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