Conical stopcock classification

Leakage between conical stopcock seal pairs can be adjusted by forcing the stopcock deeper into the valve seat. When the valve plug is in intimate contact with the valve body, the valve plug can still be rotated, or it can be lifted 90 ° from the valve seat prior to rotation and then pressed into the seal. 1) tight conical plug valve. Stopcock without packing, the sealing between the valve plug and the valve body sealing surface depends on the nut below the tightening cock to achieve, generally for PN ≤ 0.6MPa occasions. 2) packing cone conical valve. Stuffed conical plug valve body with packing, through the packing to achieve the valve plug and valve body sealing surface of the seal asked. This packing conical plug valve sealing performance is better, a large number of nominal pressure 1.0 ~ 1.6MPa occasions. The screw below the valve body acts as a tight fit between the valve plug and the valve body. 3) Oil-sealed conical plug valve. Because of the use of oil-filled conical plug valve lubrication, the grease gun with grease seal into the valve plug and the valve body of the oil tank, the valve plug and valve sealing surface between the formation of a layer of film, thereby enhancing the sealing performance of the plug valve , And to open and close the valve when the effort, but also to prevent the sealing surface is damaged, play a role in protecting the sealing surface. The composition of the grease used may depend on the nature of the working medium and the operating temperature. This type of plug valve nominal pressure of C1150 ~ C1300 grade, nominal diameter of 15 ~ 300mm. Widely used in oil and gas pipelines. 4) Pressure-balanced inverted conical plug valve Pressure-balanced inverted conical plug valve between the valve plug and valve seal, mainly rely on the sealing grease and the media itself to achieve pressure. The nominal pressure of C1150 ~ C12500 level, nominal diameter of 15 ~ 900mm. Mainly used for oil and gas pipeline. 5) Teflon sleeve sealing conical plug valve In order to overcome the maintenance problems of the lubrication plug valve, conical plug valve was developed. In this valve, the valve plug rotates inside a Teflon sleeve that fits inside the valve body and the Teflon sleeve prevents sticking of the valve plug. However, due to large sealing area and sealing stress, the operating torque is still large. On the other hand, however, due to the large sealing area, leakage can be better prevented even with some damage on the sealing surface. Because of this, the valve is durable. The use of Teflon sleeves also allows the valve to take advantage of valuable materials that stick to each other as they come in contact with each other on other occasions. In addition, the valve is easily repaired in the field and the valve plug does not need to be ground. 6) Three-way or four-way conical plug valves Three-way or four-way conical plug valves are mostly filled or oil-sealed conical plug valves. Mainly used for the distribution of media needs of the occasion. 7) High-temperature wear-resistant plug valve The plug valve body, the valve cover made of chrome nickel titanium heat-resistant steel, the valve plug made of chrome molybdenum alloy steel, the seat ring with chrome nickel titanium heat-resistant steel Made of surfacing cemented carbide. When opening or closing, first lift the valve plug with the lever handle and then rotate the valve plug 90 with the handwheel. , To open or close the plug valve purposes. The nominal valve pressure of 1.6MPa, nominal diameter of 50-1OOmm, the working temperature is ≤ 580 ℃, the medium is sand-containing heavy oil.