Central Heating Diverter valves

Diverter (or diverting) valves, usually mounted on or near the boiler, are used on pumped-primary circuits. The use of these enables the usual allowance in boiler capacity for hot water, necessary on gravity circuits, to be disregarded.

A diverter valve works by satisfying, in turn, either the heat requirements of domestic hot water or heating. This has advantages where used with low-water content systems and high-recovery cylinders. Usually, the domestic hot-water demand is set to take priority over that of central heating.

Other than on exceptionally cold days, it is seldom necessary to accept slightly cooler central heating-and then only if there has been an exceptional demand on domestic hot water.

This does not necessarily mean a cold home, for the hot water is heated very quickly on pumped primaries, particularly with low-water content systems, used in conjunction with high-recovery cylinders.

The system switches over to provide domestic heating once domestic hot water needs are satisfied.

If hot water is drawn off, or cools, the diverter valve swings back to satisfy the cylinder thermostat’s call for heat, before reverting to the heating position, once this is met.

Some diverter valves have a switch to vary the priority. A newer type, the ‘proportional’ diverter valve, ‘shares’ the call for heat between cylinder and central heating.

Motorized valves can also be used to provide ‘zoned’ heating control. This works by switching in or out a group of radiators or similar appliances. Zone control can also be effected by means of thermostatic radiator valves.

10. November 2011 by admin
Categories: Featured, Handyman Tips | Tags: , , , , , , , , , | Comments Off on Central Heating Diverter valves


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