弹簧止回阀 meaning in English

spring loaded check valve
spring-loaded check valve

Torsion spring checks shall have reversible elastomer discs and in operation produce drip tight closure against reverse flow caused by backpressure or backsiphonage
扭力弹簧止回阀应该配置双向合成橡胶阀瓣，并且在工作时对于反压力和反虹吸所产生的回流具有防滴漏关闭性能。
The reduced pressure detector assembly shall consist of two independent torsion spring check modules , a differential pressure relief valve located between and below the two modules , two drip tight shutoff valves , and required torsion spring check modules and relief valve shall be contained within a sleeve accessible single housing constructed from 304 ( sch 40 ) stainless steel pipe with groove end connections
这种减压检测器总成应该包括两个独立扭力弹簧止回阀模块，一个位于两个模块之间的下方的差压安全阀，两个防滴漏关闭阀，并且要求扭力弹簧止回模块和安全阀应该放置在一个套筒内，要易于接近带沟槽连接的304 （目录40 ）不锈钢管的单个外壳。