A working fluid pump is a type of pump used to transport working fluids; its primary function is to move liquid or gas working fluids from one place to another. The working medium can be water, oil, chemical liquids, gases, etc. It is very important to select the appropriate model and material for the pump depending on the type of medium. The principle of working fluid pumps varies depending on the type of pump. The common types of working fluid pumps are as follows: 1. Centrifugal pump: It uses a rotating impeller to apply centrifugal force on the fluid, thereby giving the fluid kinetic energy; this kinetic energy is then converted into pressure energy and velocity energy of the fluid, which drives the fluid forward for transport. Suitable for transporting low-viscosity liquids, such as water and light oils. 2. Axial flow pumps and mixed-flow pumps: They move the fluid along the axis of the impeller through its rotation, thereby increasing the fluid’s energy. Axial flow pumps are suitable for applications requiring high flow rates and low head, while mixed-flow pumps lie between centrifugal pumps and axial flow pumps. 3. Reciprocating pump: It draws in and discharges fluid by the reciprocating motion of a piston or plunger inside the pump cylinder, and is suitable for transporting high-pressure or viscous fluids. 4. Rotary pumps: Such as screw pumps and gear pumps, they use rotating components like screws or gears to push the fluid from the suction side to the discharge side. 5. Diaphragm pumps: These pumps change the volume of the pump chamber through the reciprocating movement of a flexible diaphragm, thereby sucking in and discharging the medium. This type of pump has low requirements regarding the cleanliness of the medium and can transport media containing solid particles. Working fluid pumps have a wide range of applications. Depending on the characteristics of each pump, they can be used in various fields, such as: – Industrial sector: fluid transfer in industries like chemicals, petroleum, food, and pharmaceuticals. - Agricultural sector: irrigation, pesticide spraying, etc. - Domestic water supply: the extraction and delivery of tap water. - Environmental protection: wastewater treatment, sewage transportation, etc. - Energy: water injection into oil wells, geothermal fluid circulation, etc. In summary, working fluid pumps play an important role in industry and daily life, effectively helping us transport various types of working fluids. .