The nine common problems occurring in the use of pneumatic valve (2)

a, why the work of small open pneumatic valve seat is very easy oscillation
single core, when the medium is away, pneumatic valve stability is good; When the medium is flow closed type, poor stability of pneumatic valve. Have two pneumatic valve core flow pneumatic valve core shut down under the seat, open the pneumatic valve core in the flow, therefore, in the small open, in the closed flow pneumatic valve pneumatic valve core is easy to cause vibration, this is not the cause of the pneumatic valve seat for small open.
2, why can't a double seal pneumatic valve used to cut off the pneumatic valve
two-seater pneumatic valve pneumatic valve core advantage of the force balance structure, allow the pressure difference is big, it highlights the shortcomings of the two, not is a very good interface sealing at the same time, due to leakage. Used to cut off the occasion if artificially, mandatory, obviously the result is bad, even if it puts forward the ( Such as double seal sleeve pneumatic valve) Did a lot of improvement, is not desirable. What straight travel
3, prevent poor performance regulating pneumatic valve, pneumatic valve Angle trip to collect performance
straight travel pneumatic valve pneumatic throttle valve core is vertical, and medium level, pneumatic valve cavity flow must turn down turn, make pneumatic valve flow becomes quite complex ( Such as the shape of 'S' type inversion) Levels. Therefore, there are many dead, precipitation provides the space of the medium and long run, cause congestion. Rotary pneumatic valve throttling direction is horizontal, flow into the flow of medium level, easy to clean medium, flow simple at the same time, the precipitation of medium space is very few, so try to prevent the performance of the rotary pneumatic valve.
4, why small pneumatic valve stem straight travel
it involves a simple mechanical principle: sliding friction, 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, have larger rebound. For this, pneumatic valve stem design is very small, the other four fluorine packing friction coefficient of the commonly used packing, in order to reduce the return difference, but the problem is that the pneumatic valve stem thin, easy to bend, packing and short service life. Is the best way to solve this problem, the pneumatic valve stem with the travel agency, or rotary control pneumatic valve, pneumatic valve stem stem to times thicker than straight travel, last longer and use graphite packing, pneumatic valve stem good stiffness, packing life is long, but the friction torque is small, small hysteresis.
5, why to cut off the pneumatic valve rotary pressure greater?
rotary pneumatic valves, cut off the more pressure, because in the pneumatic valve core or pneumatic valve plate torque on the shaft of the media is a very small, so it can withstand greater pressure.
why June desalting water use rubber lining butterfly pneumatic valve, short service life of lining fluorine pneumatic diaphragm valve?
water containing low concentration of acid or alkali in water desalination, they have more corrosion in rubber. Anticorrosion properties of the rubber expansion, aging, low intensity, and the line with rubber butterfly pneumatic valve, pneumatic diaphragm valve use effect is bad is, in essence the rubber is not caused by corrosion. After the rubber lining pneumatic diaphragm valve improved lining pneumatic diaphragm valve good corrosion resistance, but the lining pneumatic diaphragm valve diaphragm and yield to fold up and down and were broken broken, mechanical damage, the shorter the life of pneumatic valve. Now is the best way to deal with water special pneumatic ball valve, it can be used to years.
7, why use hard stop pneumatic valve should be closed
to cut off the pneumatic valve for leakage is lower, the better, soft seal leakage of pneumatic valve is minimum cut off effect is good, but not wear-resisting, poor reliability. From leakage and small, reliable sealing and double standards, hard and soft block and block. As a fully functional, such as ultra light regulating pneumatic valve, sealing with wear-resistant alloy protection, high reliability, the leakage rate of reactor solstice, have been able to meet the requirements of cut off the pneumatic valve. Eight,
why sleeve for single pneumatic valve, pneumatic valve seat has not yet occurred
pneumatic valve sleeve century the arrival of the year, a scale used at home and abroad to introduce a petrochemical factory of pneumatic valve sleeve, a larger proportion, at that time, a lot of people think, pneumatic valve can replace single sleeve, two-seater pneumatic valve, the second generation product. Now, this is not the case, single-seat pneumatic valve, pneumatic valve, two-seat sleeve the use of pneumatic valves are the same. This is because the sleeve in the form of pneumatic valve throttling improved, maintain the stability of the single-seat pneumatic valve, but its weight, with the single, two-seater pneumatic valve to prevent leakage and goals are the same, it can replace single, two-seater pneumatic valve? Therefore, only use together.
in September, why is more important than the calculation of
calculation and comparison selection, choice is more important, much more complicated. Because computing is just a simple formula, which itself is not accurate formula, but the given parameter is accurate. More related content choice, have a bit inadvertent, will lead to improper selection, not only caused by human, material and financial resources waste, and use effect is not ideal, brings the user's problems, such as reliability, longevity, quantity, quality of operation.
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