Drain Tempering Valve (DTV)

DTV 300x175 - DTVDrain water from commercial equipment exceeding 140°F can be costly – leading to failed inspections, fines, business interruptions, or injury and damage to personnel and equipment.

ThermOmegaTech’s® Drain Tempering Valve (DTV) tempers excessively hot drain water to comply with international plumbing code temperature regulations. Thermostatic and completely self-operating, the DTV is plug-and-play, giving you one less thing to worry about.

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How It Works:

The DTV tempering valve is installed into the drain line such that the hot effluent passes over the thermal actuator of the DTV which controls the cold water inlet port. If the hot effluent is above the specified set-point of the valve, the DTV opens to allow injection of cold water. As the hot effluent cools, the DTV automatically modulates to reduce the cold-water inlet flow. At 10°F below the full open temperature, the cold-water inlet is fully closed to conserve water.

Since the DTV is open only when the effluent exceeds the specified set-point temperature, it conserves water by automatically turning off cold water when not needed. Available in ½”, ¾”, and 1” sizes in brass or stainless steel, the DTV provides a convenient, economical, and easy to use method of tempering hot effluent flows.

To help you choose the right size valve for your application you will need to calculate the flow rate. Check out the DTV FLOW CALCULATOR for assistance.

DTV Rendering Combined - DTV

Valve Components:

DTV line drawings with callouts 2 - DTV
1 Valve Body Brass or 300 stainless steel
2 Thermal Actuator 303 stainless steel
3 Operating Spring 303 stainless steel
4 Ram-Type Plug 303 stainless steel
5 Seat Seal PTFE
6 Piston 300 stainless steel

Typical Applications:

The DTV is used in applications where a high-temperature discharge flow from commercial equipment must be tempered with cold water before entering a public drain or sewer system. Applications include humidifier discharge to sewer or drain, commercial dishwashers or ware washers, boiler blowdown drain lines, and autoclave discharge.


  • Compliant with drain temperature limitations of plumbing codes
  • Prevents damage to PVC piping due to over-temperature conditions
  • Completely mechanical, self-operating drain tempering
  • Minimizes water waste
  • Easy to install
  • Adaptable to almost any drain size


  • Sizes include 1/2″, 3/4″, & 1″
  • Available in stainless steel or brass
  • Rugged, clog resistant valve design
  • Install using standard pipe fittings and tools
  • Operates in any orientation
  • Modulates to conserve cooling water

IUSMQ - DTV By eliminating the conventional method of using fixed flow balancing valves and installing CircuitSolver®s instead we were able to resolve our lack of hot water in some sectors of the hospital issue instantly.

— André Renaud - Mental Health University Institute of Quebec
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