The common problems occurring in the use of pneumatic valve

one, why can't a pneumatic valve, double sealing pneumatic valve as cut off with a two-seater pneumatic valve pneumatic valve, pneumatic valve core has the advantage of force balance structure, allow the pressure difference is big, but its disadvantage is that the two seal face are not good contact, causing leakage. If it is used to cut off at artificially, mandatory, obviously the result is bad, even as it made many improvements ( Such as double seal sleeve pneumatic valve) It is not desirable. Second, why pneumatic valve two-seater small open of the pneumatic valve work easy oscillation for single core, when the medium is away, pneumatic valve stability is good; When the medium is flow closed type, poor stability of pneumatic valve. Two-seater pneumatic valve has two pneumatic valve core, the pneumatic valve core in the flow close, pneumatic valve core in the flow, in this way, when you are working in a small open degree, the flow of the closed type pneumatic valve core is easy to cause the vibration of the pneumatic valve, which is two-seater pneumatic valve can not be used in small open degree of work. Held in three, what straight stroke regulating pneumatic valve performance is poor, held in quarter-turn pneumatic valve performance is good straight travel pneumatic valve pneumatic throttle valve core is vertical, while the medium is horizontal, pneumatic valve cavity flow is bound to turn down turn, make pneumatic valve flow becomes quite complex ( Shapes such as S type) 。 In this way, there is a lot of dead zone, provide the space for medium of precipitation, in the long term, causing congestion. Quarter-turn pneumatic valve throttle direction is horizontal, flow into the medium level, level, easy to take unclean medium, flow simple at the same time, the precipitation of medium space is very few, so held in quarter-turn pneumatic valve performance is good. Four, why quarter-turn kind of pneumatic valve to cut off the pressure difference is bigger? Quarter-turn class of pneumatic valve to cut off the pressure difference is bigger, because the media on the pneumatic valve core or pneumatic valve plate of resultant force on the rotating shaft torque is very small, so it can bear large pressure difference. Five, why the straight stroke regulating pneumatic valve pneumatic valve stem is fine it involves a simple mechanical principle: large sliding friction and rolling friction is small. Straight travel pneumatic valve pneumatic valve rod moves up and down, packing a little pressure, it will be tightly wrapped pneumatic valve stem, produce bigger return difference. Therefore, pneumatic valve stem design very tiny, packing and commonly used small friction coefficient of ptfe packing, in order to reduce the return difference, but the problem is sent pneumatic valve stem thin, easy to bend, pneumatic valve, packing and short service life. Travel the best way to solve this problem, is to use pneumatic valve pneumatic valve stem, namely quarter-turn class regulating pneumatic valve, its pneumatic valve stem ~ times thicker than straight travel pneumatic valve stem, and select long-life graphite packing, pneumatic valve stem good stiffness, packing long life, instead of the friction torque is small, poor little back. Six, why desalting water use line with rubber butterfly pneumatic valve, short service life of lining fluorine pneumatic diaphragm valve? Desalted water medium containing low concentration of acid or alkali, they have larger corrosion in rubber. Rubber corrosion performance for expansion, aging, low intensity, with rubber lining the pneumatic butterfly valve, pneumatic diaphragm valve use effect is the essence of which is the rubber is not caused by corrosion. After the rubber lining pneumatic diaphragm valve to improve the corrosion resistance of good lining fluorine pneumatic diaphragm valve, but lining fluorine pneumatic valve diaphragm and diaphragm are folded up and down and were broken broken, mechanical damage, the service life of pneumatic valve. Now is the best way to deal with water special pneumatic ball valve, it can be used to ~ years. Why to cut off the pneumatic valve should choose as far as possible, hard seal leakage is lower, the better to cut off the pneumatic valve requirements, soft seal leakage of pneumatic valve is the lowest, to cut off the effect of course good, but not wear-resisting, poor reliability of pneumatic valve. From small leakage and sealing and reliable double standards, soft seal cutting is not as good as hard seal cut off. As a fully functional ultra light regulating pneumatic valve, sealing and pile has wear-resisting alloy protection, high reliability, the leakage rate of ~ and have been able to meet the requirements of cut off the pneumatic valve.