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Question:

Why the valve can only be fully open and fully closed valve can adjust the flow?

Why the valve can only be fully open and fully closed valve can adjust the flow?

Answer:

You said the cut-off valve is that the spool is rotating rather than vertical movement structure?Theoretically, the flow regulation can be realized by controlling the position (angle or distance), and all of them have mature products.
Gate valve, stop valve are switching type valve, adjust the flow can not talk about, can only do so called throttle.You say "stop valve" or "translation" problem, in English, globe valve and valve word is often the same.
Valve, if adjusted, it is easy to wash the sealing surface, resulting in sealing surface damage.

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