#5 give a good answer. . O5 B! V& W- y0 S; [2 F0 @. q f K4 F& j+ v9 J* Y8 W
cause different pressure areas , we can just apply a small pressure to enable the poppet out 5 U& Q# O0 [7 v0 u2 w2 p
" q3 m" J* Y0 B" z" ]it should be a two stage valve. a little bit complex kind. once you get its working function. then it is easy for. u