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Unread 02/03/2008, 11:37 AM   #6
BeanAnimal
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Join Date: Feb 2003
Location: Pittsburgh
Posts: 20,772
Thansk for the compliments Arthur and brackishdude.

To answer your question:
Quote:
BeAn, would it be better to put the siphon-drain valve lower, say just above the sump?
It is not needed. Let me try and explain.

Both the top of the standpipe and the bottom of the standpipe are submerged. No air can be introduced at either end. A restriction anywhere in the pipe will control the overall flow (velocity)through that pipe. Any air already in the pipe will either be purged or form an air pocket at the top of the TEE. The piping system below the valve should be the same size as the piping system feeding the valve. The LONGER the piping system, the larger the difference in head pressure. That equates to a higher capacity siphon.

If the lower pipe was significantly larger, then there may be some sound from free falling water because it would not take up the entire cross section of the pipe.

We can also consider a VERY LONG piping run, to the basement for example. In this case the head difference would create an extremely strong suction, possibly enough to cause problems. In this scenario, the setup would best be served by a valve at the sump end.

So with that in mind, I preferred to place the valve where it can be easily adjusted.


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