Steel pneumatic valve seal (2)

in order to achieve zero leakage sealing pneumatic valve inside and outside, save energy and protect the environment, improve efficiency, pneumatic valve must have a reliable sealing performance. Pneumatic valve seal and pneumatic valve seat sealing surface between open and close contact, pneumatic valve stem and valve cover sealing in the dry contact, pneumatic valves and pneumatic valve cover gasket between the department contact. Among them, the opening and closing parts and pneumatic seat sealing pneumatic valve leakage, leakage of pneumatic pneumatic valve cover, stem and pneumatic valve stem seal and pneumatic valve body and bonnet seal leakage of the surface of the pneumatic valve leakage. Pneumatic valve leakage, affect the media's ability to cut off the pneumatic valve. Pneumatic valve leakage can cause loss of transmission medium or environment, serious when still can cause major accidents. The phenomenon of pneumatic valves, explosive, toxic or radioactive medium, no leakage is allowed. Pneumatic valve seal pneumatic valve sealing performance measures of quality is an important technical index, steel and steel brake pneumatic valve seal of the development of the relevant provisions of the technical requirements of the national standard. Steel and pneumatic brake pneumatic valve and globe valve valve sealing materials, processing equipment, mold manufacturing, heat treatment, machining, the machining accuracy and geometrical tolerance sealing, and can not meet the design and specific technology directly affect the sealing effect of ( Seal pneumatic valve, as shown in the figure to) 。 According to the provisions of the relevant standards, pneumatic valve should have a cone or spherical sealing seal structure. However, conical or spherical sealing structure of sealing structure relative to the plane also has some disadvantages, such as friction phenomenon, maintenance difficulties, processing production cost is high, the difficulty increases the sealing surface. Rise in the cost of production, the product is lack of competitiveness. At the same time, in the pneumatic valve sealing performance is difficult to meet the standard of technical requirements, often several seal sealing performance test will be deemed to be null and void. Cone and sphere seal pneumatic valve problems and the analysis of the actual working conditions, the performance of the pneumatic valve sealing pneumatic valve in the basic theory in the design of pneumatic valve sealing surface, pneumatic valve stem and valve cover initially by cone sealing surface to improve the shape of a plane contact. Pneumatic valve stem and valve sealing surface contact, generally will not be precision equipment, precision mold and shape and position tolerance, simple structure, easy processing, parts, pneumatic valve seal cover surface, in order to meet the design requirements of the car. After the completion of the stem, the stem head is heated to the quenching temperature, cooling to room temperature, after finish turning can be assembled sealing surface. A pneumatic valve seal test can achieve % percent of pass of life and the pneumatic valves open and close time can use the same grade, but also more convenient maintenance. Stainless steel pneumatic valve stem and pneumatic valve cover material because the same austenitic material commonly, there is a relationship between the contact pressure trend of adhesion, pneumatic valve cover and seal cone form as much as possible. Can fill in a sealed pneumatic valve cover the bottom of the hole drilling hole, the taper and ptfe pneumatic valve stem seal cone seal, the structure is very suitable for the corrosive medium pipe is suitable for application. In the open air valve, opening and closing action project to reach the designated position, so that the seal play its function. But it is worth noting that the strength should be light, moderate, not too big too fast, in order to avoid scratch sealing surface, extended the pneumatic valve sealing, pneumatic valve, prevent leakage effects of life cycle. Practice has proved that in the road, and pneumatic valve seal compared with the plane design, the mechanical processing equipment and process equipment cone sealing requirements in the form of relatively low, whether it is a small operation or production, can achieve reduce the production cost, improve efficiency, the stability of the product quality and guarantee the safe operation of the facilities is of positive significance.