A four-way mixing valve is used for mixing hot and cold water to achieve the ideal fluid temperature in the distribution systems. They allow for a two-inlet and two-outlet mode, or three inlets and one outlet. Four-way valves have a dual mixing function: they mix hot water from the boiler with returning water from the radiator circuit, resulting in water of a higher temperature flowing into the boiler, thus protecting the boiler from low-temperature corrosion. Four-way valves are made from brass with protection against zinc leaching, or cast iron, and are used in heating and cooling systems, water distribution, heating applications, and mixing systems. They can be controlled in three ways: manually with a dial, with a thermostatic cartridge, or with an actuator, for which the correct adapter is required for installation.
All main components of mixing valves can be easily replaced, however, we recommend installing a suitable filter in the system before the valve. This will prevent the need for more frequent maintenance of the four-way valve, extend the lifespan of the valve, boiler, and distribution systems, and prevent excessive wear or potential damage due to a higher amount of mechanical impurities in the water.