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A peristaltic pump, also commonly known as a roller pump, is a type of positive displacement pump used for pumping a variety of fluids. The fluid is contained in a flexible tube fitted inside a circular pump casing. Most peristaltic pumps work through rotary motion, though linear peristaltic pumps have also been made.
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The company diversified into pump manufacturing in 1990 when it bought Watson-Marlow. [6] It acquired the Jucker Industrial Division, an Italian controls business, in 1993, [7] Bredel Hose Pumps, a business manufacturing high-pressure hose pumps, in 1996 [8] and M&M International, an Italian piston actuated and solenoid valve business in 2001. [9]
The company was founded by Jerry Cole and John Parmer in 1955 and took up shop in a 1,200-square-foot (110 m 2) loft on West Illinois Street in downtown Chicago. [2] In the 1960s, Cole-Parmer acquired Masterflex peristaltic pumps, followed shortly by the purchases of Gilmont Instruments and Manostat Pumps.
Diaphragm pumps can also be made which discharge at fairly high pressure. Diaphragm metering pumps are commonly hydraulically driven. Peristaltic pumps use motor-driven rollers to roll along flexible tubing, compressing it to push forward a liquid inside. Although peristaltic pumps can be used to meter at lower pressures, the flexible tubing is ...
A common type of variable-displacement pump used in vehicle technology is the axial piston pump. This pump has several pistons in cylinders arranged parallel to each other and rotating around a central shaft. A swashplate at one end is connected to the pistons. As the pistons rotate, the angle of the plate causes them to move in and out of ...