Reciprocating pump is suitable to transport small flow, high head, high-viscosity liquids, general traffic can be as small as 4.5 cubic meters per hour. Or smaller, the lift can be as high as 15-60 MPa, viscosity up 50000ssu. Such as asphalt pump or the like. Reciprocating pump, electric motor drive reciprocating pump, two high temperature reciprocating pump and steam cylinder drive, the latter also known as steam pump. Petrochemical plants, when transporting small flow, high pressure and high viscous liquid, mostly with the type of pump. The total number of a lot of diverse varieties and specifications, although its power is not large, but because of the valve and other wearing parts, flow pulsation problems brought, has been plagued by technical staff. Reciprocating pump works: reciprocating pump piston alternating suction and discharge. When the rightward movement of the piston from the left-most position, the discharge valve is closed, the expansion of the volume of the working chamber, the fluid under the suction pressure, the top open suction valve, until the piston to come to the right-most point. Conversely piston from right to left traveling, using the cylinder pressure, the suction valve is closed automatically, as the piston goes forward, the liquid will be discharged in the piston under the action of the valve top opening until the piston come sitting dead point is reached. Then the cycle continue.

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