my house was built 5 yrs ago we had the basement rough plumbed for a toilet, shower and vanity. In the pump well they only installed a sump pump and told me when I finished the basement I would need to install an ejection pump. When the sump pump would come on then shut off it would bang and rattle the plumbing. So my contractor tried moving the shutoff/one way valve higher up the discharge line. Well that did not help. Now that I have finished my basement I replaced the sump pump and valve with a zoeller sewer ejection pump and zoeller valve. I installed it according to the installation instructions and I still have the banging noise when the pump shuts off but it is not as bad as it was. Any ideas on how to get rid of the banging noise? My father who is a retired carpenter suggested I put a rubber coupler in the discharge line to absorb the shock of the pump shutting off. I havent tried that yet. Thanks Dan
COMMUNITY FORUM
That noise is the closing of the check valve when the pump stops. Try to get the pipe away from direct contact with studs & walls etc... If it is stuff some insulation between the pipe and the wood or wall. The noise can be quieted but not eliminated. The rubber connector might help also. C.
Could try this. On the vertical side of the pipe after the check valve install a 2 inch tee or wye then a 45 ell or 90 ell to a 2 foot riser with a cap on top. This is referred to as a water hammer arrester or air chamber. It is like a shock absorber. It is used on water supply lines to cut down on noise from quick closing valves. If you install this let me know how it worked out. Thanks. C.
Try a soft seat check valve.
If a check valve flapper closes to fast and a slow closing type should be installed.
A brass flapper because it is metal and closes quickly slams closed thus causing hydraulic shock.
Soft seat check valves or even a good quality PVC type can prevent this condition
ALSO it is important to make sure there is a hole drilled as per directions of the manufacturer to prevent a vacuum condition that also can cause noisy conditions
If a check valve flapper closes to fast and a slow closing type should be installed.
A brass flapper because it is metal and closes quickly slams closed thus causing hydraulic shock.
Soft seat check valves or even a good quality PVC type can prevent this condition
ALSO it is important to make sure there is a hole drilled as per directions of the manufacturer to prevent a vacuum condition that also can cause noisy conditions
