The longitudinal movement of {TAIL ~ piston} 96 causes longitudinal movement of valve pin 31 which is threadably mounted to {HEAD ~ piston} 96 at 100 
The longitudinal movement of { TAIL ~ piston } 96 causes longitudinal movement of valve pin 31 which is threadably mounted to { HEAD ~ piston } 96 at 100
OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH