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Why is the stem of the straight stroke regulating valve thinner?
Release time:
2022/05/19 16:19
It involves a simple mechanical principle: large sliding friction and small rolling friction. Straight travel valve stem up and down movement, packing a little tight, it will be the stem wrapped very tight, resulting in a larger return. For this reason, the valve stem is designed to be very small, and the filler is often used to have a small coefficient of friction to reduce the backwardness. However, the problem caused by this is that the valve stem is thin, which is easy to bend and the filler life is short. To solve this problem, the best way is to use the travel valve stem, that is, the angle of the type of control valve, its stem than the straight stroke stem 2~3 times thicker, and the use of long life of graphite packing, stem stiffness, packing long life.
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Why can't double seal valve be used as shut-off valve?
The advantage of the double-seat valve spool is the force balance structure, allowing large pressure differences, and its outstanding disadvantage is that the two sealing surfaces cannot be in good contact at the same time, resulting in large leakage. If it is artificially and forcibly used to cut off the occasion, the effect is obviously not good, even if it has made many improvements (such as double-sealed sleeve valve), it is not desirable.
For single core, when the medium is open flow type, the valve stability is good; when the medium is closed flow type, the stability of the valve is poor. The double-seat valve has two valve cores. The lower valve core is in flow closure and the upper valve core is in flow opening. In this way, when working with small opening degree, the flow closing valve core is easy to cause vibration of the valve. This is the reason why the double-seat valve cannot be used for working with small opening degree.
Why is the stem of the straight stroke regulating valve thinner?
It involves a simple mechanical principle: large sliding friction and small rolling friction. Straight travel valve stem up and down movement, packing a little tight, it will be the stem wrapped very tight, resulting in a larger return. For this reason, the valve stem is designed to be very small, and the filler is often used to have a small coefficient of friction to reduce the backwardness. However, the problem caused by this is that the valve stem is thin, which is easy to bend and the filler life is short. To solve this problem, the best way is to use the travel valve stem, that is, the angle of the type of control valve, its stem than the straight stroke stem 2~3 times thicker, and the use of long life of graphite packing, stem stiffness, packing long life.
According to the special needs of the petroleum industry, choose the appropriate valve type, such as ball valve, globe valve, check valve, regulating valve and safety valve. Ball valve is widely used in oil pipeline transportation, processing and storage because of its simple operation, small pressure loss and reliable sealing.
Solution: By controlling the opening and closing of the actuator, the on-off and adjustment of the fluid medium are realized. Electric ball valve has fast response speed and precise control accuracy, which can meet the requirements of rapid response and precise control of fluid medium on-off and regulation in pharmaceutical production, and improve production efficiency.
The chemical medium is usually corrosive, so the valve material needs to choose stainless steel, high alloy steel and other materials with good corrosion resistance to extend the service life of the valve.
CRN Industries (Shanghai) Co., Ltd.
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E-mail:export@crnindustry.com
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