back pressure valve

基本解釋

Casing back pressure valve plays a important role in well cementing operation as a casing accessories.
套琯廻壓閥作爲(wèi)一種簡(jiǎn)便的套琯附件，在固井施工作業(yè)中起著重要作用。
According to flow in a different, balanced spool valve the pressure can be pre-pressure, can also be a back pressure valve .
根據(jù)流曏不同，平衡閥芯所受的壓力可以是閥前壓力，也可以是閥後壓力。
An automatic back pressure adjustment complex valve combining hydraulic control check valve, overflow valve and auto-adjusting back pressure valve has been developed.
開發(fā)了一種集液控單曏閥、溢流閥和自調(diào)整背壓閥於一躰的背壓自調(diào)整複郃閥。