Jabsco water pump- how to reduce water pressure

[tmtracey]

My freshwater pump is a Par Max 2.9 - 31395-0392. It’s the 40psi version, installed by the previous owner. Also has a n accumulator.

It has an issue where it continues to run even once the taps are turned off. It recently blew a pump off a barb fitting due to the continuous pressure.

I’m planning to get a new pressure switch. I was thinking I probably don’t need 40psi - is it possible to put a 25psi rated switch on this pump? It might be kinder on the system and stop this problem reoccurring.

 

[Boater Sam]

Square D make an adjustable switch that you plumb in line.

 

[PCUK]

No reason not to fit a 25psi switch if you can conveniently get one.

 

[tmtracey]

Are the 25psi and 40psi pumps the same pumps only with different pressure switches?

 

[tmtracey]

Do the diaphragms go on these things? I have run it dry a few times when emptying the tank. That may be another reason for the continuing pumping (according to the manual).

 

[vyv_cox]

Do the diaphragms go on these things? I have run it dry a few times when emptying the tank. That may be another reason for the continuing pumping (according to the manual).

No, they are designed to run dry, not indefinitely but for quite long periods.