Apparatus for supplying pressurized rinse water to a toilet

A vacuum toilet for use with a supply of rinse fluid, the supply of rinse fluid being gravity fed to the vacuum toilet, and a source of pressurized air, the toilet comprising:

• a bowl for receiving waste material and having an outlet;
• a vacuum source connected to the outlet of the bowl by a sewer pipe;
• a waste discharge valve disposed in the sewer pipe and operable between open and closed positions;
• an enclosed reservoir;
• a rinse fluid inlet branch attached to the reservoir and in fluid communication with the supply of rinse fluid, a rinse fluid inlet valve disposed in the rinse fluid inlet branch being normally open, the rinse fluid inlet valve automatically operable to close, thereby preventing fluid flow out of the reservoir;
• a vent branch attached to the reservoir and open to atmosphere, a vent discharge valve disposed in the vent branch and operable between open and closed positions;
• an air inlet branch attached to the reservoir and in fluid communication with the source of pressurized air, an air inlet valve disposed in the air inlet branch and operable between open and closed positions;
• a rinse fluid outlet branch attached to the reservoir and in fluid communication with the toilet bowl, a rinse fluid discharge valve disposed in the rinse fluid outlet branch and operable between open and closed positions;
• and
• a controller for selectively operating the vent discharge valve, air inlet valve, rinse fluid outlet valve, and waste discharge valve, wherein the vent discharge valve is normally open and the air inlet valve, the rinse fluid outlet valve, and the waste discharge valve are normally closed to allow the reservoir to fill with rinse fluid, the controller being triggerable to move the vent discharge valve to the closed position and move the air inlet valve to the open position to thereby pressurize the rinse fluid in the reservoir, the controller also moving the rinse fluid discharge valve to the open position to send the pressurized rinse fluid to the toilet bowl and the waste discharge valve to the open position to evacuate the bowl.

Apparatus for supplying pressurized water to a bowl of a toilet, the apparatus adapted for use with a supply of water, the supply of water being gravity fed to the apparatus, and a source of pressurized air, the apparatus comprising:

• an enclosed reservoir;
• a water inlet branch attached to the reservoir and in fluid communication with the supply of water, a first check valve disposed in the water inlet branch and oriented to allow water flow into the reservoir while preventing water flow out of the reservoir;
• a three-way valve having a first port attached to the reservoir by a dual-function branch, a second port open to atmosphere, and a third port in fluid communication with the source of pressurized air, a valve member of the three-way valve operable between a normal position which establishes communication between the first port and the second port and an actuated position which establishes communication between the first port and the third port;
• a second check valve disposed in the dual-function branch and oriented to allow air flow out of the reservoir while preventing water flow out of the reservoir;
• a water outlet branch attached to the reservoir and in fluid communication with the toilet bowl, a water discharge valve disposed in the rinse fluid outlet branch and operable between open and closed positions;
• and
• a controller for selectively operating the three-way valve and water outlet valve, wherein the three-way valve is initially in the normal position and the water outlet valve is normally in the closed position to allow the reservoir to fill with water, the controller being triggerable to move the three-way valve to the actuated position to thereby pressurize the rinse fluid in the reservoir, the controller also moving the water discharge valve to the open position to send the pressurized water to the toilet bowl.