In a high pressure washer , the pump plays a vital role. The task of the pump is to receive water at normal pressure and create high pressure water. The pumps themselves have different types and perform different functions. The pumps has the three main components of the Inlet valve, drain valve and movable section. The functions of the pumps are divided into two sections, dewatering and pushing. With the back of the moving section and making negative pressure, that makes inlet valve open and outlet valve closed, as a result of the dewatering of the inner compartment of the pump. By moving the moving section of pump, a positive pressure is generated inside the chamber, which results in the valve closing the inlet valve and opening the outlet valve. As a result, high-pressure water comes out of the pump.
The movable part of the pump is piston or plunger. The piston is a tall, narrow arm that is wider in the upper part. At high pressures, the possibility of bending this long and narrow arm is high, so it is only used for low pressures. Plunger is a thick cylinder, which is why it has high resistance and is used at high pressures.
A motor is used to provide pump propulsion. The motion of the rotary motor and the movement of the pump are reciprocating, so for the moment to turn to linear motion, there must be an intermediate part for the transmission of force. The power transmission system can be either a swash plate or crankshaft. In the first model, the engine power enters swash plate and causes its non-uniform rotation. The movement of the plate makes it possible at the points of the plunger to be pulled back by the spring and dewatering operations take place. At another point in the movement of the plate, a pressure is introduced at the end of the plunger and causes the high pressure water to flow out. The second model has a rod called a crankshaft. By turning the crankshaft to the dent, the springs cause plunger to retreat and dewatering. The rotation of the crankshaft to the bulge pushes the plunger forward and the high pressure water flows at the outlet.
In the absence of water, the temperature and friction increase in plunger and the pump, which causes the pressure washer to fail. If plunger passes through a Teflon-graphite ring, a soft property is created that reduces the temperature and friction in the pump. So these types of pumps can last longer when lack of water.