How a control valve works

All types of regulating valves can be divided by their principle of action into limiting, mixing or separating the flow of the working medium. Valves that close the flow are called two-way valves, while mixing valves are called three-way or four-way valves, depending on their design.

A two-way regulating valve has two flanges for connection to the pipeline and is designed to limit water flow. Depending on the design of the closure element, the principle of operation of the regulating valve is similar to that of a globe valve or ball valve.

Two-way regulating valves are widely used in engineering systems of buildings with centralized heating (from heating networks). This is due to the fact that with the help of a two-way valve, it is possible to limit the flow of the heat carrier and at the same time provide the required mixing coefficient, which cannot be done with three-way valves.

Two-way regulating valves are used to control the heat transfer of heat exchange units in hot water supply and independent heating systems, to control the mixing process in heating substations with dependent connection to the heating network, and as an actuator for indirect flow, pressure, or pressure drop regulators.

A three-way regulating valve is designed for mixing or separating the flow of the heat carrier, so they are also called mixing or separating valves. Three-way regulating valves have three ports for connection to the pipeline.

They are widely used in heating systems connected to autonomous boiler rooms, where there is no need to limit the flow while maintaining the mixing coefficient. They are installed to control the heat transfer of heat exchange units in hot water supply and heating systems connected independently, to control the mixing process in heating systems with dependent connection in the boiler room.

A four-way regulating valve is designed for mixing the flow of the heat carrier and works on the principle of double passage. They have four ports for connection to the pipeline. This type of regulating valve is used quite rarely and usually in heating systems connected to autonomous boiler rooms.

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