The reciprocating vacuum pump uses the back and forth movement of the piston to transmit energy to the liquid to complete the liquid transport mission. The flow rate of the fluid delivered by the reciprocating pump is only related to the displacement of the piston and the condition of the pipeline, but the lift of the reciprocating pump is only related to the condition of the pipeline.

The reciprocating pumps used in actual production have different structures due to differences in the properties of the liquids to be transported or differences in application targets. When used to transport flammable and explosive liquids, steam-driven reciprocating pumps are often used for safety and reliability.

When conveying corrosive liquid or suspension, in order not to damage the piston, a diaphragm pump is often used, that is, a back and forth spring that isolates the piston and the conveying body with an elastic film. This elastic film is made of abrasive, corrosion-resistant rubber or special metal. All parts on the right side of the barrier are made of corrosion-resistant materials or lined with corrosion-resistant substances; the left side of the barrier is filled with water or oil. When the piston moves back and forth, the diaphragm is forced to bend to both sides, causing the corrosive liquid or suspension to be sucked and pressed out alternately on the right side of the diaphragm. without interfering with the piston. This kind of pump requires huge technical requirements, easy to damage and difficult to maintain.