Alfred Kärcher SE & Co. KG is a German family-owned company that operates worldwide and is known for its high-pressure cleaners, floor care equipment, parts cleaning systems, wash water treatment, military decontamination equipment and window vacuum cleaners.
Headquartered in Winnenden, Germany, it produces both cleaning equipment and full cleaning systems. The company is the world market leader in cleaning technology and employs more than 10,000 people worldwide. In 2017 it posted sales revenues of €2.5 billion ($2.88 billion) and sold more than 13 million machines. Kärcher has 100 subsidiaries in 60 countries. In 2020, Kärcher established its North American headquarters in Aurora, Colorado.
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A piston is a component of reciprocating engines, reciprocating pumps, gas compressors, hydraulic cylinders and pneumatic cylinders, among other similar mechanisms. It is the moving component that is contained by a cylinder and is made gas-tight by piston rings. In an engine, its purpose is to transfer force from expanding gas in the cylinder to the crankshaft via a piston rod and/or connecting rod. In a pump, the function is reversed and force is transferred from the crankshaft to the piston for the purpose of compressing or ejecting the fluid in the cylinder. In some engines, the piston also acts as a valve by covering and uncovering ports in the cylinder.
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