{HEAD ~ Each carriage} is guided by a tongue and slot guiding arrangement, whereby sealing {TAIL ~ pressure} is applied between the valve member and the port plate 
{ HEAD ~ Each carriage } is guided by a tongue and slot guiding arrangement , whereby sealing { TAIL ~ pressure } is applied between the valve member and the port plate
HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH