Over the ensuing years, eccentric disc pumps have established a well-earned reputation for consistently and reliably meeting the edicts of many hygienic regulatory standards, including EC 1935/2004, because they do not need mechanical or dynamic seals in order to operate.
Petit’s revolutionary eccentric disc pump technology features a disc that is placed inside a pump cylinder. The disc is driven by an eccentric bearing that is installed on the pump shaft. This creates four distinct pumping chambers that increase and decrease in volume as the disc is rotated by the eccentric bearing, producing both suction and discharge pressures as the chambers move in pairs that are 180 degrees apart. This ingenious method of operation ensures that the fluid passes through the pump at a constant and regular flow rate.
An Immediate Hit – The Sucess–Story of Eccentric Pumps
Eccentric disc pumps were an immediate hit in many markets and applications, and prompted Petit to form Mouvex. Headquartered today in Auxerre, France, Mouvex continues to remain the recognized global leader in manufacturing and supplying pumps for use in applications that require constant flow rates, leak-free operation and the ability to perform in difficult or product-sensitive applications.
Eccentric disc pumps do not need mechanical seals because, even though they are driven by a standard rotating drive, the off-center shaft that rotates the disc allows each point of the disc to move at the same speed. This means that the drive end of the pump’s shaft is located on a different plane than the tip end of the shaft that actually drives the pumping mechanism. Attached to the shaft are bearings that are enclosed in a hermetically sealed metal bellows or rubber boot. So, when the shaft rotates, the bellows or rubber boot does not rotate, but, rather, flexes in an eccentric circle.
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