Motorised Valves

Electrically operated valves to permit, prevent or direct the water flow within a system.

Both 2 and 3 port valves are commonly used and the choice depends on the application, pipework layout and preference.
 
3 port valves are suitable for providing separate heating and hot water circuits. There are two types of 3 port valves, one type only diverts the full flow of water whilst the other provides a mid position so that shared flow to both hot water and heating is possible.
 
For more than one heating zone, in addition to a hot water zone, use a separate 2 port valve for each additional zone.
 
22mm valves are usually suitable for boilers up to around 20kW. For larger boilers, and when fitting a motorized valve on a gravity hot water circuit, 28 mm or larger should be used.
 
Auxiliary switches on valves should be wired to switch the boiler/pump off when there is no demand for heat or hot water.