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 Post subject: What is this bit please?
PostPosted: Fri May 25, 2018 8:08 am 
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I was decorating in a customer's house and in the boiler cupboard there was this weird thing attached to the pipework above the boiler. I've never seen one of these before so I am curious as to what it is.


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PostPosted: Fri May 25, 2018 8:54 am 
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I think it is an anti gravity valve. it stops hot water creep from the tank into the rads during the summer months when the heating is off. The pump lifts a weight in there when the heating is on to allow circulation. They can jam up causing a loss of heat which happened to me back in the 70's

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PostPosted: Fri May 25, 2018 9:12 am 
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It's an air separator.

It helps get rid of the air in the system as the water passes through it from the boiler.

It should be at the highest point in the system to help it work best.

It has flow from the boiler, flow to the pump and the top one should be to the vent over the header tank.

Can be prone to sludge up therefore hindering circulation.

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PostPosted: Fri May 25, 2018 9:15 am 
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Not a gravity valve then Dave, I must admit mine was in a straight run near the boiler.

Nice try by me though, no cigar :lol:

:thumbright:

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PostPosted: Fri May 25, 2018 10:58 am 
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Is it something that was installed in the olden days? :lol:


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PostPosted: Fri May 25, 2018 5:24 pm 
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They used to be installed to eliminate air problems and produce balanced pressure for the feed and vent to stop pumping over.

More recently they were made by Myson and called the Myson Aerjec.

I believe they are no longer made since around a year or so ago.

Didn't do much more than a standard 'H' pattern fill and vent pipe set up IMO.

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PostPosted: Fri May 25, 2018 11:25 pm 
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The customer's late husband was an engineer and everything in the house was over-engineered including the decorating! It was all done to a very high standard.


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