Besides being a permanent restriction, which reduces flow and promotes clogging, check valves can fail to open.
If you improperly install the wrong type of bilge pump or float switch, or plumb it incorrectly, enough water can back-flow to cause cycling of the pump. This often happens with centrifugal pumps when the float switch is set too low, and there is a long discharge run.
Alternatively there are switches that continue to run the pump for a few seconds after a normal switch would have shut down. A diaphragm
pump can also be used to dry the bilge.