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Difference between revisions of "Positive Displacement Pumps"
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Positive Displacement Pumps (view source)
Revision as of 04:07, 15 March 2012
, 04:07, 15 March 2012no edit summary
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'''Drawbacks:''' Positive displacement rotary pumps also have their weaknesses. Because of the nature of the pump, the clearance between the rotating pump and the outer edge must be very close, requiring that the pumps rotate at a slow, steady speed. If rotary pumps are operated at high speeds, the powders will cause erosion. Rotary pumps that experience such erosion eventually show signs of enlarged clearances, which allow powder to slip through and reduce the efficiency of the pump. | '''Drawbacks:''' Positive displacement rotary pumps also have their weaknesses. Because of the nature of the pump, the clearance between the rotating pump and the outer edge must be very close, requiring that the pumps rotate at a slow, steady speed. If rotary pumps are operated at high speeds, the powders will cause erosion. Rotary pumps that experience such erosion eventually show signs of enlarged clearances, which allow powder to slip through and reduce the efficiency of the pump. | ||
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Typical reciprocating pumps are: | Typical reciprocating pumps are: | ||
* [[Plunger Pumps]] - a reciprocating plunger pushes the powder through one or two open valves, closed by suction on the way back. | * [[Plunger Pumps]] - a reciprocating plunger pushes the powder through one or two open valves, closed by suction on the way back. | ||
* | * [[Diaphragm Pumps]] - similar to plunger pumps, where the plunger pressurizes hydraulic oil which is used to flex a diaphragm in the pumping cylinder. | ||
==== Various Positive Displacement Pumps ==== | ==== Various Positive Displacement Pumps ==== | ||
The positive displacement principle applies in the following types of pumps: | The positive displacement principle applies in the following types of pumps: | ||
* [[Progressive Cavity Pumps]] | * [[Progressive Cavity Pumps]] | ||
* [[Diaphragm Pumps]] | * [[Diaphragm Pumps]] | ||
* [[Screw Pumps]] | * [[Screw Pumps]] | ||
* [[Peristaltic Pumps]] | * [[Peristaltic Pumps]] | ||