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1, why the two-seat valve small opening work is easy to oscillate? For single-core, when the medium is open-type, the valve stability is good; when the medium is closed, the valve stability is poor. Double seat valve has two spool, the lower spool in the flow closed, the spool in the flow open, so that in the small opening work, the flow closure of the valve core is easy to cause the valve vibration, which is double seat valve Can not be used for small opening work of the reasons. The following are the same as the "

2, why double sealed valve can not be used as a shut-off valve? Double seat valve spool has the advantage of force balance structure, allowing the pressure difference, and it highlights the shortcomings of the two sealing surface can not be good contact, resulting in leakage. It is not advisable to make it a lot of improvements (such as double seal sleeves) if it is artificially and forcefully used for cutting applications. The following are the same as the "

3, what straight stroke control valve anti-blocking performance is poor, angular travel valve anti-blocking performance is good? Straight valve spool is a vertical throttling, and the media is the level of flow into and out of the valve cavity flow channel must turn down, Of the flow path becomes quite complex (shape such as inverted "S" type). In this way, there are many dead zones that provide space for the precipitation of the medium, which in the past causes clogging. Hongfeng found that the direction of the trip valve is the direction of the direction of the flow, the level of the media into the horizontal outflow, easy to take away the clean media, while the flow of simple, medium precipitation space is also very small, so the angle of the valve anti- it is good. The following are the same as the "

4, why straight stroke valve stem finer? It involves a simple mechanical principle: sliding friction, rolling friction small. Straight stroke valve stem up and down movement, packing slightly pressed a little, it will be very tight valve stem, resulting in a larger hysteresis. To this end, the stem is designed to be very small, the filler is often a small friction coefficient of PTFE filler in order to reduce the hysteresis, but the problem is sent stem fine, easy to bend, filler life is short. To solve this problem, the best way is to use the travel valve stem, that is, the angle of the class of the control valve, its stem stem straight stroke stem 2 to 3 times, and the choice of long life graphite packing, stem stiffness Well, the filler life is long, the friction torque is small, the hysteresis is small. The following are the same as the "

5, why the angle of the valve class to cut off the larger pressure difference angle travel valve pressure difference is large, because the media in the spool or valve plate on the resultant force on the rotating shaft torque is very small, so it Can withstand greater pressure. The following are the same as the "

6, why desalination water medium using lacquered butterfly valve, lined diaphragm valve short life? Desalted water medium contains low concentrations of acid or alkali, they are more corrosive to rubber. Rubber corrosion is manifested as expansion, aging, low strength, with rubber lined butterfly valve, diaphragm valve use effect is poor, its essence is caused by rubber corrosion resistance. Hongfeng valve that the back rubber diaphragm valve for the improvement of good corrosion resistance of the lining of the diaphragm valve, but the lining of the diaphragm diaphragm can not withstand the folding up and down was broken, resulting in mechanical damage, the valve life shorter The Now the best way is to use water treatment dedicated ball valve, it can be used to 5 to 8 years. The following are the same as the "

Precision oil shock absorber manufacturers have a strong technical force, with a group of professional and technical personnel; improve the quality control, product performance and stability, quality and reliable. Praised by the majority of users

 

oil shock absorber      oil buffer            hydraulic cylinder


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