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Looking at options for pumps I see that most people go for the magnetic drive centrifugal type pump and throttle them using a ball valve.
I would prefer a pump that I can vary the speed of rather than just choking the output. Is it possible to fit a speed controller to the standard centrifugal pump? Or can you buy variable speed pumps? What options are out there?
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Stick a speed controller on it. However I wounder about the size of the pump needed for a homebrew size and slowing that down, wounder if it will get blocked to easy?
wort is pretty thin... I doubt it would get blocked too easy??
What sort of speed controller? Is it a separate piece of electronics you can simply pick up??
keep an eye on trade me for vfd or vsd-variable frequency/speed drive i believe you need a 3 phase pump but the vfd lets you power it from single phase,this is how the brewer at the local micro has his pump.maybe it would work with a single phase pump?- you'd need someone who understands electronics to go into more detail.
can you control peristaltic pumps?there's a thread somewhere on here where the guy made his own!
i think most people go the magnetic drive option because when cost,batch size and ease of use are taken into consideration it comes out the winner,all the other options i looked at were either too expensive for me or overkill for the brewery size.
I picked up a Hot water booster pump off TM for bugger all, $1 reserve. My plan is to use a speed controller as its only 90 Watt pump. I can get speed controllers for about $45. As I'm still only building my set up at the moment haven't tried it yet. I figure Ill try this first and if it doesn't work ill have to invest in a magnetic drive pump.
How you control the speed depends entirely on what type of motor it is, and there are many different kinds of motor. See http://en.wikipedia.org/wiki/AC_motor to get an idea of some of the variations. Many of these would need a different type of speed controller.
Using a magnetic drive centrifugal pump and controlling the flow with a valve is probably the most reliable and economic way to do it for a small motor. Both factors mean that you can't overload the motor, and power consumption will be small enough not to be a concern.
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