By the pneumatic valve seal structure and material of improved experiment is introduced

(1) of the pneumatic valve rod sealing parts on moves to pneumatic valve disc ( Purpose is in the process of loading, the relative pneumatic valve pneumatic disc on the sealing surface sealing surface in the state of static no slip on the cover. The improved though can increase the seal life, but because of increased to a pneumatic valve cover with pneumatic disc sealing structure is relatively complex, price is low. (2) change the seal material. Surfacing on the pneumatic valve stem seal cone abrasion resistance good department too hard alloy, although this method obtains a good effect, but on the one hand, because the company too alloy cost is too high, on the other hand, by the pneumatic valve stem basic materials for Cr martensitic stainless steel, poor weldability, welding preheating before welding, when the complex heat preservation after welding and welding process. In addition, in order to ensure the size precision of the pneumatic valve stem, but also increase the rough machining process. Comprehensive analysis, in addition to the special requirements, which the price is not good. Practice has proved that improve the pneumatic valve stem cone hardness is to improve the feasible methods of globe pneumatic valve seal life.
by the pneumatic valve structure simple, through the principle of pneumatic valve stem rotation and lifting, the pneumatic valve open or truncation, and ensure the pneumatic valve seal and seal function. Due to the special structure of movement principle, also cause stress between the pneumatic valve sealing pair is extremely adverse consequences ( Form both the sealing pair must be vertical pressure, and the relative slip between vice friction sealing. Practice proves that the pneumatic valve's sealing tend to open/close a few times, just because the sealing pair of scratches and cause leakage. Serious to scratch scratch slightly open repair, are scrapped due to damage, so the consequences of not only increases the manufacturing cost, and affect the performance of the pneumatic valve. To solve such problems of pneumatic valve seal structure. And the material tested and improved.