The suction channel being configured to receive a valve member that controls {HEAD ~ flow} through {TAIL ~ the suction channel} 
The suction channel being configured to receive a valve member that controls { HEAD ~ flow } through { TAIL ~ the suction channel }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL