Desirably said second valve includes {HEAD ~ a bleed path} which opens prior to full opening of {TAIL ~ the second valve} so as to effect a controlled release of pressure through said gas outlet 
Desirably said second valve includes { HEAD ~ a bleed path } which opens prior to full opening of { TAIL ~ the second valve } so as to effect a controlled release of pressure through said gas outlet
OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH