Mixing valve

A mixing valve, comprising:

• a manifold defining a cold fluid inlet, a hot fluid inlet, a fluid outlet in fluid communication with the cold fluid inlet and the hot fluid inlet, a mixing chamber in fluid communication with the cold fluid inlet, the hot fluid inlet, and the fluid outlet, a first seat, and a second seat;
• a temperature-responsive device associated with a first sealing surface configured to engage with the first seat, and a second sealing surface configured to engage with the second seat, the temperature-responsive device being responsive to changes in temperature to adjust positioning of the first and second surfaces relative to the first and second seats, respectively, the positions of the first and second surfaces regulating the flow of cold and hot fluids to the mixing chamber;
• a first by-pass mechanism responsive to the pressure of cold fluid from the cold, fluid inlet to allow cold fluid to flow between the cold fluid inlet and the fluid outlet;
• and
• a second by-pass mechanism responsive to a temperature detected by the temperature-responsive device to allow cold fluid flow between the cold fluid inlet and the fluid outlet.

A method of supplying temperature-regulated fluid, comprising:

• flowing cold fluid from a cold fluid inlet of a manifold to a fluid outlet of the manifold through a first by-pass mechanism responsive to a pressure of cold fluid from the cold fluid inlet;
• and
• flowing cold fluid from the cold fluid inlet to the fluid outlet through a second by-pass mechanism responsive to a temperature of fluid flowing to the fluid outlet,
• wherein the cold fluid flows through the first and second by-pass mechanisms when a temperature-responsive device in the manifold malfunctions.

A method of supplying temperature-regulated fluid, comprising:

• flowing cold fluid from a cold fluid inlet to a fluid outlet through a first by-pass mechanism responsive to a pressure of cold fluid from the cold fluid inlet;
• and
• flowing cold fluid from the cold fluid inlet to the fluid outlet through a second by-pass mechanism responsive to a temperature of fluid flowing to the fluid outlet,
• wherein the cold fluid flows through the first and second by-pass mechanisms when flow of hot fluid to a hot fluid inlet is restricted during temperature-regulated operation.