Air in pumped system

[scottb]

I wonder if anyone could shed some light!!

I have a 15 year old pumped water system which has been getting air in it for sometime.

My manual air release valve is directly after the water pump (on the flow)and I have to open this on a daily basis to expel all the air.

Every now and again, the boiler's pilot light will blowout after if makes a quick noise - I'm assuming this is the air in the system...?

I have flushed the system and this was clean. The OSVP is okay and is not sucking back.

The FE tank is small and the water line is about 2 inches above the boiler feed pipe (there is 6" allowable expansion). The water line seems to be changing all the time (this may be just my eyes?!)

What I would like to know is:

Would an automatic air vent solve the problem of air having to be manually released on a daily basis?

Is air getting in the boiler feed pipe - do I need to changed my FE tank for a bigger one or fit a new ball cock to allow for a higher level of water.

Could it be the pump unions?

Just to let you know, there are no leak's anywhere

nay help on where this air could be getting in would be most welcome.

Thanks in advance

 

[Kingsway]

air in heating systems is simply down to bad design
is the pump on the return pipework?
This always creates air problems. if so you need to get that changed