Valves are classified by actuation

According to the driving mode, it is divided into automatic valves, power-driven valves and manual valves:

(1) Automatic valves are valves that do not require external force to drive, but rely on the energy of the medium to make the valve act. Such as safety valves, pressure reducing valves, traps, check valves, automatic regulating valves and so on.

(2) Power driven valve: Power driven valve can be driven by various power sources. Divided into electric valve, pneumatic valve, hydraulic valve and so on. Electric valve: A valve driven by electricity. Pneumatic valve: A valve driven by compressed air. Hydraulic valve: Valve driven by the pressure of liquid such as oil.

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

(3) Manual valve: Manual valve uses manual wheel, handle, lever, sprocket to manually operate the valve. When the valve opening and closing torque is large, a gear or worm reducer can be set between the handwheel and the valve stem. When necessary, you can also use the universal joint and drive shaft for long-distance operation.