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Reducing Valve
Reducing Valve
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Frequently Asked Questions...
pressure reducing valve?
I have recently moved to a new property I was reading some of the paperwork supplied by the managing agents and I found a notice regarding the hot water cylinders and the fact that some of them had ruptured due to the mains water pressure which can be up to five bar in this area.
It went on to say that the pressure reducing valve should be set at 2.5 bar and in addition the expansion vessel fitted to the coil to accommodate shock loads and high pressure should be checked to ensure that they are pre charged to 2.5 bar…
Now the problem…
I altered the setting on the Caleffi 5334 valve by Turing the screw anticlockwise the gauge initially dropped from 3 bar (factory set) to around the 2.5 after a short while it started to climb and went up to around 3.5 Bar I could tell the pressure had been reduced by the fact the water was running slowly I have been told that this is a mains hot water system so the hot water is a mains pressure …
Thanks for any help
Answer:
The temporary increase in pressure is due to expansion of water as it heats and is normal. Your system is called an "Unvented Domestic Hot Water Storage System".
It is inadvisable and illegal for you to adjust anything on the system yourself, so I wouldn't touch it again. The system needs to be serviced annually, so just leave it to a service engineer, so you don't have any accidents. If you did, your insurance company wouldn't pay for anything, as you are not competent to make any adjustments etc.
























































































