The tempering watervalve (DTVdrain 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.
Effluent tempering capacity limited only by cold water flow rate through DTV
Benefits
Self-operating – no external power source required
Compliant with drain temperature limitations of plumbing codes
Prevents damage to PVC piping due to
over-temperature conditions
Minimizes water waste
Easy to install
Adaptable to almost any drain size
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.
The TV/HAT-RA (reverse acting, heat actuated trap valve with tube fittings) is a thermal relief valve that should be installed as close to the pump casing as possible to automatically and continuously control the cooling media within the system to maintain the desired temperature. Since it is what we classify as reverse-acting, the valve will open when the fluid temperature rises to the valve’s set point.
As the fluid temperature increases to within the operating range of the TV/HAT-RA, the thermal actuator modulates the valve open. If the fluid temperature is above the valve’s set point, the temperature control valve will continue to modulate open allowing additional fluid discharge.
As the outlet temperature falls, the valve then modulates toward the closed position, reducing flow. This modulating action maintains a relatively constant outlet fluid temperature.
Typical Applications
The TV/HAT-RA valve may be used to regulate the flow of cooling water, glycol or other cooling media in applications requiring economical removal of heat from equipment or a process to maintain a constant temperature. Since the TV/HAT-RA valve opens on rising temperatures, it can be used in many thermal relief valve applications such as liquid cooling systems, water-cooled heat exchangers, injection mold cooling, die-cast mold cooling, and water-cooled compressors.
The TV/HAT-RA-LP (reverse-acting heat actuated trap valve with tube fittings and a leak port) is controlled by a thermally operated reverse acting cooling valve actuator and should be installed on the cooling water outlet of the equipment as an after-flow controller. Since it is what we classify as reverse-acting, the valve will open when the fluid temperature rises to the valve’s set point.
At start-up, this valve is in its closed position, except for the “control leakage”, which allows a small amount of flow to sense the changing fluid temperature upstream in the system. As the outlet water temperature increases to within the set operating range of the TV/HAT-RA-LP, the reverse acting cooling valve actuator modulates the valve open to allow a flow of cool water through the system.
If the cooling water temperature is above the valve’s set point, the valve will continue to modulate open allowing additional flow. As the outlet water temperature falls, the valve then modulates back towards the closed position, reducing flow. This modulating action maintains a relatively constant outlet fluid temperature.
Typical Applications
TV/HAT-RA-LP valves are ideal for controlling cooling water for water-cooled compressors, die-casting equipment, welding equipment, electrical equipment, molding equipment, and other systems with engines or heat exchangers.
Self-operating – no external power source required
Unaffected by pressure variations
Improves system efficiency
Wide choice of set points
Operates in any position
Easy installation
Ordering
PART NUMBER
DESCRIPTION
223 - 102X00 - XXX
3/8” TV/HAT-RA-LP 1⁄4 GPM
223 - 112X00 - XXX
3/8” TV/HAT-RA-LP-SW3 1⁄4 GPM
224 - 102X00 - XXX
1/2” TV/HAT-RA-LP 1⁄4 GPM
224 - 112X00 - XXX
1/2” TV/HAT-RA-LP-SW3 1⁄4 GPM
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