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DOES THE CHECK VALVE ON A CALEFFI AIR VENT REALLY WORK ???
Hi all,
I did some work on my boiler over the summer and installed 2 new Caleffi air vents with the check valve under them. Supposedly, the check valve will allow you to remove an old vent valve and install a new valve without the need to relieve the pressure in the system or drain the system down. I have a couple of spares and was checking them out, but the check valve does not seem to close fully until the vent is completely unscrewed and removed. It appears that the check valve is open for a split second while you are unscrewing the vent, and actually closes as you remove the vent, which would allow liquid to escape and possibly burn you. I have enclosed a few pictures--One with the vent screwed in, and a couple with the vent just about unscrewed all the way and another with the vent removed showing the check valve closed. Have any of you actually tried to replace a vent when there is a check valve installed, and did it work properly ???
The first pic shows the 2 pieces.
The second pic shows the vent about 1/32 of a turn from being removed, and if you look close the check valve is still slightly open.
The third pic shows the vent screwed into the check valve as it would be when installed in the system showing the check valve open.
The last pic shows the check valve in the closed position with the o-ring seated & sealed. The valve doesn't actually reach this position until the vent is totally removed. Even if the vent is 1/8 turn before removal, that o-ring IS NOT seated. It seats as you lift the vent out of the check valve.
Do these check valves really work ???
RON
I did some work on my boiler over the summer and installed 2 new Caleffi air vents with the check valve under them. Supposedly, the check valve will allow you to remove an old vent valve and install a new valve without the need to relieve the pressure in the system or drain the system down. I have a couple of spares and was checking them out, but the check valve does not seem to close fully until the vent is completely unscrewed and removed. It appears that the check valve is open for a split second while you are unscrewing the vent, and actually closes as you remove the vent, which would allow liquid to escape and possibly burn you. I have enclosed a few pictures--One with the vent screwed in, and a couple with the vent just about unscrewed all the way and another with the vent removed showing the check valve closed. Have any of you actually tried to replace a vent when there is a check valve installed, and did it work properly ???
The first pic shows the 2 pieces.
The second pic shows the vent about 1/32 of a turn from being removed, and if you look close the check valve is still slightly open.
The third pic shows the vent screwed into the check valve as it would be when installed in the system showing the check valve open.
The last pic shows the check valve in the closed position with the o-ring seated & sealed. The valve doesn't actually reach this position until the vent is totally removed. Even if the vent is 1/8 turn before removal, that o-ring IS NOT seated. It seats as you lift the vent out of the check valve.
Do these check valves really work ???
RON
0
Comments
-
Yes, they work as long as the o-ring doesn't get fouled.8.33 lbs./gal. x 60 min./hr. x 20°ΔT = 10,000 BTU's/hour
Two btu per sq ft for degree difference for a slab0 -
So the air vent itself, as it is screwed in, depresses the internals to open the check valve? Just like a Schrader on AC fittings? What a country!
1
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