Maintaining control of a tempered system’s outlet water temperature can be difficult. Outlet temperature is affected by the temperature of the water provided to the system, which can fluctuate depending on its source and the location’s climate. Installing a TMV, rather than a static valve, improves the safety and comfort of the user.

ThermostaticMixing Valve15mm

Tempered water systems use TMVs to protect against scalding in municipal water systems, emergency showers, eye wash stations, and care facilities like hospitals and nursing homes. Most facilities require tempered water systems that meet ANSI international safety standards. ANSI Z358.1 states that the temperature of water delivered by tempered systems should be 60-100°F (15-38°C). Temperatures over 60°F (15°C) allow for continuous flushing without causing hypothermia or shock. The upper limit of 100°F (38°C) protects against scalding and bacteria growth, a concern when water is stored at high temperatures.

For example, in a non-condensing boiler system, if the water returned to the boiler drops below 140oF (60°C), condensation of the flue gas occurs. This, in turn, causes corrosion on the copper fins of the boiler. Conversely, if the temperature of the returned water is too hot, it can lead to thermal shock, a condition where a sudden change in temperature causes rapid and uneven expansion and contraction of the boiler’s structure. Typical boiler systems that benefit from a TMV include in-floor radiant heating, hydronic heating, heat pumps, soil heating and various manufacturing operations.

ThermostaticMixing ValveBath

Both snow melt and ice melt systems are designed to turn on automatically when they are needed. For driveways, roads, and pathways, a moisture- and- temperature-sensing “puck” turns on the system when it detects moisture and temperatures close to freezing. Electric roof heating systems are triggered by a temperature-sensing puck or wire.

At LaBella Associates, we’ve built partnerships with our clients since our inception in 1978.  If there’s been a need, we’ve responded.  The result? Diverse service offerings that can address any aspect of the built or natural environment.

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ThermostaticMixing Valvetap

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Ice damming can also occur when sunny days melt snow on dark roof surfaces. Snow melts fastest at peaks where the highest concentrations of heat are located. Water drips down to the roof’s edge, where it meets frigid air temperatures and a cold roof due to an unheated space below and freezes into an ice dam. As snow continues to melt, it backs up behind the ice dam and dangerous icicles form along the roof edge. These dams are exacerbated when outdoor air temperatures fluctuate – warmer winter days cause increased ice and snow melting.

With so many sizes, body materials, and flange options, AMOT is sure to have the right valve for your application. It’s easy to select the options and request a quote right from our website. Give the filters a try on our thermostatic control valve page or contact us if you need assistance.

Thermostaticmixing valvehow it works

AMOT has been in the business of developing the best temperature control technologies since 1948. Our earlier blog, “What is a Temperature Control Valve,” explained how these devices work, the different types of valves available, and how the valves are used in different applications. In this article, we’re going to dive a bit deeper into a specific type of temperature control valve: thermostatic mixing valves (TMVs).

ThermostaticMixing Valve28mm

Electric ice melt systems for roofs eliminate ice damming at the eaves of buildings. When rooms in a building are heated, that warm air raises to the attic and can melt lower layers of snow on the roof. The melted snow runs to the edge of the roof, where it freezes. As more and more snow melts and then turns to ice, the ice dam makes its way up the roof and seeps underneath the shingles. This process results in dangerous water damage and the potential for mold growth.

Thermostaticmixing valveoutside tap

There are two types of heating systems that melt snow and ice – electric and hydronic. Electric systems draw from the building’s power and use that energy to heat coils. These are typically best suited for melting dangerous ice that forms on roofs. Electric snow melt systems aren’t typically recommended for pathways and roads because they raise utility bills and can be affected by power outages. Hydronic systems, on the other hand, use hot water or steam from a boiler and are a more economic option for heating ground surfaces.

An ice melt system consisting of de-icing cables that run along the roof and through gutters and downspouts can prevent the occurrence of the ice damming. The electric cabling, being constant wattage, should not be overlaid and should be carefully installed to avoid overheating and possible short circuiting. LaBella Associates can work to design an effective ice melt system and can oversee construction to ensure proper installation.

LaBella has designed multiple hot water snow melt system installations for sidewalks, roads, and truck ramps. Snow melt systems reduce the risk of injuries from slipping, eliminate the physical labor (and cost) of shoveling and plowing, minimize accidents caused by icy roads, and improve the aesthetic appeal of pathways and driveways.

A temperature control valve that is actuated by internally sensing and controlling fluid temperatures is called a thermostatic valve. This type of valve is self-contained without any external power source.  AMOT pioneered this technology in 1948 when we introduced into our valve design a special wax that remains in a semi-solid form and is highly sensitive to temperature changes. As the temperature of the fluid changes, it causes the wax to expand or contract which slides the valve up or down, opening or closing ports.

AMOT has been a trusted manufacturer of 3 Way TMVs since 1948 and pioneered the wax element technology used today. These rugged, reliable valves provide a “Fit and Forget” solution where a mixing configuration is needed. Our factory pre-set elements are accurate, and our service kits contain all the components necessary to make easy work out of valve maintenance. Simple to install, operate and maintain, AMOT TMVs provide years of trouble-free, reliable temperature control without the need for external power sources.

ThermostaticMixing Valve22mm

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Thermostatic mixing valves often are used in industrial, residential, or commercial applications that need to ensure a constant outlet temperature to prevent damage or injury.

Thermostaticmixing valve temperaturesetting

LaBella has partnered with many municipalities to design these systems with efficiency, effectiveness, and safety in mind. If you have a problem area and would like to explore the feasibility of constructing one of these systems, contact us today.