Ensuring a regular maintenance schedule, by a qualified contractor, is the key adequately controlling the temperature of your hot water outlets

Thermostaticmixing valve

Other valves that may be located in the valve train before the tempering valve, cold water expansion valve, non return valve, line strainer, isolation valve.

The temperature in a water storage heater should be stored above 60°C (140°F) to maintain a hot water supply clear of legionella bacteria. Water at this temperature has the potential to scald users easily, especially the young and the old.

Watertemperingvalve

The maintenance schedule should include tests of surrounding valves also, this can loosen lime scale and other debris, so working down the chain of valves in order is the best option.

Inside the tempering valve is a thermostatic element which is sensitive to changes in the water temperature.  As the temperature changes the thermostatic element expands and contracts in concert. This movement controls a piston that selectively restricts the hot water and mixes in the cold water to achieve the predetermined temperature.

Tempering valves are inherently simple in form and function. The valve contains two inlets and one outlet. The inlets are marked with H for hot and C for cold inlet connection. The final is labelled OUT, MIX or is labelled with an ↓ for the outlet.

Tempering valves have a screw adjustment, so you can fine tune your required temperature. The temperature is adjustable in most valves between 30°C and 55°C (86°F - 130°F)

EyewashMixing Valverequirements

We enjoy the partnership we have forged with Mercer and appreciate their level of customer support. Mike Fravert ARCO Engineering Kentucky

CommercialMixing Valve

Over the last ten years, we have not had one single complaint regarding valve failure. Jim Bedford QC Pumps & Compressors, Ltd. New Brunswick

We take pride in supplying, Made in the USA, products that serve as our customers’ last line of defense. But we do not stop there. Our engineers and technicians work tirelessly to explore new ways to improve the safety, reliability, and longevity of our safety relief valves, decreasing the cost of ownership. Mercer Valve is a company you can trust to keep you safe and protected.

ThermostaticMixing valvefor eyewash station

As members of the Mercer Valve family, we are dedicated to safety. With the best interests of our communities in mind, from design to distribution we take exceptional care to ensure the safety and integrity of our people, products, and operations. We believe that in addition to long-lasting pressure relief valves, the most valuable product we provide is peace of mind.

BradleyMixing Valve

Larger commercial and industrial applications can use larger sized valves 65mm (2½”), or include a mixture of the smaller valves to service specific areas when branching from the main lines.

Low flowMixing Valve

Generally, in childcare settings and elder care facilities, water supplied to sanitary fixtures such as basins, baths and showers is tempered (controlled) to less than 40°C (104°F) to ensure no scalding incidents. In these cases, generally a thermostatic mixing valve is used, which is more accurate and rapid to respond to temperature changes, but a tempering valve can be used.

Your hot water is not just there. How it gets to your tap is not smoke and mirrors, it is a carefully regulated and a precisely engineered solution to provide you with a controlled water temperature. A little-known valve that keeps you unscathed is the tempering valve.

A tempering valve mixes the hot water from the cylinder with cold water from the water main in a ratio which can be regulated by turning the temperature adjustment screw. There’s a small amount of variability to account for changes in the source temperature.

All tempering valves are not for all uses. Different specifications and types of valves are required for different systems, such as solar, industrial, circulating systems and domestic systems. Often the colour of the cap on the valve will tell you what systems the valve is designed for.

The tempering valve is accurate to approximately +/-3°C, therefore the hot water from your fixture may vary slightly in relation to the temperature you have set the valve to.

Hot and coldwater mixing valve

A tempering valve should last a minimum of 5 years, some brands purport 15 year service life. Maintenance is important to ensure optimum performance, especially in areas where water requires heavy treatment or the water is high in minerals. 6 to 12 monthly maintenance checks are the norm, depending on manufacturer’s instructions.

Generally tempering valves are of brass construction, connected to water heater and cold supply with copper. Copper and its alloys are used because they are inherently antimicrobial, as an added safety component to the water supply.

Mercer Valve is a mixed-mode manufacturer committed to providing high-quality, long-lasting pressure relief valves that distributors, manufacturers, and families can depend on every day. We take safety seriously and prioritize it in everything we do, from the engineering and production of our valves, to their service and repair. Trust us to deliver powerful solutions that keep you safe.

Tempering valves may not be able to withstand town supply pressure, therefore the valve is located, more than likely, after a pressure limiting/pressure reduction valve.

The placement in the tempering valve changes depending on the brand. Some valve brands are allowed to be directly attached to the outlet of a water storage heater, such as the RMC brand. Other brands need to have a minimum of 1m (approximately 3’) of copper from the storage heater to the hot inlet.

At Mercer Valve, we are committed to providing high-quality, unmatched service and repair, delivered on time for our customers. Our team of skilled technicians delivers reliable solutions for all your needs, offering service and repairs for all valve brands, on-site and mobile services, training, and compliance with DOT and our customers’ OQ requirements.