A fluid dispensing valve is provided with a peripheral mounting portion and a connecting sleeve connecting the peripheral mounting portion with a head which defines a dispensing orifice. The valve head includes a central inner surface portion that bulges axially inwardly to project from a radially o
A fluid dispensing valve is provided with a peripheral mounting portion and a connecting sleeve connecting the peripheral mounting portion with a head which defines a dispensing orifice. The valve head includes a central inner surface portion that bulges axially inwardly to project from a radially outer surface portion.
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What is claimed is: 1. A fluid dispensing valve having a generally circular configuration relative to a longitudinal axis along which a fluid substance can be dispensed from said valve in a discharge flow direction, said valve having an axially outward direction that is defined by said discharge fl
What is claimed is: 1. A fluid dispensing valve having a generally circular configuration relative to a longitudinal axis along which a fluid substance can be dispensed from said valve in a discharge flow direction, said valve having an axially outward direction that is defined by said discharge flow direction, and said valve having an axially inward direction that is defined as the direction opposite to said axially outward direction, said valve comprising: (A) a peripheral mounting portion; (B) a valve head that is flexible and resilient, said valve head having (1) a normally closed orifice that is defined by at least one slit and that can open to permit a discharge flow of said substance, (2) a fully retracted, closed position that is axially inward of at least another part of said valve, (3) an exterior surface which (a) can interface with the environment on the valve exterior, and (b) has a generally recessed configuration as viewed from the valve exterior when said valve head is in the fully retracted, closed position, and (4) an interior surface which (a) can interface with a fluid substance on the valve interior, (b) has a radially outer surface portion with a convex arcuate configuration when viewed from the valve interior when said valve head is in the fully retracted, closed position, and (c) has a central inner surface portion that (i) is radially inside said radially outer surface portion, (ii) bulges axially inwardly to project from said radially outer surface portion, and (iii) has a convex arcuate configuration when viewed from the valve interior when the valve is in the fully retracted, closed position, and (5) a thickness between said exterior surface and said interior surface central inner surface portion that is thicker at the center on the longitudinal axis than the thickness of said head at the circumference of said interior surface central inner surface portion; and (C) a connector sleeve that (1) is flexible and resilient, (2) defines a generally tubular shape over at least part of the sleeve length, and (3) extends between, and connects, said peripheral mounting portion and said valve head in a configuration that, when said valve is subjected to a sufficient pressure differential, doubles over and extends rollingly in said axially outward direction as said valve head moves from said fully retracted, closed position to an extended position that is axially outward of said fully retracted, closed position and that accommodates opening of said orifice. 2. The fluid dispensing valve in accordance with claim 1 in which said valve head orifice is defined by a pair of intersecting slits, each said slit extending completely through the thickness of said valve head, and each said slit extending radially outwardly to at least said radially outer surface portion of said interior surface of said valve head. 3. The fluid dispensing valve in accordance with claim 1 in which said connector sleeve is defined at least in part by a generally tubular wall; and said tubular wall, as viewed in longitudinal cross section along a plane containing said longitudinal axis, has a generally J-shaped cross section when the valve is positioned so that said longitudinal axis is vertically oriented with said valve head up and with said peripheral mounting portion down. 4. The fluid dispensing valve in accordance with claim 1 in which said connector sleeve is defined by a generally tubular wall having a generally uniform cross section. 5. The fluid dispensing valve in accordance with claim 1 in which said valve head exterior surface lies on a partially spherical locus that defines a circular arc in longitudinal cross section as viewed along a plane containing said longitudinal axis. 6. The fluid dispensing valve in accordance with claim 1 in which said valve head interior surface radially outer surface portion is a partially spherical surface that defines a circular arc as viewed in longitudinal cross section along a plane containing said longitudinal axis. 7. The fluid dispensing valve in accordance with claim 1 in which said valve head interior surface central inner surface portion is a partially spherical surface defining a circular arc when viewed in transverse cross section along a plane containing said longitudinal axis. 8. The fluid dispensing valve in accordance with claim 7 in which said valve head interior surface central inner surface portion circular arc has a radius, and said valve head exterior surface lies on a partially spherical locus defining a circular arc having a radius that is slightly larger than the radius of said valve head interior surface central inner surface portion. 9. The fluid dispensing valve in accordance with claim 1 in which the outer diameter of said valve head interior surface central inner surface portion is between about 10% and about 66% of the outer diameter of said valve head interior surface radially outer surface portion. 10. The fluid dispensing valve in accordance with claim 1 in which said valve head interior surface central inner surface portion projects in the axially inward direction beyond the radially outermost edge of said valve head interior surface central inner surface portion by a distance which is between about 5% and about 25% of the outer diameter of said valve head interior surface central inner surface portion. 11. The fluid dispensing valve in accordance with claim 1 in which said valve head is thicker at the center along the longitudinal axis than at the circumference of said valve head interior surface central inner surface portion; and said valve head interior surface central inner surface portion bulges in the axially inward direction from its circumference by an amount that is between about 25% and about 75% of the thickness of said valve head at the center on the longitudinal axis. 12. The fluid dispensing valve in accordance with claim 1 further including its combination with a baffle plate disposed axially inwardly of, and spaced from, said valve head central inner surface portion. 13. The fluid dispensing valve in accordance with claim 12 in which said baffle plate is a unitary part of a retaining ring which can be used to hold said valve peripheral mounting portion in a closure. 14. The fluid dispensing valve in accordance with claim 12 in which said baffle plate has a frustoconical annular wall tapering to, and connected with, a generally flat, circular bottom wall. 15. The fluid dispensing valve in accordance with claim 12 in which flow apertures are defined around said baffle plate in said retaining ring for admitting flow of said fluid substance at the periphery of said valve head and at the interior side of said connector sleeve. 16. The fluid dispensing valve in accordance with claim 12 in which said orifice is defined by a plurality of intersecting slits which each extend laterally from the point of intersection of the slits to a radially outer end terminating in the valve head; and said baffle plate extends laterally beyond said radially outer end of each said slit. 17. The fluid dispensing valve in accordance with claim 12 in which the axial direction spacing between said valve head and said baffle plate is less than the diameter of said central inner surface portion of said valve head interior surface. 18. The fluid dispensing valve in accordance with claim 12 in which the axial direction spacing between said valve head and said baffle plate is less than the diameter of circular locus defined by the greatest radial extent of said slits from said intersection point of said slits at said longitudinal axis.
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