positive displacement meaning in English

容积式
正排量
正位移

Compressor may be reciprocating positive displacement or centrifugal .
压缩机可以是活塞式、螺杆式或离心式。
Rotary positive displacement pumps - technical requirements
回转容积泵.技术要求
Rotary positive displacement pumps . technical requirements
旋转变容泵.技术要求
Specification for rotary positive displacement fuel pumps
旋转式正排量燃料泵规范
Rotary positive displacement pumps - technical requirements
回转容积泵技术要求

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