automatic water level valve是什么意思

用法例句

Structure design and application of hydraulic automatic pressure-increasing valve;

因此 ,需研制结构简单、成本低、效率高的水压自动增压阀 。

The design and lectotype of circulating pump, automatic return water switch valve, expansion tank and atmospheric connection pipe in atmospheric hot water heating boiler room are discussed.

对常压热水供热锅炉房的循环泵、回水自动启闭阀、膨胀水箱、大气连通管的设计选型进行了探讨。