GB T3037-94 Marine Double Eccentric Type Butterfly Valve1. ApplicationGB T3037-94 Marine Double Eccentric Type Butterfly Valvae vulgo ad naves reficiendas et ad aedificandas naves adhibita. Materia (I) corpus: fusile ferrum (2) discus: aluminium aes (3) truncus: chalybs immaculatus. Materia huius producti potest fieri ad ordinem, ut: ferrum iactum, chalybs immaculata 304, chalybs immaculata 316L etc.