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

SKU: 325-000000-XXX Brass     325-100000-XXX SS (½") 326-000000-XXX Brass     326-100000-XXX SS (¾") 327-000000-XXX Brass     327-100000-XXX SS (1")

Product Description

DTV, available in ½”, ¾”, and 1″ NPT water connection

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


  • 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

Design Features

  • Rugged, clog resistant valve design
  • Install using standard pipe fittings and tools
  • Operates in any orientation
  • Modulates to conserve cooling water
  • Effluent tempering capacity limited only by cold water flow rate through DTV


The DTV can be used in applications where a high temperature discharge flow to a drain or sewer must be tempered with cold water. The DTV is installed into the drain line such that the hot effluent passes over the thermal actuator of the DTV and this thermal actuator controls the cold-water inlet port. If the hot effluent is above the specified set point, 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 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.

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.