{TAIL ~ An internal valve} 7, further comprising {HEAD ~ a biasing element} to cause the equalization member to move to the at least third operating position when the piston is at the second piston position 
{ TAIL ~ An internal valve } 7 , further comprising { HEAD ~ a biasing element } to cause the equalization member to move to the at least third operating position when the piston is at the second piston position
TAIL TAIL TAIL TAIL TAIL TAIL TAIL 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 OTH OTH OTH