12-09-2008, 07:20 PM
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Deity
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Join Date: Jul 2004
Location: Saint Regis Falls, NY, USA.
Posts: 4,978
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Thanked 102 Times in 102 Posts
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Part A is an air bleed off valve. When steam hits it it should shut off. Part B is your shut off for the steam. Any steam that condenses in the line or radiator runs back to the boiler along the same pipe. sometimes you may hear a clanging in the line - this is the steam hitting the water condensate and flash boiling it.
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