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The pressure washer was invented in 1950 by Alfred Karcher. It is a mechanical sprayer that sprays water at very high pressures in gallons or litres per minute. It produces a pressure 750 to 30,000 psi and there are higher pressured washers available in the market for industrial purposes. There are different types of pressure washers for indoor purposes where the power supply is electricity or a battery and for outdoor purposes which use fuel or propane to power it.
When the pump is first turned on the pressure washer is powered by a motor inside the pump. The washer is attached to a water supply hose, from where the water is drawn and is pressurised by the pump using spring loaded pistons. These pressurise the water by a constant up and down motion. This movement occurs as the motor turns at a high-speed pushing a metal plate to rotate over the pistons in an alternating manner. The pistons move as this plate pushes onto them thus, pressurising the water which is then pushed into the jet hose. The water passes through the hose and it stops at the gun while the trigger is released this, in turn, stops the motor. Once the trigger of the pressure washer is pressed the motor is started again and the water shoots out at a high speed through the nozzle at the end of the spray wand. Water pressure is converted to speed at the nozzle as it is a lot smaller than the rest of the wand and since water cannot be compressed, it is released through the nozzle at a higher speed. The width of the jet controls the spray power. If the jet is bigger, the speed of the water is less and if the jet is narrow it is of higher speed and pressure.
Uses and Advantages
The pressure washer is used for cleaning paint, dirt, debris and other impurities off cars, pavements, walls etc. This is done thanks to the pressure exerted and since it is so precise the pressure washer cleans the intended area with a very little water and at a much faster rate.