{HEAD ~ The operation pipe} is actuated and drives {TAIL ~ the piston and piston valve} in the perpendicular direction 
{ HEAD ~ The operation pipe } is actuated and drives { TAIL ~ the piston and piston valve } in the perpendicular direction
HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH