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Originally posted by brackishdude
So at too low flow, a siphon is not created because the air is not purged. You then are running a durso and an unmodified drain. This would either be quiet for lack of flow, or noisy/slurpy with higher flow.
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Yes and no. At a flow that low, then any standpipe will do. The volume is not sufficient to start a partial siphon in your overlfow and will therefore be silent.
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At too high a flow, a large enough proportion of the flow goes through the open/durso that it defeats the purpose (noise). More flow still, and the airhose is submerged, creating dual siphons.
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No. If the flow is high enough to create a siphon in the second (open) standpipe (by forcing the failsafe to be wetted), then your overall bulkhead capacity is much too low for two standpipes of that size. A siphon is the max flow you are going to get out of a standpipe. If you reach that on BOTH standpipes then you need more standpipes. See how simple!
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The gate on the siphon allows you to find the sweet spot for whatever flow your return pump generates.
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Yes, but it is not a sweet spot. The range is fairly large and the system is self tuning over a wide range.
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I would imagine that your plumbing allows for pretty wide range of flows, up to a wide open siphon on a 1" pipe. That would be tough for a return pump to keep up with.
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Exactly! At over 1500 GPH the valve is set for a 30% restriction of the flow. There is a LOT of headroom!
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So it begs the question, is your gate mainly open, mainly closed, or more like half way; and what is your pump's flow rate?
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I would guess around 30% restriction and close to 1500 GPH.