Today, the valve industry is increasing the number of new products, how to improve the life of the valve has become more people's attention. In order to solve the "continuation" of the life of the valve seal, the following methods, or to improve the life of the valve sealing life.
Practice has confirmed that the valve on the seal is often only open and close several times, due to the leakage caused by the seal between the deputy. Scratch a little need to open repair, serious damage were scrapped due to damage, the consequences will not only increase the cost of manufacturing enterprises, but also affect the performance of the valve. To solve these problems, the structure and material of the valve are tested and improved.
1. The upper sealing part of the valve stem is moved to the valve flap (the purpose is in the force process, so that the upper sealing cover on the valve cover is in a static non slip state). Although this improvement can be improved on the life of sealing, but due to the need to increase the seal between the valve cover and the valve valve makes the structure more complex, low cost.
2. Change the sealing material. In the stem seal cone surfacing scratch performance of stellite alloy, this method although obtained good results, but on the one hand is due to the high cost of Stellite Alloy and other aspects due to stem the basic material for the 13Cr martensitic stainless steel, welding, surfacing to be preheated before welding, after welding heat preservation Shun welding process is complicated. In addition, in order to ensure the size accuracy of the valve stem, but also increase the rough machining process. Comprehensive analysis, in addition to the special requirements, this program is not good.
Practice shows that the progress of stem cone hardness is a viable way to progress on the valve seal life.
