so if you have a valve and oil flowing through it... then you shut off the valve... I assume that most of the oil will stop flowing and the pressure will basically be 0 at the valve and atmosphere at the end of the pipe... so if from left to right you had a shutoff valve then a 5' hor. run then 10' vert. rise then 10' hor. run then a 15' vert. drop and then a 15' hor. run then there is essentially open end pipe into a furnaceoh and its 1/2" steel pipe.so do you think the atmospheric pressure will hold in most of the oil? I set this up with rubber hose and tried it... it wasnt the same size and it was rubber and water, but most of the water stayed in the line... maybe the original velocity of the fluid will create a siphon or something I'm not thinking about? Maybe the oil will leak out over a long amount of time? Trying to use my memory of 1 semester of fluid mechanics here... hopefully someone with more experience can help... I asked this in another forum yesterday, so sorry if someone finds it here too... just looking for some opinions from some valve people.

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