small without filler plug valve is also called & other; Corker & throughout; 。 Plug valve plug body for cone ( There are also the cylinder) , cooperate with the taper hole surface of the body composition of seal. Second, the soft sealing plug valve soft sealing plug valve is often used in corrosive, high toxic and harmful medium harsh environment, strictly banned leak, and valve material not medium 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 working temperature and medium with F4, F46, PVDF, self-lubricating material such as PP, PO, PE liner, good lubrication, sealing in the whole working process of the pair of small friction coefficient, the plug body flexible operation, long service life. · Body import and export side window design and two-channel grooved ring structure, plug in the process of rotation, the seal between the sealing pressure ratio in the gradual change, until she reached full open or close position, generate enough sealing pressure, seal achieve zero leakage. · Two-channel grooved ring can make solid liner in the body does not produce displacement, and can absorb trace deformation caused by temperature change bushing, between liner and cock at the same time produce strong friction, with automatic cleaning function, improve the service life of the sealing surface. · Piston at the top of the unique design of the lip seal with a soft sealing material film and metal diaphragm and adjusting shim combination can adjust the seal between the sealing surface pressure, flexible to rotate the plug, and can assure you, in the outlet and the seal on flange connection. · Suitable for high scouring of gas-solid, liquid-solid phase medium. Such as PVC, urea, this anhydride, caustic soda production devices, or external leakage demanding medium, such as HF, phosgene, etc. · Medium can be two-way flow, there is no limit on the installation direction, realize the online service, it is more convenient to use. · Unique design can prevent static electricity, fire safety, use safety. Three, oil lubrication oil seal cock valve lubrication hard seal cock valve can be divided into regular lubrication cock valve and pressure balance plug valve. 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, improve the tightness and service life. The working pressure of 64 mpa, the highest working temperature is 325 degrees, maximum diameter is 600 mm. 1, conventional oil lubrication plug valves & middot; Conventional hard seal cock, cock cone installation for a suit. To reduce the number of body and cock sealing surface friction, generally adopts the sealing grease lubrication valve seat seal structure. From the high pressure oil nozzle injection of high pressure oil seal, forming high pressure sealing ring around the cock, between the body and the plug cone sealing surface with a layer of oil film, to sealing and lubrication, easy opening and closing. · In order to further reduce the cock valve opening and closing force, usually adopt the method of reducing plug diameter, so the cock usually adopt rectangular flow channel, the method in reducing plug valve opening and closing torque at the same time, the fluid resistance of plug valve is also increased. · Sealing plug 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 finishing to the mirror, and the valve sealing surface grinding, with lower open-close torque. 2, pressure balance plug valve to reduce the number of conventional hard seal cock valve torque, pressure balance is often used to plug valve. Pressure balance plug valve besides has the characteristics of conventional oil lubricated plug valve, has the following characteristics: & middot; The installation of the pressure balance of the plug valve plug cone method for inversion. The upper portion of the plug cone have a check. The Industrial Valves is closed, because they plug cone area is poor, the injection of high pressure oil seal to plug body up lifting force, make the plug body and valve sealing surface can better sealing. · In instant valve opens, the pressure of the valve body inferior vena and medium pressure balance of the pipeline, high pressure on the chamber sealing oil to plug body downward thrust, and make the plug cone and the valve sealing surface, a tiny gap between rotating body will effectively reduce the torque. Also can protect seal. · Under the condition of high temperature, the thermal expansion of the cock can be absorbed by the elevator, avoid sealing pair of wedge die. Oil lubrication hard seal plug valves, although the lubrication oil can decrease the open-close torque, but likely to medium pollution. So according to actual working condition choose seal oil. Four, ascend plug valve plug valve has a variety of structural form, enhance plug valve according to the materials of sealing surface is divided into soft seal and hard seal two kinds. Its basic principle for open the cock, cock and then rotated 90 degrees to the valve fully open process can reduce the friction with the valve sealing surface; Close the valve when the cock rotate 90 degrees to the closed position come down again after contact with the valve sealing surface to seal. 1, double sealing plug Industrial Valves, double sealing plug Industrial Valves ascension for soft sealing structure. Cock body into three boards combination cylindrical plug body, inlaid rubber sealing surface on both sides of the plate, the middle for cylindrical wedgeplug. Open the valve drive mechanism make the cock up, drive the collapsed on both sides of the board, after making the combination plug body and the valve sealing surface from, causing the body to rotate 90 degrees to the valve fully open position.
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