back pressure valve

基本解释

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。
An automatic back pressure adjustment complex valve combining hydraulic control check valve, overflow valve and auto-adjusting back pressure valve has been developed.
开发了一种集液控单向阀、溢流阀和自调整背压阀于一体的背压自调整复合阀。