Valve Assemblies for Water Heating Systems

A valve assembly, comprising:

• a valve comprising:
• an inlet port configured to receive a supply of cold water;
• a valve stack configured to receive the cold water from the inlet port, wherein the valve stack comprises:
• a first disc and a second disc, wherein the first disc is configured to axially rotate relative to the second disc;
• and
• a shaft connected to the first disc;
• and
• an actuator assembly comprising an actuator connected to the first disc via the shaft, wherein the actuator is configured to cause an axial rotation of the first disc relative to the second disc;
• a mixer in fluid communication with the valve and an external water tank configured to store hot water, wherein the mixer is configured to receive the hot water from the external water tank;
• and
• a shunt,
• wherein the valve is connected with the mixer via the shunt, wherein the valve stack is configured to control a flow of cold water to at least one of the mixer or the external water tank based on a position of the first disc relative to the second disc when the first disc is axially rotated, wherein the valve is configured to supply the flow of cold water to the mixer via the shunt, and wherein the mixer is configured to blend the cold water received from the valve and the hot water received from the external water tank and output a blended water.

A water heating system, comprising:

• a water tank configured to store hot water;
• a valve comprising:
• an inlet port configured to receive a supply of cold water;
• and
• a valve stack configured to receive the cold water from the inlet port, wherein the valve stack comprises:
• a first disc and a second disc in contact with each other, wherein the first disc is configured to axially rotate relative to the second disc;
• and
• a shaft connected to the first disc;
• and
• an actuator assembly comprising an actuator connected to the first disc via the shaft, wherein the actuator is configured to cause an axial rotation of the first disc relative to the second disc;
• a mixer in fluid communication with the valve and the water tank, wherein the mixer is configured to receive the hot water from the water tank;
• and
• a shunt,
• wherein the valve is connected with the mixer via the shunt, wherein the valve stack is configured to control a flow of cold water to at least one of the mixer or the water tank based on a position of the first disc relative to the second disc when the first disc is axially rotated, wherein the valve is configured to supply the flow of cold water to the mixer via the shunt, and wherein the mixer is configured to blend the cold water received from the valve and the hot water received from the water tank, and output a blended water.