Torsion spring checks shall have replaceable elastomer discs and in operation produce drip tight closure against the reverse flow of liquid caused by backpressure or backsiphonage.

• 扭力弹簧止回阀应该有可更换合成橡胶阀瓣，并且在工作时对于反压力或反虹吸产生的流体回流能够产生防滴漏密封。