back valve

常见例句

Casing back pressure valve plays a important role in well cementing operation as a casing accessories.
套管回压阀作为一种简便的套管附件，在固井施工作业中起着重要作用。
According to flow in a different, balanced spool valve the pressure can be pre-pressure, can also be a back pressure valve .
根据流向不同，平衡阀芯所受的压力可以是阀前压力，也可以是阀后压力。
The performance and structure of existing back valve are introduced, and an ultra-low pressure startup back valve, which can be fixed freely in any pipes with any directions, is designed.
对现有止回阀的性能、结构进行了分析，设计了一种可以随意安装于各种方向的管道中的超低压力启动上回阀。

We've yet to hear back from Valve for clarification.
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