{HEAD ~ The stem} is axially movable within {TAIL ~ the annular protrusion} between at least a first position in which the orifice is closed when the valve stem first end sealingly abuts the valve seat and a second position in which the orifice is open when the valve stem first end is offset from the valve seat 
{ HEAD ~ The stem } is axially movable within { TAIL ~ the annular protrusion } between at least a first position in which the orifice is closed when the valve stem first end sealingly abuts the valve seat and a second position in which the orifice is open when the valve stem first end is offset from the valve seat
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