backing pressure meaning in English

前级压强
托持压力
托持压强
预抽真空
增压压力

Several different types of valves are in use. some are back pressure valves .
有几种不同的阀在使用中，有些是反向压力阀。
Diplegs play an important role as pressure seals against the considerable back pressure generated .
料腿则起着对产生的相当大的背压加压密封作用。
Increase back pressure and lower screw rotation speed
增加背压和降低螺杆转速
The effect of which back pressure to the performance of safety valve
背压对安全阀性能的影响
Application of shuttle back pressure valve in fluid transportat ion
梭式止回阀在流体输送中的应用

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