Our plumber was required to install anti-siphon outdoor hose connections, what I call sill cocks. They are a grand and glorious PIA It seems to me that the hazard of back-flow into the house plumbing is somewhere between zero and none!
The problem I have is that when LOML waters an individual plant/tree, she turn on the hose nozzle a little to get a small spray at the base of the tree. If she leaves the water pressure on full, we get a singing of the check valve in the sill cock which is transmitted throughout the house. If she opens the nozzle all the way and regulates the flow at the sill cock, the check valve doesn't work and dribbles water at a noticeable rate. I have talked to my plumber, and he has no answer.
The check valve assembly is permanently attached to the sill cock. The assembly does come apart for maintenance. I have looked at it, but there doesn't seem to be a way to defeat the check valve without having water squirting out around the valve.
The desk wedge who required this setup should be tied to an ant hill
(Wedge: the simplest tool known to man.)
My question to this fine group is: Does anyone know of a way to defeat this check valve? Is there an insert or repair piece which can defeat the check valve? Any ideas at all are welcome with the exception of trying to justify this device conceived in the underworld.