Anti-siphon control valve

Claim 1

An anti-siphon control valve for fluid flow comprising; an enclosed, elongated housing having a first end, a top end, an exterior wall, and an open interior; an inlet tube mounted within said housing, said tube having a first end secured within said first end of said housing, and a top end having an outlet port positioned within the interior of said housing intermediate said first and top ends thereof; said top end being cone-frustum shaped externally; an open/close valve in said inlet tube for controlling fluid flow through said inlet tube; said valve having an open position for providing for substantially unobstructed fluid flow through said inlet tube; means operatively connected to said open/close valve and extending outside said housing for controlling the operation of said open/close valve; a poppet valve assembly mounted to said top end of said housing, said assembly having vent openings therethrough, and the interior of said housing being selectively in communication with the atmosphere through said vent openings, said poppet valve assembly further comprising: a valve seat; a vertically movable poppet valve having an open position whereby said poppet valve seats against and closes said outlet port of said inlet tube when the fluid pressure in said inlet tube at said outlet port is less than or substantially equal to the fluid pressure in the interior of said housing between said outlet port and said housing wall, and whereby said poppet valve opens said outlet port of said inlet tube and engages said valve seat to close the interior of said housing to the atmosphere when the fluid pressure within said inlet tube adjacent said outlet port is greater than the fluid pressure in the interior of said housing adjacent and exterior to said outlet port; and said poppet valve is formed with a cup-faced side facing said outlet port, said cup-shaped side for selectively redirecting fluid flow in reverse direction around said inlet tube in the closed position, and for closing said outlet port in the open position; the shape of said cup-shaped side being such that no fluid escapes through said vent openings upon moving to the closed position; and an exit port in said housing wall adjacent said first end of said housing for fluid communication between the interior and exterior of said housing.