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Valve classification --- classified by driving method

According to the drive classification, it is divided into automatic valves, power driven valves and manual valves:
The
(1) Automatic valves are valves that do not require external force to drive, but rely on the media's own energy to actuate the valve. Such as safety valves, pressure relief valves, traps, check valves, automatic control valves.

(2) Power Actuated Valve: The power actuated valve can be driven by various power sources. Divided into electric valves, pneumatic valves, hydraulic valves and so on. Electric valve: With the help of electrically driven valves. Pneumatic valves: Valves driven by compressed air. Hydraulic valve: Valve driven by liquid pressure, such as oil.

In addition, there are several combinations of driving methods such as gas-electric valves.

(3) Manual valve: The manual valve uses the handwheel, handle, lever and sprockets to maneuver the valve. When the valve opening and closing torque is large, a gear or worm gear reducer can be provided between the hand wheel and the valve stem. When necessary, it is also possible to use a universal joint and a transmission shaft for long-distance operation.

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