Booster pump issus

[Donato du plessis]

i am having trouble with my automatic pump flow control unit from mac afric.

How do i adjust the maximum presure or presure limit? It is curently running up to 7.5 bar and adjusting the screw at the top does not adjust the presure limit.

 

[soulie]

That screw doesn't adjust the flow rate, it adjusts the pressure differential. In the case of these units, this basically translates only to the "turn on" pressure.

In more detail; when you open a tap, the pressure drops. When it hits the set point (usually the screw allows an adjustment from 1.5-3 bar) then it turns on.

When you turn the tap off, the pressure rises again. When it hits the "turn off" pressure (also controlled by the screw, since the screw adjusts the differential) it signals the pump to turn off.

BUT with these units there is a ~10 second delay before the pump actually turns off. This delay is what causes the pressure to rise even further up to the pump's maximum pressure.

They put that delay in there to prevent fast on/off cycling of the pump when the flow rate is low.

You are quite simply a Google warrior and have zero clue as to how fluid switches work ,you went from I believe to stating facts overnight ,flow switches are different to pressure switches ,so go back to you're beloved Google for your facts ,so tell me how do you calibrate these units seeing as you know so much about them ,at what flow rate must the diaphragm lift ,how many Reed switches are involved and how does the current sensing work .your stupid reply as to 60 meters and a pressure is simply ridiculous and says clearly you are ignorant when it comes to fluid and dynamics ,you can also explain to the masses as to how centrifugal and peripheral pumps are set up by using current sensing,I don't think you even know the difference ,so bye enjoy Google

 

[tetrasect]

You are quite simply a Google warrior

I didn't need to google anything except the adjustment range which is commonly 1.5-3 bar.

and have zero clue as to how fluid switches work ,you went from I believe to stating facts overnight ,flow switches are different to pressure switches ,so go back to you're beloved Google for your facts ,so tell me how do you calibrate these units seeing as you know so much about them ,at what flow rate must the diaphragm lift ,how many Reed switches are involved and how does the current sensing work .

Nobody asked about reed switches. I simply corrected the nonsense you were talking. Funny how you can't find anything wrong with what I said and are instead trying to prove to everyone that you're the real expert.

Why don't you stand by your comments that I corrected? Like that cycling happens in high flow situations, not low flow situations, that the screw is to adjust the delay time, that the screw influences the flow rate etc.

It's because those statements are wrong, and you know it.

your stupid reply as to 60 meters and a pressure is simply ridiculous and says clearly you are ignorant when it comes to fluid and dynamics

Oh really? If you think any pump with a max head of 60 meters can supply 7.5 bar of pressure then it's clearly you who's the ignorant one.

,you can also explain to the masses as to how centrifugal and peripheral pumps are set up by using current sensing,I don't think you even know the difference ,so bye enjoy Google

You seem to "know so much" that you forgot the basics. And then you act like a child when I correct your false statements.

 

[kolaval]

Your advice is simply throw money at it. Unfortunately, us normal people dont have a R15k just laying around.

Wow when I bought mine it was R8k, times have changed.
Also it was the 3rd pump I bought, by that time I was fed up.

 

[Rickster]

Does OP want more or less pressure?

If less, then a simple valve after the pump/

 

[tetrasect]

Does OP want more or less pressure?

If less, then a simple valve after the pump/

OP signed up to myBB, started this thread, then left before the first reply. He hasn't been back since.

 

[upup]

I think I once saw a jojo pump with adjustable pressure.