Invention Grant
US08528792B2 Telescopic piston for pump 有权
泵用伸缩活塞

Telescopic piston for pump
Abstract:
A piston pump dispenser in which a volume in a compartment defined inside a piston chamber-forming member and between axially spaced discs on a piston varies with movement of the piston in a cycle of operation due to the piston having a portion between the discs which varies in length.
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