Reduce beer pump flow with voltage regulator

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Old 04-16-19, 05:45 AM
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Reduce beer pump flow with voltage regulator

I'm looking for a solution to reduce the flow of this beer pump without buying a new one.

https://www.polsinelli.it/en/electri...20-b-P1041.htm

Would you say I can do it with a device like this or will it just stop as soon as the voltage goes below 220V?

https://www.aliexpress.com/item/AC-2...865999334.html

https://www.aliexpress.com/item/EU-P...863780139.html

https://www.aliexpress.com/item/AC-2...957672458.html

Thanks
 
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Old 04-16-19, 06:04 AM
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It seems like the cheapest and easiest way to reduce the flow is to put a ball valve inline on the outflow side and leave the handle about 1/2 closed. Play with it until you get the flow rate you want.

A voltage or frequency controller depends on how the motor is wired. Unless you know the internal schematic of the motor construction you can't select an effective electrical controller.
 
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Old 04-16-19, 08:13 AM
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Genius.
That's exactly what I'll do.

Thanks!
 
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Old 04-16-19, 08:20 AM
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Yes, put a valve on the output/pressure side of the pump. Do NOT restrict the inlet/suction side but you can restrict the output. When I'm sparging I have the flow down very low but I open it up when I'm transferring the wort to the fermenter.
 
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Old 04-16-19, 10:03 AM
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You do need to be aware that restricting the pump outflow will increase the load on the pump/motor.
The specs say that the pump can handle a 25 meter head which is about 80 feet.
Water is about .5 pounds/ft of head so if you put a gauge at the pump but before the restricting valve you could develop about 40 psi without overloading pump.
If at 40 psi you still have too much flow then you can try restricting the inlet but have to watch for cavitation and its effect on the beer.

If restricting either end of the pump doesn't work out you could consider looking to see if a different impeller is available.
 
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Old 04-16-19, 10:38 AM
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If your brew setup is large enough you can use a recirculation loop but at that point I'd just get another, smaller pump. You pump the wort out and back to the tank in a loop. From that loop you tap off where you want your low flow. Normally you have a valve on the output of the loop and on the low volume tap. By varying the two you can get whatever flow you want without forcing the pump to run choked down. The downside is the extra piping, valves and required cleaning.
 
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Old 04-29-19, 12:51 AM
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Just as a follow-up, I tried the solution to reduce the flow with a ball valve on the outflow side of the pump, but you could tell the pump didn't really like it according to the noise.

So I ordered a voltage controller and so far it works

https://photos.app.goo.gl/qV2t5zHZF5DNxKFS7

The only concern I have now is whether working at a lower voltage could damage the pump, but we'll see.

If it breaks down, I'll post it here.
 
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Old 04-29-19, 05:02 AM
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Yes, operating a motor below it's rated voltage can damage it. If the load is light it should be OK though. Just keep an eye on it's temperature. If the motor gets unusually hot you may need to come up with a different plan.
 
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