... CNPC,CNOOC As same as SPM TWS-600. Use:YL-600(S)(TWS-600(S))horizontal piston ... , bias type, reciprocating triplex plunger pump. It consists of three parts: power side, slow down boxes, hydraulic ... to and meet the needs of different media and different environment.4.The use of bias-type structure, so ... that the size of pumps to reduce weight. ...