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Old 06-26-2015, 10:16 PM
PhoenixTim PhoenixTim is offline
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Weathermatic Silver Bullet Diaphragm Head Scratcher

Last two days here in Phoenix have been very hot, about 115. Had two zones fail on successive days. All zones off yet had one running for hours. Turns out the diaphragm failed by being sucked or pushed down into the valve outlet; see picture. Happened two days in a row to two adjacent valves. System is 7 valves with a common pressure vacuum breaker (PVB). Valves are 1" WM 12000 series. Manifold is Dura. PVB is 3/4" Watts and it is located about 6-ft above the manifold due to 5-ft high terrace being served by the system. Is failure due to heat or height of PVB? Any other ideas?

All help appreciated,

Tim
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Old 06-27-2015, 05:52 AM
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How deep is the valve box? What's the static pressure?
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Old 06-27-2015, 01:28 PM
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RhettMan RhettMan is offline
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bad batch o'valves?
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Old 06-27-2015, 01:38 PM
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Quote:
Originally Posted by RhettMan View Post
bad batch o'valves?
Actually it looks more like a bad batch of diaphragms.
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Old 06-27-2015, 05:43 PM
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Is there any reinforcing mesh visible at the tear?
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Old 06-27-2015, 06:04 PM
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How old are the valves?
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Old 06-27-2015, 08:04 PM
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For anyone unfamiliar with those valves, they are reverse flow, so water pressure forces would tend to push the center of the diaphragm assembly downwards into the valve outlet.
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Old 06-28-2015, 06:24 PM
PhoenixTim PhoenixTim is offline
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I do not know the water pressure...will buy a guage and test it. The valves are only 1-2 months old. No visible mesh at the tear; appears to be just rubber/neoprene type material. Yes, these are reverse flow design; a high pressure would push the diaphragm into the outlet, which has happened; it was difficult to remove from the outlet. Here are pix of my system.
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Old 06-28-2015, 07:12 PM
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WOW, that might be heat related damage.
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Old 06-28-2015, 07:21 PM
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Maybe if we all get thirsty we'll go to Delgado's and get some "mezcal."
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