#5 give a good answer. ! G# `$ a H2 n& B# j. ^( y9 D" A. d8 z$ {
cause different pressure areas , we can just apply a small pressure to enable the poppet out ; G0 x4 ]: q. ?4 F6 n) f: g
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it should be a two stage valve. a little bit complex kind. once you get its working function. then it is easy for. u