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Re: bilge pump system with mulitple bukheads???
It sounds like you have 1 very large pump, and wish to have 4 pipes, 1 sucking from each compartment?
Usually in smaller boats you have a smaller pusher type submersable pump in each compartment.
The purpose of watertight bulkheads is to prevent a sinking if one compartment is flooded. Having a seperate pump for each compartment accomplishes this, (the redundancy is the number of compartments, it is not neccessary to have redundant pumps in each compartment as would be if the boat had NO bulkheads.
I.E. My 36 ft boat has one bilge running the entire length of the boat, I have two bilge pumps one forward, one aft that are on seperate batteries, one on ehouse, one on engine starting, one has a higher float than the other and comes on only if the first one is overwhelmed.
Since you have multiple bulkheads 1 pump each, is twice the redunduncy of my boat already.
If you really want the one pump rules all method, there is in fact a solution. Parker makes a sealed solenoid valve that operates from 12vdc, (or 24vdc), it comes in a variety of sizes from 1/4" to 4", their 3/4" or 1" valves should be in the ballpark of what you need. Simply plumb one valve in line to each pickup, and wire to a float switch in that compartment. When the float activates it will open the correct solenoid, as well as signal the very large master pump to turn on. Problem solved.
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