#5 give a good answer. 2 L X( w% m0 f6 o! a9 q
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cause different pressure areas , we can just apply a small pressure to enable the poppet out 9 Z' E6 x: ~1 w5 O0 U' ?2 H7 J
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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