The function of the pneumatic valve seal and pneumatic valve 3)

pneumatic valve seal is the function of the pneumatic valve and the importance of quality indicators.
pneumatic valve leakage problem a serious threat to the normal operation, the operation of the pneumatic valve and leaks are difficult to find whether the results of the survey show that a use of various petrochemical pneumatic valves with different degree of leakage problem. Pneumatic valve plate, the reason is that the pneumatic valve seat sealing surface materials do not conform to the requirements, the precision is not enough, pneumatic valve, pneumatic valve plate gate wedge Angle of pneumatic valve does not match the seat sealing surface, the varying widths, consistent, the difference between a door does not reach the designated position, death and other factors.
if the ZY - , seal face material code should be y refers to the hardness of soft sealing materials of sealing surface and the corresponding other sealing materials should be at least on the surface of carbide, and in fact some pneumatic valve sealing surface is only a surfacing welding alloy, and other sealing materials in the body surface of carbon steel, not long after the completion of the project, due to wear and tear of internal leakage occurred phenomenon.
another example for wafer butterfly valve pneumatic valve used in duct system, pneumatic seat sealing material for ptfe. From the point of usage, demand is not high, with temperature and pressure, but found in the clientage pneumatic valve loose a lot of process, severe leakage, so that doesn't work, and had to be replaced pneumatic valve. Remove the inspection found that the pneumatic valve plate big gap with the pneumatic valve seat, and the closed state, even the light. Analysis of the reasons are the following. Pneumatic valve seal manufacture and assembly accuracy of structural design is unreasonable, or do not conform to the requirements, 'does not require the construction and installation of pneumatic valve to bear too much force; # slag in the process of construction, sand, scrap metal and other impurities into the pneumatic valve cavity, seal is affected. In fact, more practical, but also the most fundamental reason is that in the manufacturing, transportation and installation process failed to achieve the standard requirements.