GDQ-J50(b)/KF,GDQ-J150(b),GDQ-J400(b),GDQ-S400(b),气动高真空挡板阀(带波纹管密封) GDQ-J50(b)/KF,GDQ-J150(b),GDQ-J400(b),GDQ-S400(b), 无锡油研流体科技有限公司