I got a new self priming !
As you recommended , I got a 1HP self priming ( that have some jet effect i think) that can give 4 bar ( 58 PSI) without depending on city pressure
I connected it in the traditional way to the pressure tank and the pressure switch and works fine because the city pressure today is 30PSI so the pressure switch setting of 50/75 is working fine
The problem now is the pressure fluctuation during the shower as I said before ....
And because the CSV is not available in my country ....
One day , I have got an idea from this wonderful forum about a fitting that can be fixed at the downstream that can do almost the same effect of a CSV, a check valve with a 5mm diam hole drilled in its diaphram and to be fixed just before the pressure tank and pressure switch groupe , that is supposed to DELAY the time that the pressure tank would take to fill and reach the cut out pressure and supposed to keep the pump running continuosly when there is a big faucet fully open ( like the shower for example)
I did this job today but it did not work , the pump can still fill the tank and reach the cut out pressure WHILE THE SHOWER TAP IS FULLY OPEN
What I am thinking to do next is , to replace this ( modified check valve ) by (a pressure bypass valve- with adjustable pressure setting - and a proper check valve assembly) for the water going in and coming out from the pressure tank )
Does that make any sense ? If not , then how I can make the pump run continous during the showr ?
It would be nice if the pump itself was not capable of doing damage. That's the advantage of using a jet pump for pressure boosting. I would still not abandon the idea of finding a suitable jet pump, since you'd only need half a horsepower, versus the 2 HP you're talking about. But if you can only use products by Ebara, you take what they got.
(pokes around the Ebara website, while muttering curses about tech sites using frames)
Try these for size ~ if that link works, you are looking at their 'self-priming' pumps, and some of them are jet pumps They even say so
There is a 'hidden' danger to using booster pumps, which happens if the pump is too strong in comparison to the water supply. The pump will create 'negative pressure' in the supply lines upstream of it, and an underground leak in said lines becomes a source of contamination, and a danger to health. This 'negative pressure' problem is averted by selecting a pump that is incapable of moving more water than the supply line can deliver. And that's where a fractional-horsepower jet pump comes in. Even if you tried a multistage pump, you can find a fractional-horsepower model that has a limited flow capacity. Limited pump flow equals pressure-boosting safety.
As you recommended , I got a 1HP self priming ( that have some jet effect i think) that can give 4 bar ( 58 PSI) without depending on city pressure
I connected it in the traditional way to the pressure tank and the pressure switch and works fine because the city pressure today is 30PSI so the pressure switch setting of 50/75 is working fine
The problem now is the pressure fluctuation during the shower as I said before ....
And because the CSV is not available in my country ....
One day , I have got an idea from this wonderful forum about a fitting that can be fixed at the downstream that can do almost the same effect of a CSV, a check valve with a 5mm diam hole drilled in its diaphram and to be fixed just before the pressure tank and pressure switch groupe , that is supposed to DELAY the time that the pressure tank would take to fill and reach the cut out pressure and supposed to keep the pump running continuosly when there is a big faucet fully open ( like the shower for example)
I did this job today but it did not work , the pump can still fill the tank and reach the cut out pressure WHILE THE SHOWER TAP IS FULLY OPEN
What I am thinking to do next is , to replace this ( modified check valve ) by (a pressure bypass valve- with adjustable pressure setting - and a proper check valve assembly) for the water going in and coming out from the pressure tank )
Does that make any sense ? If not , then how I can make the pump run continous during the showr ?