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Vacuum Breaker for One Pipe Steam
Can anyone provided up to date recommendations for a vacuum breaker on a one-pipe steam system? I had been using a bronze check valve, but it doesn't always close tightly, causing steam to escape. It also tended to drip hot condensate quite often. I've now plugged it for the time being to avoid dripping onto dear family members.
I have several Gorton 2s and a B&J Big Mouth on this particular main, and none of them seem to open quickly enough to prevent steam being sucked back out of the radiators when the boiler shuts off, sucking in air through the rad vents. See the attached images... the graph lines named "Rad" are the radiator temperatures. Note that in the Non-Vacuum-Breaker image, the temperature curve drops sharply upon boiler shutoff... versus WITH a Vacuum Breaker, where the temperature curve has a more gradual decline... keeping more heat in the rad for longer.
I've seen mention of this device (below) in other discussions here on the wall... I'd be interested in any experiences with it, or suggestions of other solutions:http://www.amazon.com/Barnes-Jones-MPT-Vacuum-Breaker/dp/B0191X6YK6