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An animal watering valve has an elastomeric diaphragm disposed in a bore of a housing upstream of a valve seat and having apertures formed therethrough for the passage of water. A valve stem has a head clamped between the diaphragm and the valve seat and a tail that is laterally deflectable to move

An animal watering valve has an elastomeric diaphragm disposed in a bore of a housing upstream of a valve seat and having apertures formed therethrough for the passage of water. A valve stem has a head clamped between the diaphragm and the valve seat and a tail that is laterally deflectable to move the valve stem head relative to the diaphragm from a seated position. Upon moving it to an unseated position, the valve stem head pivots relative to the valve seat to permit water to flow out of the valve. At least portions of the flow aperture outlets in the diaphragm are located radially inwardly of and axially upstream of the upstream surface of the valve stem head.

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I claim: 1. An animal watering valve comprising: A. a housing which has a longitudinal bore formed therein having an upstream inlet and a downstream outlet; B. a valve seat which is disposed in said bore; C. an elastomeric diaphragm which is disposed in said bore upstream of said valve seat and whi

I claim: 1. An animal watering valve comprising: A. a housing which has a longitudinal bore formed therein having an upstream inlet and a downstream outlet; B. a valve seat which is disposed in said bore; C. an elastomeric diaphragm which is disposed in said bore upstream of said valve seat and which includes (1) a perforated portion having apertures formed therethrough that have outlets, and (2) a seat portion having a valve stem head abutment surface, wherein said diaphragm includes a body through which said apertures extend and a radially central protrusion which extends axially downstream from a downstream surface of said body to said abutment surface; and D. a valve stem which is located in said bore and which extends from said diaphragm toward said outlet, said valve stem having a head that is clamped between said diaphragm and said valve seat and a tail that is laterally deflectable to move said valve stem head relative to said diaphragm from a seated position in which said valve stem head seals against said valve seat to prevent water flow though said valve to an unseated position in which said valve stem head pivots relative to said valve seat to permit water to flow through said apertures in said diaphragm, between said valve stem head and said valve seat, and out of said valve, said valve stem head having an upstream surface that abuts said seat portion of said diaphragm, wherein at least portions of said flow aperture outlets are located radially inwardly of and axially upstream of said upstream surface of said valve stem head when the valve stem tail is in both the deflected and undeflected positions thereof. 2. The animal watering valve of claim 1, wherein said valve stem head has an outer radial peripheral surface that is free of contact from said diaphragm in the seated position of said valve stem head. 3. The animal watering valve of claim 1, wherein said upstream surface of said valve stem head is at least essentially planar. 4. The animal watering valve of claim 1, wherein said valve seat is an elastomeric ring that has an upstream surface contacting a downstream surface of said valve stem head. 5. The animal watering valve of claim 1, wherein said valve seat is an O-ring. 6. The animal watering valve of claim 1, wherein portions of said flow aperture outlets are located radially outwardly of said upstream surface of said valve stem head. 7. The animal watering valve of claim 1, wherein said protrusion is imperforate. 8. The animal watering valve of claim 1, wherein said downstream surface of said diaphragm body is at least essentially planar from an outer radial surface of said protrusion to an outer radial surface of said diaphragm, at least when said valve stem is in said unseated position thereof. 9. The animal watering valve of claim 1, wherein said body of said diaphragm has a recess formed in an upstream surface thereof having a diameter that is at least as large as a diameter of said protrusion, and wherein said recess at least partially collapses upon valve stem deflection. 10. The animal watering valve of claim 1, wherein radial deflection of said valve stem is constrained by engagement of said valve stem with an inner radial surface of said valve seat. 11. The animal watering valve as defined in claim 1, wherein said diaphragm includes a perforated web portion having a downstream surface which presents said seat portion and which has apertures formed therethrough, and a cylindrical peripheral portion which extends axially downstream from said web portion and which clamped in place within said valve housing. 12. The animal watering valve of claim 11, wherein an annular channel is formed in said perforated web portion of said diaphragm, extends around an outer radial periphery of said seat portion, and connects the outlets of said apertures to one another. 13. The animal watering valve of claim 12, wherein said perforated web portion includes an annular portion that is disposed radially between said channel and said cylindrical portion and that is located axially downstream of said seat portion, and wherein said channel has an outer peripheral surface that is inclined radially inwardly from an outer axial end portion thereof toward an inner axial end portion thereof. 14. The animal watering valve of claim 13, wherein said outer peripheral surface of said channel constrains radial deflection of said valve stem when said valve stem is in the unseated position thereof. 15. An animal watering valve comprising: A. a housing which has a longitudinal bore formed therein and which has an upstream inlet and a downstream outlet; B. an annular elastomeric valve seat which is disposed in said bore; C. an elastomeric diaphragm which is disposed in said bore upstream of said valve seat and which includes (1) a body having apertures formed therethrough, each of the apertures having an upstream inlet opening and a downstream outlet opening, and (2) an imperforate radially central protrusion which extends axially downstream from a downstream surface of said body and which forms a seat portion on a downstream end thereof; (D) a valve stem which is located in said bore and which extends from said diaphragm toward said outlet, said valve stem having a head that is clamped between said diaphragm and said valve seat and a tail that is laterally deflectable to move said valve stem head relative to said diaphragm from a seated position in which said valve stem head seals against said valve seat to prevent water flow though said valve to an unseated position in which water flows through said apertures of said diaphragm, between said valve stem head and said valve seat, and out of said valve, said valve stem head having an upstream surface that abuts said seat portion of said diaphragm, wherein at least portions of said flow aperture outlets are located radially inwardly of and axially upstream of said upstream surface of said valve stem head. 16. The animal watering valve of claim 15, wherein said downstream surface of said diaphragm body is at least essentially planar from an outer radial surface of said protrusion to an outer radial surface of said diaphragm, at least when said valve stem is in said seated position thereof. 17. The animal watering valve of claim 15, wherein said body of said diaphragm has a recess formed in an upstream surface thereof and having a diameter that is at least as large as a diameter of said protrusion, and wherein said recess at least partially collapses upon deflection of said valve stem from said seated position thereof to said unseated position thereof. 18. The animal watering valve as recited in claim 15, wherein radial deflection of said valve stem is constrained by engagement of said valve stem with an inner radial surface of said valve seat.