double action pump 双动泵

duplex double action pump 双缸双作用泵

double action vane pump 双作用滑片泵 ; 双作用叶片泵 ; 双效用滑片泵

Double action reciprocating pump 双作用往复泵 ; 双作用活塞式往复泵

double action vane pump coupling 双作用滑片泵联轴器

Double action reciprocation pump 双作用往复泵

double action rod pump 双作用抽油泵

double action impeller pump 双作用叶片泵

double action oil well pump 双作用抽油泵

double-action variable displacement pump 双向变量泵