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Bronze thermostatic mixing valve, compact rectangular body, threaded inlet and outlet ports

Leonard Valve

Leonard Valve 370-LF thermostatic mixing valve bronze 0.5 to 13 gpm

SKU CH-40S5-1GZB2

Thermostatic mixing valve in bronze blends hot and cold water from 0.5 to 13 gpm at 90 to 140 °F, meets ASSE 1017 and 1070 standards, and withstands 125 psi

  • TypeOther
  • Precise temperature control from 90 to 140°F protects users from scalding
  • Flow range of 0.5 to 13 gpm suits low-demand and high-demand fixtures
  • Bronze body with integral check valves resists corrosion and prevents cross-flow
  • Certified to ASSE 1017, ASSE 1070 and CSA B125.70 for code compliance
  • Polymer shuttle and stainless-steel springs deliver reliable thermostatic response over time

Thermostatic Mixing Valve 370-LF

The Leonard Valve 370-LF is a bronze thermostatic mixing valve designed for plumbing systems that require precise temperature control. It serves installers and facility managers who need a reliable way to blend hot and cold water to a safe, consistent outlet temperature for domestic or light commercial fixtures.

Sustained Load Behaviour

The valve maintains its set point across a flow range of .5 to 13 gpm, using a polymer thermoplastic shuttle and stainless steel springs that respond continuously to inlet fluctuations. Integral check valves prevent cross-flow during prolonged operation, while the Buna-N O-ring and bronze body resist wear under continuous pressure up to 125 psi.

Interface Practical Limits

Connections are 3/4 in MNPT inlets and outlets, limiting installation to piping that matches this thread size and type. The valve is certified to ASSE 1017, ASSE 1070, ASSE 1070-2015 and CSA B 125.70 -15, so it cannot be used where other standards are mandated. Hot inlet temperature must stay between 120 and 200 degrees F, and the adjustable outlet range stops at 140 degrees F.

Highlights

  • Precise temperature control from 90 to 140°F protects users from scalding
  • Flow range of 0.5 to 13 gpm suits low-demand and high-demand fixtures
  • Bronze body with integral check valves resists corrosion and prevents cross-flow
  • Certified to ASSE 1017, ASSE 1070 and CSA B125.70 for code compliance
  • Polymer shuttle and stainless-steel springs deliver reliable thermostatic response over time

Specifications

BrandLEONARD VALVE
TypeOther

Questions about this item

How much heat does the 370-LF valve add to a mechanical room when it runs all day?

The valve itself generates no heat; it only blends hot water at 120 to 200 °F down to a 90 to 140 °F outlet using a polymer thermoplastic shuttle and stainless steel springs, so room temperature is unaffected.

What piping must already be in place for the 3/4 in MNPT inlets and outlets to connect?

You need 3/4 inch male NPT threaded connections on both hot and cold supply lines and on the mixed-water outlet, rated for at least 125 psi and the 0.5 to 13 gpm flow range.

Will the integral check valves on the 370-LF interfere with an older gravity-fed hot-water loop?

The integral check valves prevent cross-flow between hot and cold inlets, which is compatible with gravity-fed systems as long as supply pressure does not exceed 125 psi and inlet temperatures stay within 120 to 200 °F.

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