Auto Fill Valve

Auto Fill Valve

PostBy: Qtown1835 On: Tue Mar 21, 2017 9:35 am

Just thought of something the other day. For those that have an auto fill valve, lets say fill pressure is set to 12psi. shouldnt the auto fill maintain a min psi through the boiler system at 12psi? The expansion tank would just act as a buffer then as the water is heated. Am I on the right track with this line of thinking ?
Qtown1835
 
Stoker Coal Boiler: Keystoker '81 KA4 (online 1/16/17)
Hand Fed Coal Stove: Harman MKIII
Coal Size/Type: Nut & Rice Lehigh
Other Heating: EFM SPK600


Re: Auto Fill Valve

PostBy: coaledsweat On: Tue Mar 21, 2017 2:43 pm

That is correct. It may go a little higher as the water gets hotter but should maintain about 12# at minimum.
coaledsweat
 
Stoker Coal Boiler: Axeman Anderson 260M
Coal Size/Type: Pea

Re: Auto Fill Valve

PostBy: Qtown1835 On: Tue Mar 21, 2017 4:06 pm

coaledsweat wrote:That is correct. It may go a little higher as the water gets hotter but should maintain about 12# at minimum.


With that said, if boiler pressure would fall below 12psi, it would be safe to assume that the auto fill could be potentially malfunctioning.
Qtown1835
 
Stoker Coal Boiler: Keystoker '81 KA4 (online 1/16/17)
Hand Fed Coal Stove: Harman MKIII
Coal Size/Type: Nut & Rice Lehigh
Other Heating: EFM SPK600

Re: Auto Fill Valve

PostBy: coaledsweat On: Tue Mar 21, 2017 4:09 pm

They may waver a few pounds. If it falls below 10# it may need adjusting or replacing. Keep in mind, well water can do a number on them. I've had 3 in 20 years.
coaledsweat
 
Stoker Coal Boiler: Axeman Anderson 260M
Coal Size/Type: Pea

Re: Auto Fill Valve

PostBy: Olllotj On: Tue Mar 21, 2017 5:59 pm

Remember most are adjustable.
Olllotj
 
Stoker Coal Boiler: Keystoker KB-8
Coal Size/Type: Buckwheat
Other Heating: Utica Propane Hot Water Baseboard