[budman 1984]

i installed a sump pump 5 years ago or so. it only is needed 2-3 times a year. However, when it is needed there is one thing that drives me INSANE!! I put the pump in the pit and connected PVC to go up about 40 in and over about 20 in and out to the garage. I put a "check valve" at the end of the PVC and that is where i attach the flexible hose and run it out to the curb. The problem is that when the pump stops running, there is a "rattle" in the PVC as the water drains back down the PVC and into the pit (i presume thats the cause) Why doesnt the check valve prevent that noise from occuring?? I thought that was the point of using the one-way valve in the first place. I think the problem is that there isnt proper venting for the water that is in the hose when the pump stops. What do i need to do to eliminate that NOISE?? Any help is appreciated!!