... CNPC,CNOOC As same as SPM TWS-600. Use:YL-600(S)(TWS-600(S))horizontal piston pump ... a new single role, bias type, reciprocating triplex plunger pump. It consists of three parts: power side, ... flow, etc. YL-600(S)(TWS-600(S))intermittent plunger pump for oil well work, such as: acidification, cementing ... needs of different media and different environment.4.The use of bias-type structure, so that the size ...