Patent ID: 9085878
Filing Date: 2015-07-21
Classification: E03B,Y10T

Abstract:
1. A sanitary yard hydrant, comprising, an elongated pipe having upper and lower ends, said lower end being adapted for connection to a source of water under pressure and the upper end being adapted to be in fluid communication with an above ground outlet of water from the source of water; a control valve operatively connected to said pipe to control the flow of fluid in said pipe and being operable between open and closed positions; a water storage chamber adapted to be disposed below the frost line; a drain port associated with said pipe for allowing fluid in said pipe above said drain port to drain downwardly and outwardly from said pipe into the storage chamber when the control valve is closed; a passageway between the storage chamber and an opening port in the pipe above the drain port; a one way check valve disposed in the passageway for permitting flow from the storage chamber to the pipe when the control valve is open but not permitting flow from the pipe to the storage chamber; a venturi disposed in the pipe, the venturi having a fluid passage opening which tapers from a first size at a bottom portion thereof to a smaller size at a top portion thereof, the top portion of the venturi forming a venturi exit when the control valve is open so that water can flow through the control valve, through the pipe, through the venturi, and out the above ground outlet; and the opening port in the pipe above the drain hole being adjacent the exit of the venturi so that turbulence caused by the venturi at the venturi exit when the control valve is open will create a lowered pressure at the opening port in the pipe above the drain hole, thereby creating a greater pressure difference between pressure of the water in the storage chamber and the pressure at the opening port in the pipe adjacent the exit of the venturi when the control valve is open than the pressure difference would be between the pressure in the storage chamber and the pressure at the opening port if the venturi was not present when the control valve is open.