Never depend on a check valve for safety reasons.
The reason is "lack of maintenance".
In your case, you are trying to stop a "inconvenient" back flow.
Here is your judgment factors.
1) Does a leaking check valve cause your bilge pump to continuously cycle when at Berth?
2) Can a check valve fail SHUT, thus prevent normal pump operation?
3) Do you want to verify good operations?
4) Do you want to remove, clean and service it?
The Jabsco diaphragm bilge pump MUST have working check valves to operate.
I would install one like in my post #17 and test it each time I left the boat at berth.
One gallon of water with food coloring in it, can be observed pumping over board and the bilge pump show to NOT be cycling. I use Blue bilge cleaner in my water test.
BTW test it before leaving on a Sail.
I have no check valve and do this test too.
Jim...
The reason is "lack of maintenance".
In your case, you are trying to stop a "inconvenient" back flow.
Here is your judgment factors.
1) Does a leaking check valve cause your bilge pump to continuously cycle when at Berth?
2) Can a check valve fail SHUT, thus prevent normal pump operation?
3) Do you want to verify good operations?
4) Do you want to remove, clean and service it?
The Jabsco diaphragm bilge pump MUST have working check valves to operate.
I would install one like in my post #17 and test it each time I left the boat at berth.
One gallon of water with food coloring in it, can be observed pumping over board and the bilge pump show to NOT be cycling. I use Blue bilge cleaner in my water test.
BTW test it before leaving on a Sail.
I have no check valve and do this test too.
Jim...