What Is Pressure Washing
A power washer or pressure washer is a high-pressure automatic sprayer used to take out loose paint, grime, mud, mold, dust, and dirt from surfaces and objects such as vehicles, buildings, and concrete surfaces. The quantity of a pressure washer is expressed in gallons per minute, usually designed into the pump and not variable. The pressure, stated in pounds per square inch, is concentrated into the pump but can be varied by adjusting the unloader valve.
The basic pressure washer consists of a motor that drives a high-pressure water pump, a high-pressure hose, and a trigger gun-style switch. Just as a garden hose vent is used to increase the velocity of water, a pressure washer produces high pressure and velocity.
Different types of nozzles are available for special applications. Some vents produce a water jet that is in a triangular plane (fan pattern); others emit a light jet of water that spirals around quickly (cone pattern). Vents that deliver a greater flow rate lower the output pressure. Most vents attach directly to the trigger gun.
Some washers, with an apt nozzle, allow detergent to be introduced into the water stream, assisting in the cleaning process. There are two kinds of chemical injectors available — the first is a high-pressure injector which introduces the chemical after the water bequeaths the pump (a downstream injector) and a low-pressure injector that introduces the chemical before water enters the pump (an upstream injector). The type of injector used is dependent on the type of detergent used, as there are several chemicals which will damage a pump if an upstream injector is used.
Washers are hazardous tools and should be operated with due regard to safety instructions. The water pressure near the nozzle is strong enough to strip flesh from bone. Particles in the water supply are discharged from the nozzle at significant velocities. The cleaning process can propel objects dislodged from the surface being cleaned, also at high velocities. Pressure washers tend to break up tarmac if aimed directly at it, due to high-pressure water entering cracks and voids in the surface. That is why you need the service of a professional for your pressure washing.
Gas or Electric Pressure Washing
Most consumer washers are gas or electric powered. Electric washers plug into a regular outlet, are supplied with tap water, and typically deliver pressure up to about 2,000 psi. Gas washers can provide twice that pressure, but due to the hazardous nature of the engine exhaust, they do not fit for indoor or enclosed areas. Some models can produce hot water, which can be ideal for removing and loosening oil and grease.
Pressure washing only uses this process on concrete driveways, walkways, lightly on brickwork and wood surfaces.
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