SSdoxie
Elite Member
It's my guess that the valve does not have "regen" built into the spool so the orifice is there to slow down oil leaving the rod end during dump to keep cylinders from cavitating. If that ofrice is not "one way acting" it will slow down the curl. A one-way restrictor would have a spring behind it and the orifice hole is part of a poppet, so when oil is flowing from the spring side out it restricts the flow. When flowing into the orifice towards the spring it will puhs the spring back and allow full flow.