Anti-siphoning valve assembly and plumbing fixture including same

A plumbing fixture comprising:

• a faucet having a user operable valve for controlling fluid flow from a supply line to an outlet tube, and having a spout through which fluid can flow to produce an output stream;
• a coupling separated from said faucet and forming a chamber and having an inlet coupling the outlet tube to the chamber, an outlet coupling the spout to the chamber, said chamber extending linearly between said inlet and said outlet, and a vent passageway branching off rom said chamber and in fluid communication with the chamber and having a vent inlet in communication with ambient atmosphere and a vent outlet in fluid communication with and attached to said chamber;
• a back pressure check valve in fluid communication with said inlet passageway for restricting fluid flow through the inlet passageway to only a direction form the outlet tube into the chamber;
• and
• a vacuum breaker check valve located in said vent passageway in said coupling and including a valve member in close proximity to said vent passageway outlet and said chamber for closing said vent inlet when pressure in the chamber is greater than pressure at the vent inlet and for opening the vent inlet when pressure in the chamber is not greater than pressure at the vent inlet, and means for mounting said valve member in said vent passageway for minimizing the volume of liquid trapped between said chamber and said valve member.

A plumbing fixture comprising:

• a faucet having a user operable valve for controlling fluid flow from a supply line to an outlet tube, and having a spout through which fluid can flow to produce an output stream;
• a coupling forming a chamber and having an inlet passageway coupling the outlet tube to the chamber, an outlet passageway coupling the spout to the chamber, and a vent passageway in fluid communication with the chamber and having a vent inlet and a vent outlet in fluid communication with said chamber;
• a back pressure check valve in fluid communication with said inlet passageway for restricting fluid flow through the inlet passageway to only a direction from the outlet tube into the chamber;
• a first vacuum breaker check valve located in said vent passageway in said coupling and including a valve member for closing said vent inlet when pressure in the chamber is greater than pressure at the vent inlet and for opening the vent inlet when pressure in the chamber is not greater than pressure at the vent inlet;
• a ventilation housing having a ventilation inlet, a ventilation outlet, means for mounting said ventilation housing to a member separate from said coupling, and a second vacuum breaker check valve located in a ventilation passageway connecting said ventilation inlet to said ventilation outlet within said ventilation housing, said second vacuum breaker check valve including a second valve member for closing said ventilation inlet when pressure in the ventilation passageway is substantially greater than pressure at the ventilation inlet and for opening the ventilation inlet when pressure in the ventilation passageway is not greater than pressure at the ventilation inlet;
• and
• a vent hose connecting said vent inlet with said ventilation outlet, said first valve member and said second valve member located adjacent to opposite ends of said vent hose.