STEAM ZONE VALES (CONDENSATE)

Norm Harvey

You could also drip each side of the valve if Im not mistaken, but that may or may not be feasible for your application.

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PAUL_68

STEAM ZONE VALVES AND CONDENSATE

I AM HAVING APROBLEM WITH CONDENSATION CREATING A VACUUM UP IN THE SYSTEM.AS ARESULT IT STAYS UP IN THE SYSTEM TOO LONG CALLING THE LOW WATER CUT-OFF TO CALL THE AUTO FEEDER TO ADD NEW WATER. WHEN THE CONDESATE RELEASES IT OVERFILLS THE SYSTEM. ITS SEEMS LIKE A VENTING SITUATION. I SAY THIS BECAUSE IT SEEMS (THE CONDENSATION) TO BE RELEASED ALL AT ONCE.

PAUL_68

STEAM ZONE VALVES AND CONDENSATE

I AM HAVING APROBLEM WITH CONDENSATION CREATING A VACUUM UP IN THE SYSTEM.AS A RESULT IT STAYS UP IN THE SYSTEM TOO LONG, CALLING THE LOW WATER CUT-OFF TO CALL THE AUTO FEEDER, TO ADD NEW WATER. WHEN THE CONDESATE RELEASES IT OVERFILLS THE SYSTEM. ITS SEEMS LIKE A VENTING SITUATION. I SAY THIS BECAUSE IT SEEMS (THE CONDENSATION) TO BE RELEASED ALL AT ONCE.

Patrick Linhardt, \"Linhardt's Field Guide to Ste

vacuum breakers required with zone valves

Hi Paul,

If you have a zone valve in a steam system, a vacuum breaker is required after the zone valve (on the radiation side) to break the vacuum that is formed when the zone valve closes off. The symptoms you describe are typical of the problems that can occur when the vacuum breaker is not installed or not working.

Best regards, Pat

Patrick Linhardt, \"Linhardt's Field Guide to Ste

you are right

Hi Norm,

The trap before the zone valve is there to protect the valve from water hammer. A drip trap after can act as a vacuum breaker if conncted by dry return to a main vent, like a #75 that allows air back into the piping.

Best regards, Pat