Peggy, I installed a anti syphon valve at the top of the loop for my raw water intake hose for the head. Now it doesn't flush properly or should I say it doesn't rinse well. When I pump the flush handle very little rinse water comes into the bowl and you can here air escaping from the valve. If I put my finger over the vent hole then I get a very strong rinsing flush. Should I have not put a anti syphine valve at that location? I was trying to keep the bowl from filling up with water from the intake. Did I install it improperly?
Vented loop Poor flush
- Thread starter Gary_H
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Yup, if it's between the intake and the pump. It should be between the pump and the bowl. Review your head manual, or find one online, they show the proper location.
You put the vented loop in the wrong place
If you'd read the installation instructions for your toilet--for ANY toilet, you'd have seen that the vented loop in the intake has to go between the pump and the bowl, not between the thru-hull and the pump as shown in this photo...'cuz when a vented loop is installed between the thru-hull and pump, flushing pulls air into the line preventing the pump from priming. So what you're hearing is not air escaping from the loop, but air being pulled into it to prevent a siphon from starting. Also notice that it has be at least 6-8" above waterline AT ANY ANGLE OF HEEL, not just at rest...which, on most sailboats puts it at least 2-3 FEET above the toilet. You'll also find a lot of discussion about where to put it in this forum.
And, if you can put your finger over the hole in the loop, the loop is also missing its air valve. The air valve only allows air to be pulled INTO a line, Air valves are replaceable parts that require removal for cleaning and occasional replacement, so they're often sold separately.
So if you move the loop to the right location and put an air valve in it (without one, water will squirt out the hole, so you do need it), your problem will be solved.
However, as long as you do have to move it, this could be a good time reroute the intake line to tee it into the head sink drain line. See the discussions in this forum on the advantages to doing that.
If you'd read the installation instructions for your toilet--for ANY toilet, you'd have seen that the vented loop in the intake has to go between the pump and the bowl, not between the thru-hull and the pump as shown in this photo...'cuz when a vented loop is installed between the thru-hull and pump, flushing pulls air into the line preventing the pump from priming. So what you're hearing is not air escaping from the loop, but air being pulled into it to prevent a siphon from starting. Also notice that it has be at least 6-8" above waterline AT ANY ANGLE OF HEEL, not just at rest...which, on most sailboats puts it at least 2-3 FEET above the toilet. You'll also find a lot of discussion about where to put it in this forum.
And, if you can put your finger over the hole in the loop, the loop is also missing its air valve. The air valve only allows air to be pulled INTO a line, Air valves are replaceable parts that require removal for cleaning and occasional replacement, so they're often sold separately.
So if you move the loop to the right location and put an air valve in it (without one, water will squirt out the hole, so you do need it), your problem will be solved.
However, as long as you do have to move it, this could be a good time reroute the intake line to tee it into the head sink drain line. See the discussions in this forum on the advantages to doing that.
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