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Default High pressure vs. low pressure ball valves.

Hi,
The ball valve in our cold water header tank seems to be causing some
knocking and
generally seems to be due for a change (intermittent overflow for
example). In my local
B&Q there are two varieties of valve: high and low pressure. My
Collin's DIY manual gives
no guidance on this subject so I'm wondering if there is some decisive
factor in which to use.
The house is a normal two storey semi with a good mains pressure.
Thanks in advance for any advice,
Peter.