Re: Sump pump drain line siphoning air
Posted by e-plumber on December 18, 2003 at 17:46:05:
In response to Re: Sump pump drain line siphoning air
: My sump pump discharge drain pipe rises up from the pit to the basement ceiling and runs along the ceiling for about 30 ft till it exits to the rear of the house. My problem is that once the pit has pumped clear and the pump shuts off, the evacuating water in the drainpipe is still traversing along the ceiling. While the water is draining from the pipe, there is negative pressure behind the evacuating water in the pipe and air is sucked up through the pump and through the check value. This causes a sucking and bubbling sound for 30 seconds after each pumping cycle. I have been looking for some sort of in-line air vent value to relieve the pressure. Does any one know of such a vent?

Some sump pump discharge piping has 1/8" holes drilled in the piping below the check valve to prevent airlock but that would spit water and drain quickly once the pumps shuts.
I think your problem could be a defective check valve.
Good Luck. e-plumber

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