A simple structure is realized by using {HEAD ~ a common guide bore} for guiding {TAIL ~ the extension side valve body} and the compression side valve body 
A simple structure is realized by using { HEAD ~ a common guide bore } for guiding { TAIL ~ the extension side valve body } and the compression side valve body
OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH