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Brass thermostatic mixing valve with solder connections, compact rectangular body

Watts

Watts 3/4 LF MMV-US Mixing Valve Brass .5-20 gpm

SKU CH-9YYM-1XWBZ MPN 3/4

A thermostatic mixing valve with brass body and solder connections blends hot and cold water from 80 to 120 degrees F at 0.5 to 20 gpm

  • TypeDrain Components
  • Precise temperature control from 80 to 120°F via solid wax thermostat
  • Handles flow rates from .5 to 20 gpm for versatile installations
  • Brass body withstands up to 150 psi for durable performance
  • Integral filter washers and check valves protect against debris and backflow
  • Accepts hot inlet up to 180°F and cold inlet from 39 to 85°F

Thermostatic Mixing Valve

The Watts 3/4 LF MMV-US is a thermostatic mixing valve with a brass body and solder connections on both inlet and outlet sized at 3/4 in. It regulates blended water output between 80 and 120 degrees F while accepting cold supply from 39 to 85 degrees F and hot supply from 120 to 180 degrees F. Integral check valves and filter washers protect the internal mechanism from debris and cross-flow.

Ideal for point-of-use or small-system tempering

Installers who need a compact valve that handles 0.5 to 20 gpm and fits within a 5 7/16 in height by 4 7/8 in width envelope will find this unit suitable. Systems that demand higher flow capacity, threaded or flanged connections, or a wider outlet temperature range should look at alternative valve designs.

Flow range 0.5 to 20 gpm

This single specification defines whether the valve can serve the intended fixture load; verify the design flow rate against the .5 to 20 gpm window before selecting the part.

Highlights

  • Precise temperature control from 80 to 120°F via solid wax thermostat
  • Handles flow rates from .5 to 20 gpm for versatile installations
  • Brass body withstands up to 150 psi for durable performance
  • Integral filter washers and check valves protect against debris and backflow
  • Accepts hot inlet up to 180°F and cold inlet from 39 to 85°F

Specifications

TypeDrain Components
BrandWatts
Model3/4 LF MMV-US

Questions about this item

What is the flow-rate range of the 3/4 LF MMV-US mixing valve and what pressure limit applies?

The valve handles .5 to 20 gpm and is rated for a maximum working pressure of 150 psi.

What pipe size and connection type does the 3/4 LF MMV-US require for installation?

Both inlet and outlet are 3/4 in solder connections, so you need 3/4 in copper tube and solder fittings.

How is the 3/4 LF MMV-US installed and which step is most often missed?

Solder the valve into the hot and cold lines, then set the outlet temperature between 80 and 120 °F; the step most often missed is flushing the lines before soldering so debris does not clog the integral filter washers.

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