正排量 meaning in English

positive displacement

Specification for rotary positive displacement fuel pumps
旋转式正排量燃料泵规范
Hydraulic fluid power . positive displacement pumps and motors
液压流体动力.正排量泵和电动机的测定
Specification for rotary positive displacement pumps , commercial ships use
商用船只旋转式正排量泵规范
Standard specification for rotary positive displacement distillate fuel pumps
旋转式正排量蒸馏燃油泵标准规范
Reciprocating positive displacement pumps and pump units - technical requirements
往复式正排量泵和泵装置.技术要求

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