08-06-2017, 10:59 AM
Pressure washing or pressure washing is the use of high pressure water spray to remove loose paint, mold, dirt, dust, mud, chewing gum and dirt from surfaces and objects such as buildings, vehicles and concrete surfaces. The volume of a mechanical pressure washer is expressed in gallons or liters per minute, often designed in the pump and not variable. The pressure, expressed in pounds per square inch, pascals or bar, is designed inside the pump, but can be varied by adjusting the discharge valve. Machines that produce pressures of 750 to 30,000 psi (5 to 200 MPa) or more are available.
The high pressure hot water washer was invented by Alfred Kärcher in 1950, but Frank Ofeldt in the United States claimed to have invented the steam pressure washer or "Jenny High Pressure" in 1927.
The base pressure washer consists of a motor (electric, internal combustion, pneumatic or hydraulic) that drives a high pressure water pump, a high pressure hose and a trigger switch. Just as a garden hose nozzle is used to increase water velocity, a pressure washer creates high pressure and speed. The pump can not draw more water from the pipe to which the washer is connected than the source can provide: the water supply must be suitable for the machine connected to it, since starvation of water causes cavitation damage of the elements of the bomb.
There are different types of nozzles available for different applications. Some nozzles create a stream of water that is in a triangular plane (fan model), others emit a stream of fine water that spins quickly (cone pattern). Nozzles offering a higher flow rate lower the outlet pressure. Most nozzles connect directly to the trigger gun.
Some washers, with a suitable nozzle, allow to introduce detergent in the stream of water, helping in the cleaning process. There are two types of chemical injectors available: a high pressure injector that introduces the chemical after the water exits the pump (a downstream injector) and a low pressure injector that introduces the chemical before the water enters In the pump. 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 must be operated with safety instructions in mind. The water pressure near the nozzle is powerful enough to remove flesh from the bone. The particles in the water supply are expelled from the nozzle at high speeds. The cleaning process can propel objects dislodged from the surface being cleaned, even at high speeds. Pressure washers have a tendency to break asphalt if they are directed directly at it, because high pressure water enters cracks and voids at the surface.
Most of the washers are electric or gasoline. The electric washers are connected to a standard electrical outlet, supplied with tap water, and typically deliver a pressure of up to 2,000 psi (140 bar). Gasoline washers can deliver twice that pressure, but because of the dangerous nature of the engine exhaust they are inadequate for enclosed or indoor areas. Some models can generate hot water, which can be ideal for loosening and removing oil and grease.
The high pressure hot water washer was invented by Alfred Kärcher in 1950, but Frank Ofeldt in the United States claimed to have invented the steam pressure washer or "Jenny High Pressure" in 1927.
The base pressure washer consists of a motor (electric, internal combustion, pneumatic or hydraulic) that drives a high pressure water pump, a high pressure hose and a trigger switch. Just as a garden hose nozzle is used to increase water velocity, a pressure washer creates high pressure and speed. The pump can not draw more water from the pipe to which the washer is connected than the source can provide: the water supply must be suitable for the machine connected to it, since starvation of water causes cavitation damage of the elements of the bomb.
There are different types of nozzles available for different applications. Some nozzles create a stream of water that is in a triangular plane (fan model), others emit a stream of fine water that spins quickly (cone pattern). Nozzles offering a higher flow rate lower the outlet pressure. Most nozzles connect directly to the trigger gun.
Some washers, with a suitable nozzle, allow to introduce detergent in the stream of water, helping in the cleaning process. There are two types of chemical injectors available: a high pressure injector that introduces the chemical after the water exits the pump (a downstream injector) and a low pressure injector that introduces the chemical before the water enters In the pump. 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 must be operated with safety instructions in mind. The water pressure near the nozzle is powerful enough to remove flesh from the bone. The particles in the water supply are expelled from the nozzle at high speeds. The cleaning process can propel objects dislodged from the surface being cleaned, even at high speeds. Pressure washers have a tendency to break asphalt if they are directed directly at it, because high pressure water enters cracks and voids at the surface.
Most of the washers are electric or gasoline. The electric washers are connected to a standard electrical outlet, supplied with tap water, and typically deliver a pressure of up to 2,000 psi (140 bar). Gasoline washers can deliver twice that pressure, but because of the dangerous nature of the engine exhaust they are inadequate for enclosed or indoor areas. Some models can generate hot water, which can be ideal for loosening and removing oil and grease.