常見例句雙語例句Casing back pressure valve plays a important role in well cementing operation as a casing accessories.套管回壓閥作為一種簡便的套管附件，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)流向不同，平衡閥芯所受的壓力可以是閥前壓力，也可以是閥后壓力。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)了一種集液控單向閥、溢流閥和自調整背壓閥于一體的背壓自調整復合閥。 返回 back pressure valve