One-way or check valves in bilge pump line

[dLj]

Not sure if this has been mentioned but what about a loop and a check valve? Check valves would achieve the OP's goal and the loop would serve as a backup

The more you add impedance in the exit line, the less gallons per time period (pick your time units) you can pump.

Impedance is affected by head height (I can't change that) any bends (what you are suggesting) and things like one-way valves (what my question was asking). Essentially anything in the exit line the pump has to push water through will reduce the actual, vs theoretical or rated, pumping speed of the pump.

I'm not understanding the advantage of adding in a loop after a check valve might be.

In any case, given this discussion, I'm leaving the system as is. There is really no problem with the amount of water in.my bilge given how deep it is.

dj

 

[dLj]

In the H-34, The bilge discharge hose runs from the top of the keel over to starboard then aft of the galley and then up to under the toerail to an anti-syphon loop then out through a through hull just below the toe rail. Lots of hose. My air conditioner pan is below the waterline and drains into the bilge as does the icebox drain.

So I wonder what effect being heeled over with that exit hole below the water has on pumping ability. It may actually make it faster as you may have reduced head pressure. I have no idea...

dj