Cone plug valve seal leakage clearance between the deeper earth pressure can be hard to plug seat to adjust. When plug closely contact with the valve body, valve plug still can rotate, or from the seat in front of the rotation comes to rotate for 90, then the pressure into the sealing. 1) Tight pattern cone plug valves. The occasion of 6 mpa. 2) Packing type cone plug valves. As shown in figure 3, As shown in 254. Inner packing type cone plug valve body with packing, by compression packing asked the seal of the plug and body sealing surface. This kind of packing type cone plug Industrial Valves sealing performance is good, a lot of for nominal pressure 1. The occasion of 6 mpa. The body below the screw rise to cooperate to the consistence between the plug and body adjustment. 3) Oil seal type cone plug valves. Oil seal type cone plug valves with forced lubrication, sealing grease oil gun and forced injection plug valve body of oil tank, the plug and body is formed between the sealing surface of a layer of oil film, so as to improve the sealing performance of plug Industrial Valves, open and close the valve and make effort, at the same time can also prevent the sealing surface damage, protect the sealing surface. The composition of the grease used, depending on the nature of the working medium and operating temperature. The cock of the nominal pressure to C1150 ~ C1300 nominal diameter of 15 ~ 300 mm. Widely used in oil and gas transmission pipeline. 4) Pressure balance inverted cone plug valve pressure balance inverted cone plug valve seal between the plug and body, which rely on sealing grease and the pressure of the medium itself. The nominal pressure for C1150 ~ C12500 class, nominal diameter of 15 ~ 900 mm. It is mainly used in oil, natural gas pipeline. 5) Teflon sleeve seal cone plug valves in order to overcome lubrication maintenance problem of cock, developed the taper plug valves. In the valve, the valve plug to enchase rotating within the body of teflon sleeve, teflon sleeve avoids the viscosity of the plug. But due to the sealing area is large and sealing stress, high operating torque is still larger. But on the other hand, due to the sealing area is large, even on the sealing surface has some damage still can prevent leakage. Because of this, this kind of valve is strong and durable. Due to the use of teflon sleeve, also can make the valve with those in other places will be produced due to contact with each other in the viscosity of valuable materials. In addition, this valve in the field repair, easily plug also need for grinding. 6) Three general formula or four general formula cone plug valves three-pass or more than four general formula taper plug valves for packing type or oil seal type taper plug valves. Mainly for the distribution of medium takes more occasions. 7) High temperature wear resistance of this kind of plug valve plug valve body and bonnet with chromium nickel titanium heat resistant steel, the valve plug made from chromium molybdenum alloy steel, the seat sealing with chromium nickel and titanium carbide surfacing heat resistant steel. Open or closed, first with the lever handle slightly raised the plug, and then rotate the Industrial Valves plug 90 by hand wheel. In order to achieve the purpose of open or close the cock. 6 mpa, nominal diameter of 50 - 1 oomm, working temperature is 580 ℃ or less, suitable medium to heavy oil sand. In this paper, the keyword search: more information supply valve technical articles
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