Thermostatic Mixing Valves

Thermostatic Mixing Valves is a valve that blends hot water with cold water to ensure constant, safe shower and bath outlet temperatures, preventing scalding. The storage of water at high temperature removes one possible breeding ground for Legionella; the use of a thermostat, rather than a static mixing valve, provides increased safety against scalding, and increased user comfort, because the hot-water temperature remains constant.

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Detailed Description for Thermostatic Mixing Valves

A thermostatic valve is a device that works behind the scenes to help achieve a desired temperature. It can be used for a range of purposes, such as maintaining a consistent temperature in a room or controlling the temperature output of water from a faucet or showerhead. There are several different types of thermostatic valves including mixing valves, shower valves, and radiator valves.

A thermostatic mixing valve is an apparatus that combines hot and cold water in order to produce a consistent temperature output. Mixing valves are often used to help regulate the delivery temperature of stored water, ensuring a safer and more comfortable water supply. A mixing valve helps prevent scalding or freezing water from spewing out when this stored water is released. Mixing valves are also often used to regulate temperatures in showers, sinks, and bathtubs.

A thermostatic shower valve is a type of mixing valve which can be essential when it comes to bathroom plumbing. For example, if a person is using the shower and a toilet is flushed or another faucet is turned on, the water temperature could change dramatically. As a result, the person in the shower could be scalded by hot water or shocked by cold water. The use of a shower valve helps eliminate these kinds of drastic changes in temperature.

Alternatively, some shower systems use pressure balanced valves, also called anti-scald valves. While a pressure balanced valve system is usually less expensive than a thermostatic valve system, a thermostat valve typically provides better temperature regulation. As with a thermostatic valve, a pressure balanced valve helps regulate incoming hot and cold water supplies. It does this by immediately regulating any variations in water pressure, even when outlet pressure decreases. Most home construction codes require builders to install either a thermostatic valve or a pressure balanced valve.

Thermostatic radiator valves are typically used in hot water or steam radiator heating systems to help maintain a steady temperature in a room. They can experience variations in temperature depending on whether other heat sources, such as light streaming in from a window, are present in the room. As a result, they are usually used in buildings that do not require an exact temperature to be maintained.

In general, a thermostatic radiator valve consists of a valve that controls the hot water flow and an actuator that regulates when the valve opens. As a room grows warmer, the valve restricts the flow of hot water. Conversely, when the room cools, the valve allows more heat to be distributed into the room.

There are three main categories for water temperature controlling devices: Heat Source, Group Control, and Point-of-Use.

Heat Source

·         These are used with central heating systems that use water as a medium.

·         Tempering valves for use on hot water heat distribution systems

·         High flow rates suitable for use in under floor (radiant) heating applications

·         Allows water to be stored at a higher temperature

Group Control

·         These provide a uniform distribution temperature for all hot water outlets in a household.

·         Designed for multi-point applications

·         High flow rates

·         Temperature stability


·         These are single Outlet Thermostatic Mixing Valves, often called "thermostatic faucets", "thermostat taps" or "thermostat valves".

·         Designed for single point applications, such as individual showering, hand wash basin mixers, bath or tub fillers

·         High level protection against scalding and thermal shock

·         Although other temperature regulating valves exist, thermostatic mixing valves are the preferred type in health care facilities, as they limit maximum outlet temperature, regardless of pressure or flow.



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