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I recently installed the anti siphon valve on my 28 hp Volvo diesal engine. I am having some trouble with it. Whenever I push throttle up to where I am going 3 knots it seems the pressure from the impeller dislodges the flapper valve , resulting in water spewing out of the unit. I have tightened it as much as I can but does not make a difference. Any suggestions or similar problems?
You can pull the valve apart in about 2 minutes. Did you cut off the ends that go into the hose? Sounds stupid but if a 1 inch hose and you keep the 1/2 inch barb fitting on the valve you will get restricted water flow.
A down hill blockage is also a possibility but your cable is more likely.
I changed it because the previous one required me to manually open it when not in use and to close before I started the engine.
Also top of loop was only 6 inches above water level.
Nothing is blocked downstream from the valve. The unit is sealed how do you take it apart?
Had a mechanic look at it and he had no suggestions.
My unit has no screws on top. The L shaped tube comes out the side at the top of the loop. I am beginning to think I bought the wrong unit. This winter I will have my own version fabricated out of steel with some sort of thumb valve installed at the top of the loop.
Of note when I winterized my engine this week (took her out early do to vaction plans) I noticed that when I ran the antifreeze through the engine much more was going into the Vetus valve than was coming out. I figure there must be a blockage in the valve.
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