suction pressure gauge的意思|示意

Pump could not suction water. The fingers of pressure gauge and vacuum gauge swing acutely.

水泵不吸水，压力表及真空表的指针在剧烈摆动。

A gauge measures the pressure of the suction.

有一个测量器来测量抽的压力。

Unscrew the nut from the service connection of suction line valve and connect the compound pressure gauge.

将真空泵连于复合压力表，打开复合压力表和真空泵对室内机和连接管抽真空。