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Posted on: 2014-04-24 23:58:41
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Valves fitted on Radiators





There are two different types of valves that are fitted to a radiator of a CH system. The first valve is fitted to open up and close down the actual volume of water that can pass through the radiator. The second is called a radiator lock-shield valve and not as easily adjusted as the first because it has a different job to perform. It is also covered by a plastic dome cap. Mayfair Plumbers can fit radiator valves.

The first valve that was mentioned is used to open and close the radiator, and may consist of a simple plastic headed on/off control valve. Alternatively it could be a TRV, better known as a thermostatic radiator valve. The system installer usually chose whether to use a manual valve or thermostatic radiator valve, but now building regulations insist that TRV's must be used. A manual valve can only be fitted of to radiators in rooms where a thermostat has been fitted.

The TRV automatically closes off the water supply to the radiator when the desired temperature in the room is reached, which is good for saving fuel and also ensuring that heat is not supplied wastefully.

The lock-shield valve, which is located at the opposite end of the radiator, has a specific job which is to control the amount of water that flows through the radiator. It is exactly the same as the manual valve. This valve however has been pre-adjusted to a setting with a spanner at the time of installation during system balancing. Soho Plumbers can balance a heating system.


Balancing:

In order to make sure that the first radiator on the heating circuit does not take all the hot water flow from the boiler, as it is the shortest route, the lockshield valve is partially closed. Having this valve open by only half a turn, the water is forced to continue along the heating circuit to the next radiator. So the radiator lockshield valves are also adjusted as required to force the floor water throughout the whole system.


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