dual valve type

• 双阀型

dual valve type的用法和样例：

例句

1. 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.
   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。