depressurize

Always depressurize a regulator before closing the adjusting knob and removing the regulator from the cylinder.

调整钮和从钢瓶上断开调整器之前，总是使调整器减压。

Should a valve need repair, depressurize and drain the system on both sides of the valve.

如果一个阀门需要维修，则阀门的两侧对系统进行减压和排放。