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本标准适用于石油或天然气钻井用的双作用和三缸单作用往复型活塞泵。一、型式 1、缸数及作用型式：双缸双作用和三
This standard applies to double-acting and triple-acting reciprocating piston pumps for oil or gas drilling applications. First, the type 1, the number of cylinders and the role of type: double cylinder double and three