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