... a new single role, bias type, reciprocating triplex plunger pump. It consists of three parts: power side, slow down ... pressure, flow, etc. YL-600(S)(TWS-600(S))intermittent plunger pump for oil well work, such as: acidification, cementing, fracturing, ... pump 4” pump 4-1/2” pump), to meet different requirements of the pressure and displacement.3.Packing optional components, valve train, exhaust flange ...