ORIGINAL: MinnFlyer
ORIGINAL: britbrat
I suspect that he is suggesting that the integrity of the seal will be protected by applying it to the high-pressure side -- the higher pressure tries to force the seal into the joint, rather than trying to balloon it out. Either way, it will work if it is properly sealed.
But the "high pressure" side changes as the control is deflected one way or the other. So there is never one high pressure side
Now you're applying logic -- that's not fun