View Full Version : ? about check valve water hammer

03/09/2007, 07:10 AM
In short, just set up a new 90g system. When I shut my return pump off, the check valve - which is mounted in the vertical position - begins to slam the valve swinging 'door' on the seat in rapid succession. I can't get it to stop. Anyone have any ideas? At my wit's end.........:mad2:

Any and all help will be greatly appreciated.

03/09/2007, 07:31 AM
Any reason to use a check valve, generally they are a complete pain, and often dont work due to stray snails etc


03/09/2007, 10:59 AM
anyone else?

03/09/2007, 01:22 PM
Eliminate the check valve. They are a mechanical device and will fail, probably when you are away from home or in bed at night if Murphy is looking over your shoulder. Seriously there is no reason to have a check valve in a return line if your returns and sump are designed properly. Same with drilled siphon break holes, they will plug and fail. The best option is keeping the returns close to teh surface and providing room in the sump to contain that known amout of backsiphonage. Its simple and it works every time.