direction safeguard valve是什么意思

用法例句

Based on the overload-protective working demands of series JZ21 Baromectric Press,the paper introduces a overload-protective system of Barometric Press,the core of which is pneumatic pump and safety protective valve.

根据JZ2 1系列机械压力机过载保护的工况要求 ,介绍了一种以气动油泵和安全保护阀为核心的气压式过载保护系统 。