If by their ticket enforcement agencies use the power, control valves can be divided into pneumatic, electrical, fluid movement three, namely to compressed air to power sources pneumatic - valve to call for the engine electric control valves for the liqui
If by their ticket enforcement agencies use the power, control valves can be divided into pneumatic, electrical, fluid movement three, namely to compressed air to power sources pneumatic - valve to call for the engine electric control valves for the liqui
如果按其所配执行机构使用的动力，控制阀可以分为气动、电动、液动三种，即以压缩空气为动力源的气动调节阀，以电为动力源的电动控制阀，以液体介质(如油等)压力为动力的电液动控制阀，另外，按其功能和特性分，还有电磁阀、电子式、智能式、现场总线型控制阀等。