Why is the cut-off pressure difference of angular distance type valve large? The cut-off pressure difference of the angular distance valve is large because the solidarity of the medium being occurring in the valve core or the valve plate is extremely small for the momentum moment of the rotating shaft. Therefore, it can accept a large pressure difference. Next, I will introduce several common problems of stainless steel gate valves.
1. Why does the stainless steel gate valve double-seat valve oscillate easily during small opening tasks?
For a single core, when the medium is a flow-open type, the valve has good stability; when the medium is a flow-closed type, the valve has poor stability. The double-seat valve has two spools, the lower spool lies in the flow closure, and the upper spool lies in the flow opening. In this way, when the task of a small opening degree, the flow-closed spool simply causes the valve to vibrate. This is why the double seat valve is not suitable for small openings.
2. Why can’t the double seal valve be used as a shut-off valve?
The strength of the double seat valve spool is the structure of force imbalance, which causes a large pressure difference. And its general deficiency is that two secret book covers make it impossible to make good contact with the same voice, forming a large leakage. If it is used artificially and compulsively to cut off the place, it will obviously not work well. Even if many improvements are made to it (such as double-sealed sleeve valves), it is not feasible.
3. Why is the anti-blocking function of the straight-path conditioning valve poor?
The angular distance valve has a good anti-blocking function. The spool of the straight distance valve is vertical medium, and the medium flows in and out. The flow path in the valve cavity must be turned round and round to make the flow path of the valve equally simple (like the shape of an inverted “S”). That way, with many dead zones, it takes time for the deposition of the medium, and blockages form over time. The position of the angular distance valve medium is the degree position. The medium flows in and out, it is easy to take away the unsalted medium, the simultaneous flow path is easy, and the time for the medium to deposit is also small, because the angle path valve has a good anti-blocking function.
4. Why is the straight stem valve stem thinner?
It touches on the once-easy machine principle: gliding conflicts are large, and bone conflicts are small. The stem of the straight-way valve moves high and low, and the aggregate is slightly compressed by half, and it will wrap the stem tightly, causing a large backlash. For this reason, the valve rod is conceived to be extremely thick, and the aggregate is usually a tetrafluoro aggregate with a small collision coefficient, and the return difference is not reduced. However, the problem sent from this is that the valve stem is thin, it is easy to bend, and the life of the aggregate is also short. The best way to deal with a problem is to use a rotary valve stem, which is an angular distance conditioning valve. Its valve stem is 2 to 3 times thicker than a straight-path valve stem, and it uses graphite aggregate with a long service life. The valve stem has a good degree and the aggregate service life is long. Conflicting momentum moments are relatively small and the return difference is small.
Stainless steel gate valve should be paid attention to the low-deep acid or alkali in the desalinated medium, they are relatively aggressive to rubber. The erosion of rubber is manifested by shrinkage, aging, and low strength. The rubber-lined butterfly valve and diaphragm valve have poor application results. The essence is that rubber is not resistant to erosion.
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