directional valve造句怎么写

GIQ pneumatic high vacuum butterfly valve USES solenoid directional valve to change the direction of air passage, and controls the actuating cylinder to drive the butterfly valve opened and closed.

A proportional directional valve however will be controlled by an electrical device more like a dimmer switch.

An integral electronic board, mounted to the side of the valve, may be utilized to control the 4-way directional valve and motor direction (when not using a rotary encoder control).