In one example, an example internal valve includes {HEAD ~ a body} having {TAIL ~ a valve seat} disposed between an inlet and an outlet 
In one example , an example internal valve includes { HEAD ~ a body } having { TAIL ~ a valve seat } disposed between an inlet and an outlet
OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH