How external circumferential piston pumps work
External Circumferential Piston (ECP) pumps are different to rotary lobe pumps.They operate on the circumferential piston principle whereby arc shaped rotor wings (pistons), travel in annular shaped cylinders machined in the pump body. This results in a long sealing path, wide inlet/outlet orifices and large fluid cavities.
In addition to this Waukesha Universal ECP pumps have rotor wings are manufacturered to extremly close tolerances from non gauling Alloy 88 and are designed with no cavity between the rotors, as is the case with rotary lobe pumps, to allow the passge of fluid.
The long sealing path reduces slippage and produces a smooth flow of product without destructive pulses or pressure peaks, and without valves or complex parts.
The wide orifices and large fluid cavity allow ECP pumps to handle large solids and abrasive liquids. The combination of these features means that ECP pumps offer
- no slippage on product over 200 cP.
- an extremely gental and smotth pumping action,
- the ability to handle viscous fluids of up to 200,000 cP,
- no galling or seizing.
- an increased priming capability.
The way Waukesha ECP pumps are manufactured allows them to be refubished using oversized rotors and slightly enlarged chambers to prolong their service life and do not suffer from the problem of timing slip as can often be experienced with rotary lobe pumps.
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