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US 2006/0231577 A1Published application
Viscous liquid dispensing pump
OwnerDavid James Powling, Jesus-Maria Zubillagainventors
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OwnerDavid James Powling, Jesus-Maria Zubillagainventors
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A dispensing pump (12) for a viscous liquid comprises a cylinder (16), a piston (24) mounted for reciprocation within said cylinder (16), an inlet (50) for admitting liquid to be dispensed into said cylinder (16) and a ball check valve (52) arranged selectively to open and close said inlet opening. The ball valve (52) is retained in position by a spring (58) having a variable diameter. The piston (24) has a dispensing passage (40) in fluid communication with said cylinder (16) and with a self sealing dispensing valve (38). The pump (12) further comprises a sliding cut-off valve (70) arranged selectively to open and close fluid communication between the piston dispensing passage (40) and the cylinder (16) as the piston (24) reciprocates within the cylinder (16).
A dispensing pump for a viscous liquid comprising:
A pump as claimed in any of claims 2 to 5 wherein the cut-off valve member comprises a radially outer wall for engaging the inner surface of the cylinder and a radially inner wall for engaging the piston.
A pump as claimed in any preceding claim wherein the check valve comprises a ball valve comprising a ball received upon a valve seat.
A pump as claimed in any preceding claim wherein the dispensing valve is a self-sealing valve.
A pump as claimed in any preceding claim comprising an air vent which allows air to enter a reservoir receiving the pump around the pump piston.
A dispenser for viscous liquids comprising a reservoir for the liquid to be dispensed and a dispensing pump as claimed in any preceding claim arranged to dispense liquid from the reservoir.
Dependencies are inferred from the claim text.