Price: Contact us for purchase info: (877) 379-8258

SKU: 325-000000-XXX (½") 326-000000-XXX (¾") 327-000000-XXX (1")

Product Description

DTV, available in ¾”, ½”, and 1″ NPT port

Drain Tempering Valve (DTV) product sheet
Drain Tempering Valve (DTV) Installation and Maintenance Instructions
Drain Tempering Valve (DTV) Sell Sheet


The DTV can be used in applications where a discharge flow to a drain or sewer must be tempered with cold water to reduce temperature. The hot effluent to be tempered is connected to the drain/sewer line using a suitably sized tee fitting and piping sized to handle the effluent flow rates. The hot effluent passes over the thermal actuator of the DTV and this actuator controls the cold-water inlet port. If the hot effluent is above the specified set point, the DTV opens the cold-water inlet port to allow injection of cold water. As the hot effluent cools, the DTV automatically modulates to reduce the cold-water inlet flow. At about 10°F below the full open temperature, the cold-water inlet is fully closed to conserve water.

The DTV provides a convenient, economical, and easy to use method of tempering hot effluent flows. Since the DTV is open only when the effluent exceeds the specified set point temperature, it also conserves water by automatically turning off cold water when not needed.


  • Assures compliance with drain temperature limitations of plumbing code
  • Designed to prevent damage to PVC piping due to over-temperature conditions.
  • Minimizes waste water
  • Easy to install

Design Features

  • Rugged, clog resistant valve design
  • Easily installed using standard pipe fittings and tools
  • Operates in any orientation
  • Minimizes waste water
  • Modulates over operating temperature range to conserve cooling water
  • Effluent tempering capacity limited only by cold water flow rate through DTV

Sample Calculation:

How much effluent can be tempered with a 1” DTV valve?
1) Flow capacity through cold water port of 1” DTV with Cv = 4.0:
CW gpm = Cv x sqrt pressure drop
Assume 50 psig cold water pressure, drain pressure = 0psig
CW gpm = 4 x sqrt (50) = 28.3 gpm
Assume for this example:
cold water temp = 60°F (CT)
hot effluent temp = 212°F (HT)
max. allowable drain temp = 140°F (MT)
2) Maximum effluent flow (gpm) that can be tempered:
CW x (MT-CT)/(HT-MT)
Maximum effluent flow rate = 28.3x 80/72 =31.4gpm

Watch the video below to see how Insinger Machines uses our DTV in their commercial dishwashers.