Piston pump is also called electric reciprocating pump, from the structure is divided into single cylinder and multi-cylinder, which is characterized by high head. It is suitable for conveying oil emulsion without solid particles at room temperature. Used for oilfield, coal seam water injection, oil injection, oil production, pressure machine hydraulic press power pump, hydraulic cleaning sand, fertilizer plant conveying ammonia liquid. If the over-flow parts are stainless steel, corrosive liquids can be transported. In addition, according to the structure of different materials can also be transported high-temperature tar, slime, high concentration of mortar, high viscosity liquid and so on.