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Valve switch

The first type of automatic valve: a valve that acts by itself depending on the capacity of the medium (liquid and gas). Such as check valve, safety valve, regulating valve, drain valve, pressure reducing valve, etc.
The second type of drive valve: the valve operated by manual, electric, hydraulic and pneumatic means, such as butterfly valve, ball valve, gate valve, stop valve, throttle valve, plug valve, etc.

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