Pressure Washers
A pressure washer is a mechanical device that uses high-pressure water to many surfaces and objects such as buildings, vehicles and concrete road surfaces. Professional equipment can produce pressures of 4000 psi or more. more...
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The most basic pressure washer consists of:
an electric motor or gasoline-powered engine,;
a water pump, and;
a frame that holds to power source and high pressure water pump;
high pressure hose;
trigger gun;
One of the most important accessories that controls the water is the nozzle. Several different types of nozzles are available, each useful for a particular application. Some nozzles cause the water jet to be ejected in a triangular plane, while others emit a pencil-thin jet of water, which spirals around rapidly. Most nozzles attach directly to the trigger gun.
Some pressure washers, in combination with a particular nozzle, allow detergent to be introduced into the water stream, assisting in the cleaning process. Two types of chemical injectors are available, a low-pressure injector and a high pressure injector.
Pressure washers are dangerous tools, and should be operated with due regard to safety instructions. The water pressure near the nozzle is powerful enough to strip flesh from bone. Objects in the water supply can be ejected from the nozzle at great velocities. The cleaning process can propel objects from the surface being cleaned, also at great velocities. Pressure washers have a tendency to break up asphalt if aimed directly at it, due to high pressure water entering cracks and voids in the surface.
Additional Notes: Some Professional Units use Diesel Fuel.
Most "home-owner" units (commonly found either online or at "big box" stores) are electric or gas powered. The electric ones plug into a normal outlet, and use/produce cold water. Some professional models can generate hot water, which can be ideal for loosening and removing oil and grease. However, since it can be hot, it is best for the home-owner or infrequent user to leave those tools to the professional.
Read more at Wikipedia.org
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