单作用，单杆，弹簧复位。

Single acting, single rod, spring return.

youdao

压力一直积累，直到减压阀起作用，接着压力复位。

Pressure builds up until the pressure relief device functions and then reseats.

youdao

压力一直积累，直到减压阀起作用，接着压力复位。

Pressure builds up until the pressure relief device functions and then reseats.

youdao