Series 774XDCDA contains two independently operating check valves located between two resilient seated shutoffs with four ball valve type test cocks and a hydraulically balanced metered bypass line to detect low flows.
Series 774XDCDA contains two independently operating check valves located between two resilient seated shutoffs with four ball valve type test cocks and a hydraulically balanced metered bypass line to detect low flows.
系列774XDCDA包含两个独立运行的止回阀，位于两个弹性阀座关闭阀之间，并配置四个球阀型测试旋塞，以及一个液压平衡仪表旁路管线用于检测低流量。