The high-pressure cleaning machine uses water as the working medium, and is composed of a booster pump and a power drive unit. Usually, the power drive pump completes a suction and discharge process for water, converting ordinary water into high-pressure and low-flow water. Then it is sent to the high-pressure pipeline, so that it reaches the high-pressure nozzle with a certain amount of energy. The hole diameter of the high-pressure nozzle is much smaller than the diameter of the high-pressure pipe, so the water reaching the high-pressure nozzle must be accelerated in order to pass through the nozzle. In this way, the nozzle can convert high-pressure, low-flow water into a low-pressure, high-velocity jet. The amount of water flow can be controlled in three ways, by increasing or decreasing the inner diameter of the pump head, and by lengthening or shortening the stroke of the plunger. By increasing or decreasing the reciprocating speed of the plunger. Most high-pressure cleaners use a valve and pump head to form a system. The plunger pulls water into the inlet valve and pressurizes it through the outlet valve. Valves control the passage of water through the pump by preventing backflow. The valve consists of a spring and a bracket, and the pressure operation is done due to the different pressure difference on both sides of the valve. The valve opens when the pressure acting on the valve is greater than the capacity of the spring. On the opposite stroke, the water automatically squeezes the bracket against the valve seat, keeping the valve closed and preventing backflow.

    The ejected high-pressure water jet tangentially or positively impacts the surface of the object to be cleaned (workpiece), which is called jet operation. High-pressure water jets are the simplest form of energy transformation and application. When the impact force of the high-pressure water jet is greater than the adhesion between the dirt and the surface of the object, the dirt will be peeled off and washed away to achieve a cleaning equipment for cleaning the surface of the object. Because high-pressure cleaners use high-pressure water columns to clean up dirt, high-pressure cleaners are also recognized as one of the most scientific, economical and environmentally friendly cleaning methods in the world.