Patent ID: 6901881

Claim:
A drinker for a watering system of a poultry house; the drinker comprising: a housing having a side wall, a top, and a bottom defining a valve chamber; the chamber having an inner surface and a floor; an inlet to place the drinker chamber in communication with a supply of water; an outlet port extending through the bottom of said housing to allow water to exit said housing; said outlet port being defined by a side wall which slopes outwardly, such that the diameter at the bottom of the outlet opening is larger than the diameter at the top of the outlet opening; a valve seat in said chamber spaced axially above said outlet port; a valve member received within said chamber and movable between a first position in which said valve member engages said valve seat to close said outlet port to prevent the flow of water through said drinker and a second position in which said valve member is raised relative to said valve seat to open said outlet port to allow water to pass through said drinker; a pin extending through said outlet port; said pin having a shaft and a head on said shaft; said head having a circumference greater than said outlet port such that said head rests on said chamber floor; said head further comprising a side wall, an upper surface, and a cavity formed in said upper surface and defined by an edge and a cavity surface; said cavity surface having a shape different from the shape of said valve member; said pin being pivotally moveable relative to said housing to move said valve member from said closed position to said opened position; whereby, when said pin is pivoted said cavity edges move in an arc to engage said valve member to move said valve member from said closed position to said opened position, the movement of the valve member being dependent upon the amount of movement of the pin cavity edge.