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A pressure washer or power washer is a high-pressure mechanical sprayer used to remove loose paint, mold, grime, dust, mud, and dirt from surfaces and objects such as buildings, vehicles and concrete surfaces. The volume of a pressure washer is expressed in gallons or litres per minute, often designed into the pump and not variable. The pressure, expressed in pounds per square inch, pascals, or bar (deprecated but in common usage), is designed into the pump but can be varied by adjusting the unloader valve. Machines that produce pressures from 750 to 30,000 psi (5 to 200 MPa) or more are available. The basic pressure washer consists of a motor (either electric, internal combustion, pneumatic or hydraulic) that drives a high-pressure water pump, a high-pressure hose and a trigger gun-style switch. Just as a garden hose nozzle is used to increase the velocity of water, a pressure washer creates high pressure and velocity. The pump cannot draw more water from the pipe to which the washer is connected than that source can provide: the water supply must be adequate for the machine connected to it, as water starvation leads to cavitation damage of the pump elements. Different types of nozzle are available for different application. Some nozzles create a water jet that is in a triangular plane (fan pattern), others emit a thin jet of water that spirals around rapidly (cone pattern). Nozzles that deliver a higher flow rate lower the output pressure. Most nozzles attach directly to the trigger gun. Some washers, with an appropriate nozzle, allow detergent to be introduced into the water stream, assisting in the cleaning process. Two types of chemical injectors are available — a high-pressure injector that introduces the chemical after the water leaves 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 related to the type of detergent used, as there are many chemicals that will damage a pump if an upstream injector is used. 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. Particles in the water supply are ejected from the nozzle at great velocities. The cleaning process can propel objects dislodged from the surface being cleaned, also at great velocities. Pressure washers have a tendency to break up tarmac if aimed directly at it, due to high-pressure water entering cracks and voids in the surface. Most consumer washers are electric- or petrol-powered. Electric washers plug into a normal outlet, are supplied with tap water, and typically deliver pressure up to about 2,000 psi (140 bar). Petrol washers can deliver twice that pressure, but due to the hazardous nature of the engine exhaust they are unsuitable for enclosed or indoor areas. Some models can generate hot water, which can be ideal for loosening and removing oil and grease. ==Origin== The hot-water high-pressure washer was invented by Alfred Kärcher in 1950,〔(【引用サイトリンク】publisher=Kärcher )〕 but Frank Ofeldt in the United States claimed to have invented the steam pressure washer or "high-pressure Jenny" in 1927.〔(【引用サイトリンク】publisher=Jenny Products, Inc. )〕 ==Uses== At extreme high pressure, water is used in many industrial cleaning applications requiring the removal of surface layers and for dust-free cutting of some metals and concrete. For exterior applications, gas or propane powered washers provide greater mobility than electric ones, as they do not require use in proximity to an electrical outlet, but for indoor applications, electric washers produce no exhaust and are much quieter than gas or propane washers. The majority of pressure washers nowadays connect to an existing water supply, like a garden hose, but some models store water in an attached tank. Usually there is an on/off button that controls the water stream and many models allow you to adjust the water pressure. High-pressure water, in combination with special chemicals, aids in the removal of graffiti, especially when the water is hot, as a quick rinser of the softened graffiti. Sometimes a pressurized mixture of air and sand, or water and sand, is used to blast off the surface of the vandalized area, etching the surface and making it extremely difficult to use high-pressure cleaning as a follow-up process. Sandblasting as graffiti removal often over cleans a surface and is capable of leaving a permanent scar on the surface. Low-pressure washing is a common technique used in today's residential house washing market. Professional pressure washing contractors have used high pressure equipment in the past to clean residential homes, however, low-pressure, high volume pressure washing equipment has been introduced as an alternative along with the use of specific cleaning solutions to achieve effective cleaning with a very low possibility of damaging the property. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「pressure washer」の詳細全文を読む スポンサード リンク
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