Why is the cut-off pressure difference of the angular s […]
Why is the cut-off pressure difference of the angular stroke type valve larger?
The cut-off pressure difference of the angular 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.
Why is the straight stroke control valve stem thin?
It involves a simple mechanical principle: large sliding friction and low 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 tetrafluorofiller to reduce the backlash, but the problem is that the valve stem is thin, the bend is easy, and the filler life is short. The best way to solve this problem is to use the travel valve stem, that is, the angular stroke type regulating valve. Its valve stem is 2 to 3 times thicker than the straight stroke valve stem, and the graphite packing with long life is selected. Well, the filler has a long life and what is a hard seal?
The shut-off valve requires that the leakage is as low as possible, the leakage of the soft-sealed valve is the lowest, and the cutting effect is of course good, but it is not wear-resistant and has poor reliability. From the double standard of small leakage, sealed and reliable, the soft seal cut is not as good as the hard seal cut. Such as full-featured ultra-light regulating valve, sealed and covered with wear-resistant alloy protection, high reliability, leakage rate of 10 ~ 7, has been able to meet the requirements of the shut-off valve.
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