Abstract: A pressure flushing system for use in a toilet tank includes a housing with a water inlet conduit, an air and water inlet assembly connected to the conduit and to the housing, and a water outlet for the housing. There is a flush valve within the housing for controlling flow of water from the inlet to the housing outlet. The air and water inlet assembly includes a chamber, with a water inlet connected to the chamber, and an outlet connected to the chamber. There is an air inlet accessible to air at atmospheric pressure and a passage between the air inlet and the chamber. A check valve is located in the passage, with the check valve opening in response to a venturi effect caused by water flow through the chamber to draw air into the chamber to mix with water flowing through the chamber and to the outlet. The check valve includes an elastomeric sleeve positioned within the passage and having normally closed flexible lips extending toward the chamber.

Abstract: A pressure flushing system for use within a toilet tank includes a pressure tank which has a predetermined volume. There is a water outlet for the tank, a water inlet for the tank, and an air inlet for the tank. The air inlet is associated with the water inlet whereby water flowing into the tank draws air into the tank. A portion of the tank is thus occupied by water and a portion is occupied by air, with the air applying pressure to the water. There is a valve within the tank which controls the flow of water from the tank through the outlet. The volume of water within the tank which may flow through the outlet at any one operation of the valve is limited by a dam which is located within the tank and surrounds the outlet.

Abstract: A pressure flush tank for toilets is formed and adapted to be located within a toilet enclosure and is preferably formed of a non-metallic material such as plastic. The pressure flush tank has an essentially rectangular vertical cross section and an essentially rectangular horizontal cross section, with the tank including an upper housing portion and a lower housing portion. There is a peripheral projection on the lower surface of the upper housing portion and a peripheral recess along a facing surface of the lower housing portion, with the projection being positioned within and ultrasonically welded to the recess. Each of the housing portions has side walls and end walls, with each housing portion having reinforcing interior walls extending between opposing side walls to provide strength and rigidity for the pressure flush tank.