What is it, and what does it do?

[TonyN]

Part of the central heating system in our bungalow is a vertical pipe, not quite at the highest point of the system (it is below the header tank) with a brass/bronze 'gismo', 'thingy' or whatever at the top. This device is about 4" high by 1.5" diameter with a Schrader (car tyre) type valve at the top of it.

What is it's function, and how can I check if it performing correctly? With a Schrader valve at the top I would expect it to allow air (or liquid) in rather than out.

Any experts out there please help.

T.I.A.

Tony Norton

 

[taydo]

it sounds like an auto bleed valve they are put into the system at high points to prevent air locks. just make sure the little screw cap is open about a quarter of a turn and the thing isnt leaking.


Brian