Water conservation recirculation system

• US 5,511,579 A
• Filed: 12/19/1994
• Issued: 04/30/1996
• Est. Priority Date: 02/18/1994
• Status: Expired due to Term

• Current Assignee: Temtrol Delta T Incorporated
• Original Assignee: Temtrol Delta T Incorporated
• Inventors: Price, William D.
• Primary Examiner(s): CHAMBERS, A MICHAEL
• Application Number:
  US08/359,053
• Time in Patent Office: 498 Days
• Field of Search: 137/337, 126/362, 417/12, 417/32
• US Class Current: 137/337
• CPC Class Codes: F24D 17/0078 Recirculation systems
• CPC Class Codes: Y10T 137/6497 Hot and cold water system having a connection from the hot to the cold channel

Abstract

The present invention is a water conservation system that provides instant hot water at a user'"'"'s sink. The system includes a backflow line positioned between the cold water line and a thermal switch. A check valve is placed in the backflow line to prevent hot water from entering the cold water supply. A thermal switch that contacts the flow of water is used to give a more accurate measurement of the hot water temperature. This system prevents large quantities of warm water from being pumped into the cold water supply.

Claims

1. A water recirculation system comprising:

a hot water source and a cold water source;

a hot water delivery line connected between said hot water source and at least one plumbing fixture;

a cold water delivery line connected between said cold water source and said plumbing fixture;

said hot water delivery line and said cold water delivery line being in communication with each other through a recirculation line;

said recirculation line including a pump and a temperature control switch, wherein said pump is activated by said temperature control switch when the temperature of the water in said recirculation line falls below a preselected value;

a backflow line connecting said cold water delivery line to said recirculation line so a portion of the water from the cold water line flows past said temperature control switch, wherein a portion of the water moved by said pump towards the cold water delivery line is also directed into said backflow line; and

a directional valve positioned in said backflow line so that water can only flow from the cold water delivery line to the temperature control switch.

2. The water recirculation system of claim 1 wherein said plumbing fixture is a faucet.

3. The water recirculation system of claim 1 wherein said backflow line is in communication with said cold water line through a needle valve.

4. The water recirculation system of claim 1 wherein said recirculation line further comprises a solenoid valve that opens only when said pump is activated.

5. The water recirculation system of claim 1 wherein said temperature control switch directly contacts the water in the recirculation line.

6. The water recirculation system of claim 1 wherein the temperature control switch is in a housing, and said housing has an agitator wall that directs water to the central part of the temperature control switch.

7. The water recirculation system of claim 6 wherein said agitator wall is positioned perpendicular to the path of the water.