I'm not sure if I understand your question so if my reply sounds stupid either I don't understand your question or I'm just stupid
First I think you are referring to a milking machine with the automatic on and off claws, and you are saying that even though the side is done milking it doesn't automatically come off.
Well, they won't unless there is a break in the vacuum. Depending on the does teat size they may just suck up on the teat and continue sucking a dry teat.
For instance if you put your hand over the inflation and there is a decent seal then the disc should drop and you should feel suction on your palm. There's no milk coming from your palm.
With that type of claw when a side is milked out you have to break the vacuum to get it to shut off. I usually grab the inflation in my hand and then take my thumb and push against the milked out teat to let air so it shuts off.
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Second, I think you are saying on one inflation that the milk is backing up in the inflation.
This can be caused by several things.
One would be that your pulsator is set on 50/50 pulsation rather than 60/40 so it has a longer rest period and can back up. I hate the Surge buckets because their pulsators are 50/50 and then with the narrow lines there is a lot of back flush.
It's also possible that your pulsations per minute are either too slow or too fast.
Another would be that your automatic on and off claws are of the unvented variety and if they are unvented, or the little hole on them is stopped up the milk can back up or move backward up into the inflation when the pulsator is on the rest phase.
Yet ANOTHER thing is you may have really good milkers with really big orifices and they are hosing it and flooding out the system.
And ANOTHER thing could be that your milk line is going up before it goes down into the bucket so gravity is working against you.
I had a doe, heavy milker, hoser that would flood out the lines a lot of times.
I'm running one of the big plastic delaval style buckets with an Interpulse L80 set at 60/40 pulsation and the silicone inflations, and on off claws that went into a plastic Y and then into the 5/8 silicone milk line.
I ended up having to buy one of the vented Vanguard claws to put in place of the "Y" because it was cutting the milk flow down too much and resulting in backflushing.
I don't like the milk backing up because probably increases the chances of stuff being spread doe to doe.
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I don't know what to tell you about your disk shutting off while there is milk in the inflation.
The only thing I can think could cause that would be a leak somewhere where the inflation joins the claw because if all that was solid milk in the inflation should cause the claw to open. Also a small amount of vaccum still gets past the disc, so milk in the inflation should be pulled out by the claw slowly even if it is shut off.
Can you describe your system?
