Tri-link checks shall have reversible elastomer discs and in operation shall produce drip tight closure against reverse flow caused by backpressure or backsiphonage.

• 三连接止回阀应该配置双向合成橡胶阀瓣，运行时对于由于反压力或发虹吸产生的反向流动具有不透水的密封性。