The operator member carries second cam means engageable with {TAIL ~ the latch} when the operator member has returned to {HEAD ~ its home position} to cause the latch to disengage the valve member and thereby to permit it to move to its closed position 
The operator member carries second cam means engageable with { TAIL ~ the latch } when the operator member has returned to { HEAD ~ its home position } to cause the latch to disengage the valve member and thereby to permit it to move to its closed position
OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH