Double Check Valve Assemblies shall consist of two positive seating check valves located between two resilient seated shutoffs with four ball valve type test cocks.
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释义
这种双止回阀总成应该由两个正向密封止回阀,夹在两个弹性阀座关闭阀之间,并配置四个球阀型测试旋塞构成。
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