求翻译：它采用开放式结构，简单可靠。传压介质为空气，升降压平稳。在拉压泵与螺旋泵之间没有截止阀，提高气密性。它既能抽真空又能产生正压，且调节细度高达0.1Pa，满足精密计量要求。同时它还可配套连接管进行压力远传。压力泵的回检阀在被检表处，被检仪表中的污染物在校验时直接排出，避免阻塞泵体。它采用进口优质合金材料和密封件等精制而成，是校验真空、低压及中压压力仪表的理想设备。是什么意思？

It uses an open architecture that is simple and reliable. Pressure transmission medium is air, buck-smooth. Globe valve, pull the pump and screw pump to improve the air tightness. It can vacuum can generate positive pressure, and to adjust the fineness of up to 0.1pa meet precision measurement requi

It is an open structure, simple and reliable. The air pressure media pressure, smooth movements. The drop-down-pressure pump and spiral between the pumps have no valves, gas tight. It is vacuum to create a positive pressure, and fine tune up to 0.1 to meet Pa precision metrology requirements. It als

It uses open architecture, simple and reliable. Pressure medium air, lifting pressure smoothly. Tension-compression pump and screw pump has no valve, increasing air tightness. It can produce both vacuum and pressure and adjust the fineness up to 0.1Pa, meet the precision metering requirements. While