The reciprocating pump is a displacement pump, it is the reciprocating motion of the piston or plunger in the pump cylinder, so that the working volume of pump cylinder is expanded and shrunk periodically to absorb the liquid. The reciprocating pump is usually composed of two basic parts, one end is the realization of mechanical energy conversion into pressure energy, and directly conveying the liquid part, called the liquid cylinder part or the hydraulic end; The other end is the power and drive part, called the power end.
The hydraulic end of reciprocating pump consists of piston (or plunger), cylinder body (pump cylinder), suction valve and discharge valve. The transmission end is mainly composed of crank, connecting rod and cross. Reciprocating pump is a typical volumetric pump, reciprocating motion of piston is realized by crank connecting rod mechanism.
Piston when the piston right on the left side of the pump cylinder volume increases, pressure decreases, aspirating slot liquid under the action of liquid surface pressure rising through the pipettes, top drive pump suction fluid on the cylinder valve into the pump cylinder, this process is called liquid absorption process. Then, the piston connecting rod leads, the from right check point, move to the left dead point at this time the volume decrease in cylinder piston pump on the left, after the fluid pressure in the cylinder top open the drain valve on the pump cylinder into the drainage pipe, run until the piston to the left the check points, the drainage process is over. The reciprocating motion of the piston is called a working cycle, so the working cycle of the reciprocating pump is only to inhale and expel the two processes, and the distance between the inner and outer stops is called the stroke or stroke of the piston.