Nozzle tip with slit valve for fluid dispenser
View Patent ↗An outlet valve assembly for a fluid dispenser of a type having a pump fluidically coupled to a fluid reservoir includes an outlet nipple having a proximal end configured to be fluidically coupled to the pump and a distal end opposite the proximal end. The outlet nipple defines a conduit extending in a flow direction and has an annular protrusion extending radially inwardly intermediate the proximal end and the distal end. An outlet nozzle is coaxially received within the distal end of the outlet nipple. A resiliently deformable valve member is received within the conduit. The valve member includes a valve head portion having one or more slits defining an orifice and a peripheral valve portion outward of the valve head portion. The peripheral valve portion is retained between the annular protrusion of the outlet nipple and an end edge surface of the outlet nozzle.
1. An outlet valve assembly for a fluid dispenser, the fluid dispenser having a pump fluidically coupled to a fluid reservoir, said outlet valve assembly comprising:
an outlet nipple having a proximal end configured to be fluidically coupled to the pump and a distal end opposite the proximal end, the outlet nipple defining a conduit extending in a flow direction and having an annular protrusion extending radially inwardly intermediate the proximal end and the distal end;
an outlet nozzle coaxially received within the distal end of the outlet nipple; and
a resiliently deformable valve member received within said conduit, said valve member including a valve head portion having one or more slits defining an orifice and a peripheral valve portion outward of said valve head portion, said peripheral valve portion retained between the annular protrusion of the outlet nipple and an end edge surface of the outlet nozzle.
2. The outlet valve assembly of claim 1 , further comprising:
said valve head portion having a first side and a second side opposite the first side, said first side being upstream of said second side in the flow direction; and
a vent-resisting member received within the conduit defined by the outlet nipple conduit, the vent-resisting member including a perforated baffle adjacent the first side of said valve head portion, wherein the baffle is positioned sufficiently close to the first side of said valve head portion so as to resist inward opening of said orifice during operation to prevent inward venting of ambient air during a dispensing operation.
3. The outlet valve assembly of claim 2 , wherein the first side of said valve head portion is spaced apart from said baffle.
4. The outlet valve assembly of claim 2 , wherein said vent-resisting member is integral with the outlet nipple.
5. The outlet valve assembly of claim 2 , wherein the vent resisting member includes an axially extending annular sidewall extending between the perforated baffle and a peripheral flange, and further wherein the peripheral flange is retained along with the peripheral valve portion between the annular protrusion of the outlet nipple and the end edge surface of the outlet nozzle.
6. The outlet valve assembly of claim 1 , wherein the outlet nozzle is secured within the outlet nipple via a friction fit.
7. The outlet valve assembly of claim 1 , further comprising one or both of:
one or more protrusions formed on an outward facing surface of the outlet nozzle engaging one or more complementary recesses formed on an inward facing surface of the outlet nipple; and
one or more protrusions formed on an inward facing surface of the outlet nipple engaging one or more complementary recesses formed on an outward facing surface of the outlet nozzle.
8. The outlet valve assembly of claim 1 , wherein said first surface of said valve head portion is generally convex.
9. The outlet valve assembly of claim 1 , wherein said valve member is formed of a material selected from silicone rubber, neoprene, chloroprene rubber, and ethylene propylene diene terpolymer (EPDM).
10. The outlet valve assembly of claim 1 , wherein said peripheral valve portion has a generally dovetailed cross-sectional shape.
11. The outlet valve assembly of claim 1 , wherein said valve peripheral portion is clamped between the annular protrusion of the outlet nipple and the end edge surface of the outlet nozzle to provide a sealing interference therebetween.
12. A fluid dispenser comprising a pump having a pump inlet fluidically coupled to a fluid reservoir and an outlet valve assembly, said outlet valve assembly comprising:
an outlet nipple having a proximal end configured to be fluidically coupled to the pump and a distal end opposite the proximal end, the outlet nipple defining a conduit extending in a flow direction and having an annular protrusion extending radially inwardly intermediate the proximal end and the distal end;
an outlet nozzle coaxially received within the distal end of the outlet nipple; and
a resiliently deformable valve member received within said conduit, said valve member including a valve head portion having one or more slits defining an orifice and a peripheral valve portion outward of said valve head portion, said peripheral valve portion retained between the annular protrusion of the outlet nipple and an end edge surface of the outlet nozzle.
13. The fluid dispenser of claim 12 , wherein said fluid reservoir is selected from the group consisting of a flexible non-vented container, a semi-rigid non-vented container, a rigid vented container, and a semi-rigid vented container.
14. The fluid dispenser of claim 12 , wherein said pump is selected from a tube pump and a dome pump.
15. The fluid dispenser of claim 12 , further comprising:
a housing for receiving said pump and fluid reservoir; and
a pump actuator on said housing.
16. The fluid dispenser of claim 12 , further comprising:
said valve head portion having a first side and a second side opposite the first side, said first side being upstream of said second side in the flow direction; and
a vent-resisting member received within the conduit defined by the outlet nipple conduit, the vent-resisting member including a perforated baffle adjacent the first side of said valve head portion, wherein the baffle is positioned sufficiently close to the first side of said valve head portion so as to resist inward opening of said orifice during operation to prevent inward venting of ambient air during a dispensing operation.
17. The fluid dispenser of claim 12 , wherein the first side of said valve head portion is spaced apart from said baffle.
18. The fluid dispenser of claim 12 , wherein said valve member is formed of a material selected from silicone rubber, neoprene, chloroprene rubber, and ethylene propylene diene terpolymer (EPDM).
19. The fluid dispenser of claim 12 , wherein said valve peripheral portion is clamped between the annular protrusion of the outlet nipple and the end edge surface of the outlet nozzle to provide a sealing interference therebetween.
20. The fluid dispenser of claim 12 , wherein the outlet nozzle is secured within the outlet nipple via any one or more of:
a friction fit;
one or more protrusions formed on an outward facing surface of the outlet nozzle engaging one or more complementary recesses formed on an inward facing surface of the outlet nipple; and
one or more protrusions formed on an inward facing surface of the outlet nipple engaging one or more complementary recesses formed on an outward facing surface of the outlet nozzle.