R-spool: Internal hydraulic regeneration
– Combines B to P in spool!
– Blocked center, so cylinder could creep
R3-spool: Internal regen
– connects B-to-P path inside housing
– Center P blocked, A and B to T
R5-spool: Internal regen with 4-position press-regen spool
– P-to-A full tonnage below 33%
– Regen above 33% (like R3)
Internal regen flow can not exceed limits of main valve (lower flow than external regen)
