DTV Drain Tempering Valve

Operation – How the Tempering Water Valve Works

The tempering water valve (DTV drain tempering valve) is designed to automatically cool high-temperature effluent before it enters the drain, ensuring compliance with plumbing codes and protecting infrastructure.

Installed directly into the drain line, the DTV features a thermal actuator that monitors the temperature of the discharge. When the effluent exceeds the valve’s set point, the actuator responds by opening a cold-water inlet, allowing water to mix with the hot discharge and reduce its temperature to a safe level— below 140°F.

As the effluent cools, the valve gradually modulates to reduce the flow of cold water. When the temperature drops approximately 10°F below the valve’s activation point, the cold-water inlet closes completely to conserve water.

This fully automatic operation makes the DTV a compact, reliable, and cost-effective solution for tempering hot water discharge. It helps prevent damage to plumbing systems, minimizes the risk of injury, and avoids costly code violations or fines.

Installations

Choosing Your Size

The DTV valves are available with ½”, ¾”, and 1′′ NPT water connections. To choose the valve right for your system you will need to calculate your Cv. Refer to our DTV FLOW CALCULATOR for assistance.

Recommended Accessories

For DTV installations, most local plumbing codes will require the installation of a check valve or backflow preventer to isolate the drain line from the potable water. A water hammer arrestor must be installed between the DTV and the check valve/backflow preventer if a check valve or backflow preventer is used. Failure to do so may cause permanent damage to the DTV and void the warranty.

ThermOmegaTech offers an optional water hammer arrestor and backflow preventers to make life easier. Contact us or your local representative for more information on these products.

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