... a new single role, bias type, reciprocating triplex plunger pump. It consists of three parts: power side, slow down boxes, ... pressure, flow, etc. YL-600(S)(TWS-600(S))intermittent plunger pump for oil well work, such as: acidification, cementing, fracturing, ... total layer, forming a series of interchangeable pump(3” pump 3-1/2” pump 4” pump 4-1/2” pump), to meet different requirements of the pressure ...