1, why cut-off valve should try to choose hard seal? Cut off the valve for leakage is lower, the better, soft seal valve leakage is the lowest, to cut off the effect of course good, but not wear-resisting, poor reliability. 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 regulator, sealed and pile has wear-resisting alloy protection, high reliability, the leakage rate of 10 - 7, have been able to meet the requirements of the cut-off valve. 2, why double seal Industrial Valves cannot be used as a cut-off valve? Two-seater valve core has the advantage of force balance structure, allow the pressure difference is big, but its disadvantage is that the two seal face not good contact at the same time, cause 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 sealing sleeve valve) It is not desirable. 3, easy oscillation when why small open of the two-seater valve work? For single core, when the medium is away, the valve has good stability; When the medium is flow closed type, the stability of the valve. Two-seater valve has two valve core, the valve core flow closed, valve core in the flow, so that when you are working in a small open degree, flow closed type of valve core is easy to cause the vibration of the valve, this is the reason why two-seat valves cannot be used for small open degree work. 4 what straight travel, held in regulating valve performance is poor, quarter-turn valves prevent performance is good? Straight travel is vertical throttling valve core and the medium is horizontal, cavity flow is bound to turn down turn, make 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 valves throttling direction is horizontal, flow into the medium level, level, easy to take unclean medium, at the same time, simple flow, precipitation medium space is little, so quarter-turn valves prevent performance is good. 5, why straight travel regulator valve stem is fine? Straight stroke regulating Industrial Valves it involves a simple mechanical principle: large sliding friction, rolling friction is small. Straight trip valve stem up and down movement, packing a little pressure, it will wrapped the stem very tight, produce bigger return difference. To this end, the 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 stem thin, easy to bend, packing and short service life. The best way to solve this problem, is to travel with rotary valve stem, namely quarter-turn class regulating valve, the valve stem than straight travel stem thick 2 ~ 3 times, and to choose life long graphite packing, good stiffness, the stem packing long life, instead of the friction torque is small, poor little back. 6, why quarter-turn valves to cut off the pressure difference is bigger? Quarter-turn valves to cut off the pressure difference is bigger, because the media on the valve core and valve plate produced by the resultant force on the rotating shaft torque is very small, so it can bear large pressure difference. 7, why the sleeve valve instead of a single, two-seat valves but I did not get it? In the 60 s of the sleeve valve, extensive use at home and abroad in the 70 s, 80 s introduced in petrochemical plant of sleeve valve ratio is larger, at that time, many people think, sleeve valve can replace single, two-seat valves, become the second generation product. By now, is not the case, single seat valve, two-seat valves, the use of sleeve valve are equal. This is because the sleeve valve is improved throttle form, stability, and safeguard in single-seat valves, but its weight, prevent leakage and indicators are consistent with single, two-seat valves, it can replace single, two-seat valves? So, can only be used together. 8, why desalting water use line with rubber butterfly valve, fluorine-butterfly short service life of the 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, in line with rubber butterfly valve, diaphragm valve use effect is poor, its essence is the rubber is not caused by corrosion. After the rubber diaphragm valve to improve the corrosion resistance of good fluorine-butterfly diaphragm valve, but fluorine-butterfly diaphragm valve diaphragm and yield to fold up and down and were broken broken, mechanical damage, the shorter the life of the valve. Now is the best way to deal with water special ball valve, it can be used to 5 ~ 8 years. 9, why piston actuator used in pneumatic valve will be more and more? For pneumatic valve, piston actuator can make full use of air pressure, make the size of the actuator is smaller than the film type, thrust is bigger, the piston o-rings, than film is reliable, so it will be more and more. 10, why do you say type selection is more important than the calculation? Calculation and selection of comparison, selection is much more important and more complex. Because computing is just a simple formula, its itself is not the accuracy of the formula, but in a given by process parameters are accurate. Selection involves the content is more, a little careless, will lead to improper selection, not only a waste of manpower, material resources, financial resources, and use effect is not ideal, bring some use problems, such as reliability, quality of life, running, etc.
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