And a gasket, matching the elastomeric valve seals, is installed in the bottom flange joint, regardless of attached valve type, in order to seal external fluid from the housing interior.

• 为了密封外壳，使得流体不会从外壳内泄露出来，需要一个与阀门弹性密封相配的垫圈，安装在底部法兰连接件里，而无论所连接的阀门是什么类型。