about piston seals see the drawing in the attached
diaB=30mm.
the question is how to design the piston dia and the hole dia? Which standard?
and which standard the piston seals style can be founded in?
The seal manufacture should provide the groove information. If the manufacture is unknown make “C” the groove width close to the width of wear ring. The groove depth determines radial preload. Too much preload and the seal will run hot and wear out too fast. If there is not enough preload low pressure drift and hydroplaning can happen. I have used .012 to .020 per side preload without any problems.