{HEAD ~ Movement} of the shaft and {TAIL ~ vent} follower continues until the pressure between the two cells is equalized and the vent follower is once again in direct relation to the vent 
of
{ HEAD ~ Movement } of the shaft and { TAIL ~ vent } follower continues until the pressure between the two cells is equalized and the vent follower is once again in direct relation to the vent
HEAD HEAD HEAD HEAD HEAD REL OTH OTH OTH TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH