Is there any reason you can't run the gate on one line and leave the other open channel? Unless you are planning hard-core flow it would be more reliable, require less water pulled from the sump prior to achieving full siphon.
Combining two lines into a single gate will cause one to pull air often if you do not have an open channel line as well.
Whoa. Can you explain this further? I have 2 siphon drains into one gate valve. Mine is silent, but it does make noise if the gate is not set right. Interesting thing is, I've never been able to figure out where the noise (air) comes from. It's not getting sucked into the siphon drain in the overflow box. I've checked for air leaks in the pipe under the tank. Never did figure it out.....I'm wondering if it has something to do with tying two drains together, or the long horizontal run before the gate valve.
Once I got mine running quiet, I just forgot about it. But, I'd like to know more about this whole tying drains together thing. Some say never do it. Others say it's no problem, it's the better way.
How or why would one siphon drain draw air if their tied together?
