Abstract: A tank for a pressure-assist toilet flush system includes a base having an outlet for discharging water from the tank and a cover connected to the upper end of the base at a tongue-and-groove joint. The base has a pair of first sidewalls extending downward from the upper end of the base along a length of the base, a pair of second sidewalls extending between the first sidewalls and downward from the upper end of the base, and a bottom wall connected to the first sidewalls and the second sidewalls, with the outlet defined in the bottom wall. The base also includes first and second cross-ribs connected to the first sidewalls and each having a bridge portion extending between the first sidewalls on opposite sides of the outlet, the first and second cross-ribs each having an opening between a bottom edge of the bridge portion and the bottom wall.

Abstract: A tank for a pressure-assist toilet flush system includes a base having an outlet for discharging water from the tank and a cover connected to the upper end of the base at a tongue-and-groove joint. The base has a pair of first sidewalls extending downward from the upper end of the base along a length of the base, a pair of second sidewalls extending between the first sidewalls and downward from the upper end of the base, and a bottom wall connected to the first sidewalls and the second sidewalls, with the outlet defined in the bottom wall. The base also includes first and second cross-ribs connected to the first sidewalls and each having a bridge portion extending between the first sidewalls on opposite sides of the outlet, the first and second cross-ribs each having an opening between a bottom edge of the bridge portion and the bottom wall.

Abstract: Pressure vessel components of a sensing element are formed from liquid crystal polymers. Individual LCP components may be ultrasonically adhered to one another to form a hermetic seal. In the preferred embodiment, a metal tube is hermetically sealed to a pressure vessel cup by molding an LCP resin around a cleaned and heated tube to form a hermetic seal. Also in the preferred embodiment, the sensing element includes a single convolution diaphragm formed under heat and pressure using a polyimide film.