Vented check valves, pumps and refill units with vented check valves
First Claim
Patent Images
1. A refill unit for a dispenser comprising:
- a container for holding a liquid;
a pump secured to the container;
the pump having a pump chamber;
an inlet check valve located upstream of the pump chamber;
the inlet check valve having an annular seal; and
a venting recess located in the annular seal;
wherein air in the pump chamber may pass through the venting recess in the annular seal and flow into the container;
wherein the venting recess depth is less than about 30% of the contact depth of the annular seal against a wall of the pump chamber.
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Accused Products
Abstract
Vented check valves, pumps and refill units for dispensers are disclosed herein. Some embodiments disclose a refill unit including a container for holding a liquid. A pump chamber is secured to the container. The pump chamber is defined at least in part by a one-way liquid inlet check valve, a one-way liquid outlet check valve and at least one wall. The volume of the pump chamber is movable between a first volume and a second volume. The inlet check valve includes a venting recess. The venting recess allows air to flow past the inlet check valve in the opposite direction of the flow of liquid into the liquid chamber.
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Citations
20 Claims
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1. A refill unit for a dispenser comprising:
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a container for holding a liquid; a pump secured to the container; the pump having a pump chamber; an inlet check valve located upstream of the pump chamber; the inlet check valve having an annular seal; and a venting recess located in the annular seal; wherein air in the pump chamber may pass through the venting recess in the annular seal and flow into the container; wherein the venting recess depth is less than about 30% of the contact depth of the annular seal against a wall of the pump chamber. - View Dependent Claims (7, 8, 9, 10, 11, 12, 13, 14)
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2. A refill unit for a dispenser comprising:
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a container for holding a liquid; a pump secured to the container; the pump having a pump chamber; an inlet check valve located upstream of the pump chamber; the inlet check valve having an annular seal; and a venting recess located in the annular seal; wherein air in the pump chamber may pass through the venting recess in the annular seal and flow into the container; wherein the venting recess depth is less than about 50% of the contact depth of the annular seal against a wall of the pump chamber.
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3. A pump comprising:
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a pump chamber; the pump chamber defined by a one-way liquid inlet check valve, a one-way liquid outlet check valve and at least one wall; the volume of the pump chamber movable between a first volume and a second volume; the inlet check valve having an annular seal and a venting recess; wherein the venting recess allows air to flow past the inlet check valve in the opposite direction of the flow of liquid into the pump chamber; wherein the venting recess depth is less than about 50% of the contact depth of the annular seal against a wall of the pump chamber.
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4. A pump comprising:
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a pump chamber; the pump chamber defined by a one-way liquid inlet check valve, a one-way liquid outlet check valve and at least one wall; the volume of the pump chamber movable between a first volume and a second volume; the inlet check valve having an annular seal and a venting recess; wherein the venting recess allows air to flow past the inlet check valve in the opposite direction of the flow of liquid into the pump chamber; wherein the venting recess depth is less than about 50% of the contact depth of the annular seal against a wall of the pump chamber.
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5. A refill unit comprising:
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a container for holding a liquid; a pump chamber secured to the container; the pump chamber defined at least in part by a one-way liquid inlet check valve, a one-way liquid outlet check valve and at least one wall; the volume of the pump chamber movable between a first volume and a second volume; the inlet check valve having a venting recess; wherein the venting recess is located in a portion of the inlet check valve that contacts a wall to form a one-way seal; wherein the venting recess allows air to flow past the inlet check valve in the opposite direction of the flow of liquid into the pump chamber.
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6. A refill unit for a dispenser comprising:
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a container for holding a liquid; a pump secured to the container; the pump having a pump chamber; an inlet check valve located upstream of the pump chamber; the inlet check valve having an annular seal; and a venting recess located in the portion of the annular seal that seals against a wall; wherein air in the pump chamber may pass through the venting recess in the annular seal and flow into the container.
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15. A pump comprising:
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a pump chamber; the pump chamber defined by a one-way liquid inlet check valve, a one-way liquid outlet check valve and at least one wall; the volume of the pump chamber movable between a first volume and a second volume; the inlet check valve having a venting recess; wherein the venting recess is located in a portion of the inlet check valve that contacts a wall to form a one-way seal; wherein the venting recess allows air to flow past the inlet check valve in the opposite direction of the flow of liquid into the pump chamber. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification