Radiator flow

LVH · Posted: Sat Nov 24, 2007 8:00 pm Post Subject: Radiator flow

Recently brought a house. Radiator valves were leaking, therefore replaced all manual valves with TRVs and Lockshield valves (in same place as manual). Heating now going through the outlet first i.e lockshield. Unfortunately not sure which way flow went prior to change. Is this OK? Is this normal? Any comments welcomed. Confused!!!

Terrywookfit · Posted: Sat Nov 24, 2007 8:04 pm Post Subject:

If you have fitted Bi directional valves it should not matter !!

hi-spec plumbing heating · Posted: Sat Nov 24, 2007 8:08 pm Post Subject:

it's ok providing they are bi directional trvs.
look for arow markings on the chrome part of the trv

LVH · Posted: Sat Nov 24, 2007 8:21 pm Post Subject:

Arrow is pointing upwards. Think they are bi-directional.

hi-spec plumbing heating · Posted: Sat Nov 24, 2007 8:38 pm Post Subject:

one arrow is not bi directional

hi-spec plumbing heating · Posted: Sat Nov 24, 2007 8:40 pm Post Subject:

http://www.plumbworld.co.uk/images/pwmf0001l.jpg

bi directional

bengasman · Posted: Sun Nov 25, 2007 11:48 am Post Subject:

Though it should not matter with bi-directional valves, I have found that some brands are easier to balance when all fitted on the same side. There is definitely no down side to sticking them all on the inlet side, so you might as well swap those that are on the return side.

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D_Hailsham · Posted: Sun Nov 25, 2007 12:02 pm Post Subject:

LVH wrote:

Arrow is pointing upwards. Think they are bi-directional.

The flow must be in the direction of the arrow, otherwise the valve will chatter as it tries to close.

For a guide on balancing TRVs read: Drayton Guide to Balancing Systems with TRVs