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#1
01-23-2014, 07:03 PM
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If you put a second valve in then surely you will end up doing twice as much fine tuning. I would just have the one valve closer to the sump
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#2
01-23-2014, 07:43 PM
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My gate valves are in my stand 30" from tank.
Pipes drop down 8' in to the sump and the outlet is just a tad under the waterline in the sump. I have no noise at all so I would think it's your union causing the noise. I would also be bothered with going up and down the stairs to adjust the gate valves. Tuning my herbies is a PIA, just too finicky. I miss my dursos.
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#3
01-23-2014, 07:55 PM
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The further away the valve is from the sump the harder it will be to tune, it can be done but it takes longer for it to "settle" after each adjustment. The issue relates to the pressure difference over the valve and the further away the valve is from the sump the higher the vacuum effect after the valve which is ultimately what causes the noise (almost like cavitation). Adding an additional valve at the sump level is a decent solution, even if it's just a ball valve, it will allow you to reduce the pressure difference on the first valve and hence reduce the noise there while also making it easier to tune.
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