Do you know all this knowledge about valves?
According to power: automatic valve: a valve that relies on the force of the medium itself to operate. Such as check valves, pressure reducing valves, drain valves, safety valves, etc. Drive valve: a valve that is operated by external forces such as manpower, electricity, fluid power, and pneumatic power. Such as globe valves, throttle valves, gate valves, disc valves, ball valves, plug valves, etc