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Sunday, November 25th 2012, 9:08am

Weathermatic valves staying open with aire pressure but stay closed with water pressure

I just did a blowout on a four zone system with weathermatic valves. The valves stay closed just fine with water pressure on them but when i hook the air up to them they will not close. I am running 50 PSI and 20 CFM. I have blown out hundreds of systems like this and never ran into this problem.


Supreme Member

Posts: 4,215

Location: Metro NYC


Sunday, November 25th 2012, 1:35pm

Are these the Silver Bullet valves?

By the way, it is possible for a compressor air to build up ice in a valve, if the conditions are just right, like when the weather is cold and humid. I have once or twice been forced to open the water supply and run the zones, to warm up the valves enough to defeat this phenomenon.

This post has been edited 1 times, last edit by "Wet_Boots" (Nov 25th 2012, 6:01pm)

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