{TAIL ~ A bi directional flow control valve} includes a two port housing, and {HEAD ~ a hollow cage} within the housing 
{ TAIL ~ A bi directional flow control valve } includes a two port housing , and { HEAD ~ a hollow cage } within the housing
TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH