samboy Posted October 15, 2018 Report Share Posted October 15, 2018 Hi gang. Was thinking of buying some of these are they any good ?. Thanks all. Quote Link to comment Share on other sites More sharing options...
Yellow Bear Posted October 15, 2018 Report Share Posted October 15, 2018 In a word - No Quote Link to comment Share on other sites More sharing options...
TIGHTCHOKE Posted October 15, 2018 Report Share Posted October 15, 2018 If you have to repeatedly bleed your central heating system you have a problem. Automatic self bleeding radiator valves my ****! Quote Link to comment Share on other sites More sharing options...
simonm Posted October 15, 2018 Report Share Posted October 15, 2018 No they'll probably leak lol and as stated you shouldn't need one (although there is normally an automatic bleed valve at the highest point of the system often next to hot water cylinder). Quote Link to comment Share on other sites More sharing options...
Stonepark Posted October 15, 2018 Report Share Posted October 15, 2018 I had them in previous house as had two radiators (not in sequence) that caught all the air and fitted auto valves, saved a whole lot of hassle and did not leak. No need to use them on every radiator but if you have one downstairs and one upstairs on the biggest culprits, it is useful as then only have to bleed others maybe every 3 or 6 months. Quote Link to comment Share on other sites More sharing options...
Old Boggy Posted October 15, 2018 Report Share Posted October 15, 2018 4 hours ago, TIGHTCHOKE said: If you have to repeatedly bleed your central heating system you have a problem. Automatic self bleeding radiator valves my ****! As Tightchoke rightly said if the system requires regular bleeding then there is a problem. One such problem could be hydrogen evolution where the pipe work metal, either copper or iron is oxidised leaving pure hydrogen in the system as the following happens with copper pipe work i.e. H2O+Cu = CuO + H2 This can be demonstrated when a rad is bled off and the hydrogen ignited at the rad's air vent where it burns with a bright blue flame. Looks quite dramatic but not really dangerous. The solution is the introduction of an inhibitor. The old method was to squirt some fairy liquid into the F&E tank where it was a system boiler, but these days an inhibitor can be injected via the rad's air vent. OB Quote Link to comment Share on other sites More sharing options...
Yellow Bear Posted October 16, 2018 Report Share Posted October 16, 2018 A further problem is with earlier plastic systems where the pipe was oxygen permeable. Quote Link to comment Share on other sites More sharing options...
figgy Posted October 16, 2018 Report Share Posted October 16, 2018 Better to fit proper automatic air vents to the pipes. Quote Link to comment Share on other sites More sharing options...
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