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A pump comprising a housing and a flexible diaphragm mounted in the housing. A first region of the diaphragm partially defines a first pumping chamber, and the pumping chamber has an inlet and an outlet. A wobble plate drive is coupled to the first region of the diaphragm to provide a pumping action

A pump comprising a housing and a flexible diaphragm mounted in the housing. A first region of the diaphragm partially defines a first pumping chamber, and the pumping chamber has an inlet and an outlet. A wobble plate drive is coupled to the first region of the diaphragm to provide a pumping action in the pumping chamber. The wobble plate drive has a nutating axis, and the first region of the diaphragm lies radially outwardly of the nutating axis. The first region of the diaphragm has a generally annular ramp section which flexes when driven by the wobble plate drive to provide the pumping action, and the ramp section is wider radially at a location remote from the nutating axis than at a location nearer the nutating axis. The pump also has a single outlet valve arranged to serve multiple pumping chambers.

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A pump comprising: a housing; a flexible diaphragm mounted in said housing; means cooperating with a first region of the diaphragm to define a first pumping chamber, said pumping chamber having an inlet and an outlet; a wobble plate drive at least partially in said housing and subject to nutating mo

A pump comprising: a housing; a flexible diaphragm mounted in said housing; means cooperating with a first region of the diaphragm to define a first pumping chamber, said pumping chamber having an inlet and an outlet; a wobble plate drive at least partially in said housing and subject to nutating motion, said wobble plate drive being drivingly coupled to said first region of the diaphragm to provide a pumping action in said first pumping chamber; said wobble plate drive having a nutating axis and said first region of the diaphragm lying radially outwardly of the nutating axis; said first region of said diaphragm having a generally annular ramp section which flexes when driven by the wobble plate drive to provide said pumping action in the first pumping chamber; and said ramp section when unstressed by any external member being wider radially at a location remote from the nutating axis than at a location nearer the nutating axis.