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Tuesday, December 22, 2009

Variable Displacement Flow Control

Rather than by speed control (changes in the number of displacements in a given period of time), flow may be varied by changing the volume displaced per stroke. Variable stroke are generally limited to small metering or controlled volume pumps. Although large capacity variable stroke pumps have been built, the complexity of the mechanism involved and the development of other effective and economical means of flow control have precluded their use.