#5 give a good answer. + [& a }2 `4 h! K( v* y; _7 d5 m) V+ ^- x
cause different pressure areas , we can just apply a small pressure to enable the poppet out ) C$ ]( e$ r/ A6 ~4 z
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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