First, why the double seal valve can not be used as a shut-off valve The advantage of using a double-seat valve spool is that the force balance structure allows a large pressure difference, and its outstanding disadvantage is that the two seal faces cannot be in good contact at the same time, resulting in a large leak. If it is artificially and forcibly used to cut off the occasion, it obviously does not work well, even if it has made many improvements (such as double-sealed sleeve valves),
It is also not advisable.
Second, why the straight stroke control valve stem is thinner It involves a simple mechanical principle: large sliding friction, small rolling friction. The valve stem of the straight stroke valve moves up and down, and the packing is slightly pressed tightly, which will tightly seal the valve stem and produce a large backlash. For this reason, the valve stem is designed to be very small, and the filler is also commonly used with a small friction coefficient of PTFE filler to reduce the backlash, but the problem is that the valve stem is thin, the bend is easy, and the filler life is short.
Third, what is the straight-stroke regulating valve anti-blocking performance, the angular stroke valve anti-blocking performance is good, the straight-stroke valve spool is vertical throttling, and the medium is horizontally flowing in and out, the flow channel in the valve cavity must turn and turn, making the valve The flow path becomes quite complicated (the shape is inverted "S" type). In this way, there are many dead zones that provide space for the precipitation of the medium, which in the long run causes blockage. The direction of the angular stroke valve throttling is the horizontal direction. The medium flows horizontally and horizontally, which makes it easy to take away the dirty medium. At the same time, the flow path is simple, and the space for the medium to precipitate is also small, so the anti-blocking performance of the angular stroke valve is good.
Fourth, why should the shut-off valve be as hard as possible? Solenoid valve shut-off valve requires the lower the leakage, the better, the leakage of the soft seal valve is low, the cutting effect is of course good, but not wear-resistant, poor reliability. From the double standard of small leakage, sealing and reliability, the soft seal cut is not as good as the hard seal cut. Such as full-featured ultra-needle valve, sealed and protected by wear-resistant alloy, high reliability, leakage rate of 10-7, has been able to meet the requirements of the shut-off valve.
5. Why is the cut-off pressure difference of the angular stroke type valve larger? The cut-off pressure difference of the gate valve type stroke type valve is large because the resultant force of the medium on the valve core or the valve plate generates a very small torque to the rotating shaft, and therefore, it can withstand a large pressure difference. Steam trap, why does the desiccant medium use a rubber-lined butterfly valve, and the fluorine-lined diaphragm valve has a short service life?
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