During an extension stroke of the piston rod, a damping force is generated by an extension side valve body, and at the same time, {HEAD ~ a valve opening pressure} of {TAIL ~ an extension side main valve} is adjusted by an inner pressure in an extension side backpressure chamber 
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During an extension stroke of the piston rod , a damping force is generated by an extension side valve body , and at the same time , { HEAD ~ a valve opening pressure } of { TAIL ~ an extension side main valve } is adjusted by an inner pressure in an extension side backpressure chamber
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH