When the first or second valve of {HEAD ~ the extension side or compression side pressure control valve} is opened, fluid is discharged from {TAIL ~ the guide bore} into either of the two chambers in the cylinder through the communication passages and the first or second check valve 
When the first or second valve of { HEAD ~ the extension side or compression side pressure control valve } is opened , fluid is discharged from { TAIL ~ the guide bore } into either of the two chambers in the cylinder through the communication passages and the first or second check valve
OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH