Two newbie question for the experts, but here goes...
1. Under what circumstances do you use a SINGLE non-return valve, and when
do you use a DOUBLE non-return valve ? What advantages/disadvantages does
one have over the other ?
2. Whats the difference, apart from a few pennies, between an ISOLATING
valve and a SERVICE valve ?
Q1 is for a pumped hot-water loop, and the valve is to ensure water goes the
right way round the system ie preventing the fresh cold water entering the
loop from going the shortest way round the loop and bypassing the
Q2 is just idle curiosity.
Thanks in advance
Thanks for the reply. I'd certainly agree with the comment about
reliability - I've had problems recently with my system's hot water loop not
maintaining temperature properly when drawing off eg for a bath, and this
was worse if the pump was switched off. When the pump was on and not drawing
water, I'd then also get a rattling noise. I finally traced the problem to
the single valve not closing properly.
So I'm changing it for a double !! (or was I just unlucky?)
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