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Hello,

I have a 900w 25L sterwins booster. It broke down (start / stop of the hyper-frequent pump with each use). I wanted to change the bladder but disassembling I saw that it was good :-( I took the opportunity to dismantle a lot of items for cleaning and when I reassembled everything I had a doubt on the connection of the small compressed air hoses (one on the pressure display mano and the other on the switch pressure switch.I do not know if a reversal is important or not. no more, but I was turning, I inverted my 2 little pipes and there she sucked but I had to stop her because she was leaving beyond the 3 bars I thought about the faulty pressure switch ... I just replaced it but it does not suck and whatever the configuration of my 2 small pipes.I tried with another strainer in a bucket of water but it did not change anything.I am dry :-). a can advise me

Try to drain your balloon completely, then you inflate to the air (the top, of course) to the pressure ad hoc, then you restart; Normally, it should be in order.

I did not really do as you said but after completely emptying the tank and pump body I put it back up, taking care not to leave air (playing on the purges) and it's gone . Thank you for your help.

Good!
It is a good precaution to provide a purge at the outlet of the tank (a faucet is best, because this is an additional point of draw).

The air constitutes the spring which accumulates the pressure; it can happen that this air escapes gradually without it being visible (it does not change the pressure), then the pump tends to shorten its cycles more and more (the pressure rises quickly during pumping, but also goes down again quickly when racking), since the "spring" decreases. It is then necessary to evacuate the water which occupies the part of the volume of air which has disappeared (although it always remains on its side of the membrane) in order to be able to reconstitute by inflation the initial volume of air.
In the case of old tanks without membrane, it is normal that the air in contact with the water dissolves gradually in it, which implies regular additions.

Ahmed wrote:In the case of old tanks without membrane, it is normal that the air in contact with the water dissolves gradually in it, which implies regular additions.

40 years ago, I had a piston pump that each cycle injected a little air into the balloon.
It worked a good twenty years ... then the pump dropped and it was replaced by a centrifugal pump, certainly with a higher flow, but without this feature and it is now necessary to drain the entire circuit and put back look every year ...

There were also membrane devices that insufflated a little air at each pump start (it is the pressure variation that actuated the membrane).