A mixing valve is a device that combines two or more fluid streams at different temperatures to produce a mixed stream at a desired temperature. Mixing valves are commonly used in plumbing systems to regulate water temperature for showers, baths, and other applications.
Mixing valves typically have separate inputs for hot and cold water and a control mechanism that allows the user to adjust the temperature of the mixed water output. In addition, these valves may use mechanical or electronic controls to maintain a constant temperature and include safety features to prevent scalding or overheating.
Mixing valves are often used in commercial and industrial settings where precise control of water temperature is required, such as in hospitals, schools, and manufacturing facilities. They can also be used in residential settings to improve energy efficiency and reduce water waste by delivering water at a consistent temperature.
What Makes a Thermostatic Mixing Valve Different?
A thermostatic mixing valve (TMV) is a type of mixing valve designed to control and maintain a constant water temperature accurately, typically in applications where hot water is mixed with cold water to provide a comfortable temperature for showers, baths, and other uses.
The main difference between a TMV and a standard mixing valve is that a TMV has a temperature-sensing element that detects the temperature of the water flowing through it. This sensing element allows the TMV to automatically adjust the flow of hot and cold water to maintain a constant temperature, even if there are fluctuations in the incoming water temperatures or changes in the water pressure.
In contrast, a standard mixing valve has no temperature-sensing element and relies on manual adjustments to control the water temperature. This means that the temperature of the water coming out of the valve may be affected by changes in the water pressure or incoming water temperatures, which can result in fluctuations in the water temperature.
The main advantage of a TMV over a standard mixing valve is that it provides more consistent and precise water temperature control, which is essential in many applications where the water temperature can affect comfort, safety, or hygiene.
How does a thermostatic mixing valve work?
A TMV typically has separate inputs for hot and cold water and a mixing chamber where the two streams are combined. Inside the mixing chamber, a thermostatic element expands or contracts in response to changes in temperature. This element is connected to a valve that controls the flow of hot and cold water to produce a mixed stream at a desired temperature.
When the hot and cold water inputs are initially turned on, the temperature of the mixed water output will be determined by the relative flow rates of the two streams. As the water flows through the mixing chamber, the thermostatic element will sense the temperature of the mixed water and adjust the valve accordingly to maintain a constant output temperature.
If the temperature of the hot water input increases or decreases, the thermostatic element will respond by adjusting the valve to reduce or increase the flow of hot water, respectively. Similarly, if the temperature of the cold water input increases or decreases, the thermostatic element will adjust the valve to increase or reduce the cold water flow, respectively.
In this way, the TMV can maintain a constant output temperature even if there are fluctuations in the supply temperature or flow rate of the hot and cold water inputs. This helps to prevent scalding or discomfort due to sudden changes in water temperature.
How do you adjust a thermostatic mixing valve?
The method for adjusting a thermostatic mixing valve (TMV) can vary depending on the specific model and manufacturer but generally involves the following steps:
- Identify the location of the TMV – The TMV is typically installed near the shower or bath and may be located inside the wall or behind an access panel.
- Turn off the water supply – Before making any adjustments to the TMV, it is important to turn off the water supply to prevent accidental scalding or damage to the valve.
- Remove the handle or cover – Depending on the model of the TMV, the handle or cover may need to be removed to access the adjustment mechanism. This can usually be done by unscrewing the handle or using a screwdriver to remove the cover.
- Adjust the temperature – Once the adjustment mechanism is exposed, the temperature can usually be adjusted by turning a knob or screw. Some TMVs may have a digital display that adjusts the temperature using buttons.
- Test the temperature – After making any adjustments, it is important to turn the water supply back on and test the temperature of the mixed water output. The temperature should be checked at the beginning and end of a shower or bath to ensure that the TMV maintains a consistent temperature throughout.
Adjusting a TMV should be done carefully and in small increments to avoid sudden changes in water temperature.
Mixing Valve Examples by Manufacturer
Webstone Mixing Valves
Webstone offers a wide array of mixing valves and accessories for various applications and system requirements. Webstone Thermostatic Mixing Valves (TMVs) can be used in most water distribution systems to ensure fluid is delivered at the appropriate temperature. With seven end connections and optional G1 union temperature gauge and isolation valves, TMVs can be customized for any installation. TMVs are available in four temperature ranges with seven end connection options.
Webstone TMV Features
Integral checks – Removable check valves integrated in inlet fittings minimize space requirements.
Locking handles – Lock temperature setting on select models.
A wide range of accessories – G-Union accessories and kits offer a solution for most installation needs.
Webstone Thermostatic Mixing Valves Product Video
Taco Mixing Valves
Taco offers several series of mixing valves for various applications. Taco mixing valves provide precise and cost-effective temperature control for heating systems.
