On Tue, 04 Nov 2003 15:27:25 GMT, "Andrew Koenig" wrote:

long explanation of trapped air problem snipped

Think about adding an automatic air venting valve.

Go to mcmaster.com and search for 4928K3

If you can add this to the high spot of the section that can trap air,
it should do the trick with no problem. They can dribble a few drops
now and then when it is venting, but you could put it under a sink or
somewhere else safe.

Also, think about whether or not moving the check valve to the other
end of the line it's in would help the situation. It shouldn't matter
where in the line it's located as long as it faces the correct
direction.

HTH,

Paul