In order to achieve the sealing valve inside and outside of zero leakage, save energy and protect the environment and improve the work efficiency, the valve must have a reliable sealing performance. Sealing parts mainly include the opening and closing of the valve and seat the contact point between the two sealing surface, the stem and bonnet contact point, the valve stem seal, contacts between the valve body and valve cover gasket, etc. Among them, the open-close part with the seat leakage between the two sealing surface is called the internal leakage of the valve, the valve stem and Industrial Valves cover, stem seal and leakage between the body and bonnet seal face called the valve leakage. The valve leak will affect the valve truncation medium capacity. The valve leakage will cause the medium loss or environmental pollution, serious when still can cause major accidents. For flammable and explosive, toxic or radioactive medium, the valve leakage phenomenon is not allowed to happen. The valve seal sealing performance is an important technical index to measure the quality of the valve, the national standard of steel gate and the technical requirements for steel globe valve seal formulated the relevant regulations. Steel gate and globe valves and valve sealing seal material, equipment, tooling manufacture, heat treatment, machining process, tolerance and associated parts machining precision, and other links, one can not meet the design requirements of the technology is directly will affect the sealing effect ( Seal on the valve as shown in figure 1 of 3 ~ 4) 。 According to the provisions of the relevant standards, the valve seal should have conical or spherical sealing structure. However, conical or spherical sealing structure is relatively flat seal structure has certain disadvantages, such as sealing surface friction phenomenon, maintenance difficulties, high processing difficulty, increase the cost of production. As a result, production costs rise, products less competitive. At the same time, the valve on the sealing performance is difficult to reach the technical requirements of the standard, is often in several sealing on the sealing performance test after failure. Aiming at the existing problem of conical and spherical sealing surface and on the basis of the actual working condition of valve performance analysis, in the design of the valve seal adopted cut-off valve disc plane sealing principle, will originally by the conical valve stem and the cover sealing surface improved to plane contact mode. stem and valve cover of plane contact seal generally are not subject to any equipment, precision tooling, matching parts shape and position tolerances of precision, simple structure, easy processing, the cover of the sealing parts just fine car after surfacing can meet the design requirements. After finishing in stem, stem head heating and quenching temperature, air cooling to room temperature, after finish turning sealing plane can be assembled. The qualified rate of the valve seal test can reach 100%, its service life also can achieve the same as the number of the valve opening and closing, and maintenance rise more convenient also. Stainless steel valves due to the valve stem and valve cover material generally austenitic material are all the same, the contact pressure sticking tendency, cover as much as possible, do not use seal on the form of cone. Can work out at the bottom of the Industrial Valves cover packing hole sealing hole, by using the cone on the valve stem and ptfe cone gasket as a seal, this structure is very suitable for application on the road at the pipe of corrosive medium. When open valve opening and closing action should be in place, make the seal play their functions. But it is worth noting that the force should be light and moderate, shoulds not be too fast, in order to avoid scratch sealing surface, to prolong the period of the valve seal, eliminate harm brought by the valve leakage. Practice has proved that the valve seal using graphic design method compared with taper sealing form, the mechanical processing equipment and process equipment requirements are relatively low, whether it is a small job or batch production, can achieve reduce the production cost, improve work efficiency, to stabilize the product quality and guarantee safe operation of the facilities has the positive significance. In this paper, the keyword search: valve supply information
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