Why can't double seal valve be used as shut-off valve?

Release time:

2024-05-10

Source:

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.

In the pipeline system, the valve plays a vital role. When it is necessary to connect or cut off the medium in the pipeline, the cut-off valve can play its role. Through the lifting movement of the valve flap, the cut-off valve can realize the complete opening or closing of the medium, so as to realize the precise control of the medium circulation in the pipeline. However, it is worth noting that the shut-off valve is not suitable for use as a throttle device. Although the lifting movement of the valve can adjust the flow of the medium to a certain extent, this method is not accurate and is easy to cause damage to the valve itself.