Hydraulic valve

[Varmint1]

This valve came off of an 941. Can anyone tell me if its single acting or does it work double (pressure and return)

 

[Soundguy]

i'd see what's under that silver headed 'bolt'

if it is another oil port. it may very well be a da valve, however in SA mode. many do this with a small valve you turn / screw in.. more modern ones use a sleeve sometimes..

ports may be 3/8 orb.. which by the way is 9/16 fine bolt thread.. non taper. which is what that 'bolt' may be...