lumphammer
Well-Known Member
As the title - is there a way to slow down flow rate? Maybe some sort of choke valve in outlet, or using less powerful pump e.g. Jabsco 1.9?
Jabsco 2.9 pump - slowing down flow rate?
- Thread starter lumphammer
- Start date
pvb
Well-Known Member
Doesn't the tap control the flow rate?
Graham_Wright
Well-Known Member
Probably better to restrict the output rather than the input. If the latter, you would starve the supply and maybe damage the rotor.
What's it used for?
What's it used for?
CLB
Well-Known Member
change it for one of the variable rate jabsco pumps?
VicS
Well-Known Member
I think its a diaphragm pump. Restricting the outlet should cause no problems if it is and it will even run dry without damage
Last edited:
Plum
Well-Known Member
I recently fitted one of these https://aerohydraulics.com/hose-tail-x-hose-tail/ as an isolation valve to help me do a partial drain-down for a short spell of freezing weather. You could put it just after your pump, or better still, just after your accumulator if you have one, and throttle the flow rate.
Www.solocoastalsailing.co.uk
pvb
Well-Known Member
Why would you want to throttle the flow rate? The tap does that, just don't turn it on full.
Spyro
Well-Known Member
That's the pump I have and that's how it works. Turn the tap on just a bit and you get a dribble. Full on it scoots out.
Richard10002
Well-Known Member
Why do you want to slow down the flow rate?
VicS
Well-Known Member
Perhaps replacing the tap with one that is more controllable would be a cheaper option that changing the pump!
pvb
Well-Known Member
It wasn't Spyro who asked the original question though, he's just confirming what I'd posted - the tap controls the flow rate.
ashtead
Well-Known Member
I can only think the OP is blowing off his pipe connectors at 2.9 which didn't happen at 1.9 maybe ? Maybe he's fed up with washing out his bilges with nice hot water from the calorifier ?
pvb
Well-Known Member
The pressure settings are identical for the 2.9 and 1.9 pumps, so there'd be no difference.
ashtead
Well-Known Member
Thanks for that pvb why would anyone buy the 1.9 then? We replaced ours with the 2.9 on last boat but I just wondered based on your advice.
pvb
Well-Known Member
Don't know. They're about the same price. Max outputs are 7 litres/min vs 11 litres/min. I suppose if you just have one tap the smaller one would be OK. If you want to run a shower the larger one would be better.
ashtead
Well-Known Member
Thanks pvb for that . Seems there might be little reason then on basis most boats would be running at least 2 taps and a shower output or 2 with a calorifer system .
Hydrozoan
Well-Known Member
I do not know if it is relevant to any of the discussions here, but the 12V 2.9 Par Max comes in two variants I believe:
31395-0292, 1.0/1.7 bar https://www.jabscoshop.com/marine/p...-0292-par-max-29-pressure-controlled-pump.htm
31395-0392, 1.4/2.7 bar https://www.jabscoshop.com/marine/p...-0392-par-max-29-pressure-controlled-pump.htm
31395-0292, 1.0/1.7 bar https://www.jabscoshop.com/marine/p...-0292-par-max-29-pressure-controlled-pump.htm
31395-0392, 1.4/2.7 bar https://www.jabscoshop.com/marine/p...-0392-par-max-29-pressure-controlled-pump.htm
lumphammer
Well-Known Member
yes it does - but with the tap fully open water splashes everywhere and it would be nice not to have to remind anyone who doesn't want an impromptu shower not to turn the tap full on,
Daydream believer
Well-Known Member
If you do change them then may I suggest that you get the old one & place it at a convenient point , controlled by a switch. Connect a 10ft length of hose to it & i also have an adapter with a piece of 1/4 inch copper pipe on it. Mine then discharges to an outlet overboard.
So now if I get some water under the engine, under the sink, under the floor boards etc which is too small to trigger the float switch I can go round with the hose & hoover up the last drops. With the 1/4 inch copper pipe I have a hole drilled in the cabin floor boards & poke it through & it will suck up that last drop that irritatingly comes out the sides when the boat heals. Being 1/4 inch it will remove depths to virtually nothing
So now if I get some water under the engine, under the sink, under the floor boards etc which is too small to trigger the float switch I can go round with the hose & hoover up the last drops. With the 1/4 inch copper pipe I have a hole drilled in the cabin floor boards & poke it through & it will suck up that last drop that irritatingly comes out the sides when the boat heals. Being 1/4 inch it will remove depths to virtually nothing
pvb
Well-Known Member
Just fit a service valve in the pipe(s) to the tap and control the max flow that way. You'll retain full flow for a shower.