The present invention relates generally to {HEAD ~ valves} and, more particularly, to {TAIL ~ a bi directional flow control valve} which provides improved flow control characteristics 
The present invention relates generally to { HEAD ~ valves } and , more particularly , to { TAIL ~ a bi directional flow control valve } which provides improved flow control characteristics
OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH