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Heleshaw pump principle

Variable delivery pumps can run continuously in one direction, but have the capability of an infinitely changeable discharge from zero to a maximum either way. Principle of operation is based on altering the
stroke of the pump pistons in radial or axial cylinders, by means of a floating ring or swash plate respectively. There is very little shock during starting of delivery or end as pump stroke increases gradually and also at end it tapers of gradually.
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