Here is Layton's diagram of the full siphon.
The idea behind this method is to prevent the valve from ever getting air sucked into it, which makes all the noise.
Think of a bathtub, when you pull the plug out its pretty quiet up until the air starts getting sucked in and gurgling ect.
To stop the gurgling we need to install a smaller plug hole so that the amount of water exiting our bath is the same as that coming into with the tap (return pump) on so the water level doesn't drop.
To get the height where we want it, so no air is sucked into the plughole or splashing from the tap, the plug hole must be precisely the right size to allow the same flow of water out at a certain pressure (water height) than that coming in from the pump.
Water level * Valve hole size = Water flow in (constant)
So by making the valve hole size smaller (closing) the water level is going to need to be higher for the same flow.
Similarly, making the valve hole size larger (opening) this will drop the water level.
This is how we control the water level.
The pic doesn't really show it, but this is the reason you really need a method of prevent foreign objects (snails, big chucks of food :oops: ect.) from getting down the pipe and blocking the ball valve (making the valve size smaller) or it will raise your water level.
Several methods are:
- To drill heaps of little (4mm) holes in the pipe with a cap on top
- Use a stockman style preventative
- Whatever you brain can conjure up.
There is another advantage/disadvantage to this is that if the valve size has been set and the return pump changes the amount of water that it pumps (could be due to varing voltage, height of sump water level, old pump ect) this will mean that the water level will change:
Water level * Valve hole size (constant) = Water flow in
return pump pumps more, water level will be higher
return pump pumps less, water level will be lower
a summary to setup:
Slowly close the valve until the water level stops where you want it, come back later on; if too high open a little; if too low close a little. Continue until no more change. Then your good to go...
Sorry if I have complicated the issue but thats how I think of it :roll: