Variable stroke pumping apparatus suitable for pumping chemicals in a pulseless manner irrespective of the stroke. The apparatus comprises a plurality of pumps connected in flow paths extending between a fluid inlet and outlet and a central housing containing a cam and cam follower devices mounted on a carrier which is pivotable to alter the stroke of the pumps while maintaining substantially constant aggregate pumping of the pumps. Pump reciprocating members for each pump, e.g. rams extend outwardly of the housing and are reciprocated by the cam follower devices.
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