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reducing valves

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leaky

May 21, 2011, 05:02:46 PM
When eliminating a header tank on an open vented low pressure system with a hwc at ground level,If you don't have good access to the hwc,is it ok to install a pressure reducing valve in the roof cavity above cylinder? will it still work effectively? or does it have to be installed at a low level to work best?
anyone?

Linkback: https://forum.plumbers.nz/ask-plumbers-trade/43/reducing-valves/651/
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Plumber

#1
May 21, 2011, 05:05:44 PM
Hi Leaky

What are you intending on doing,  HWC open vented or will it have a relief (vacuum relief) valve e.g 7.5?
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Please note that the advice I am giving is only my opinion and not necessarily a fact.  Please refer to our terms and conditions.

TS

#2
May 21, 2011, 06:49:02 PM
It'll be fine leaky. Done it a few times myself without any issues.
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leaky

#3
May 22, 2011, 07:56:51 AM
thanks.
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leaky

#4
May 22, 2011, 08:05:20 AM
TS- The installation is still open vented.the pressure seems to be really crap though as i have installed the brand new reducing valve        just above cylinder,but wondering if i installed it at base of cylinder,would it get more flow because at the moment the flow is crap.
vent pipe would be a good 3.5 metres.
i mean it works but can it be better?
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roberto

#5
September 10, 2011, 09:29:50 AM
if you install the reducing valve in the ceiling/above the roof line - thats ok, just a pain when it comes to replacing the washer or servicing it, the only way to get better pressure would be to install a pressue relief valve on the vent, just make sure you dont have a wetback!!!!, if u ensure both valves are well insulated with wool lagging or similiar, and make sure they are the same or a lower rating than stated on the hwc and you should be fine
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