Decompression

With large rams you might need to consider decompression.
We know that oil compresses at around 0.5% of volume per 1000psi.
A large volume ram can have a considerable volume of compressed oil and when suddenly released through the control valve may cause a bit of a bang!
This can be reduced by a decompression valve that allows the pressure to bleed off more slowly before allowing the main valve to fully open.
Some Pilot operated check valves have this feature and some control valve spools have flats ground onto the leading edges.
I remember years ago when we needed to get ourselves out of trouble we would take the spool to the hand grinder. But best not mention this to anyone!
Very best
Bob