WJ41H-16 25 40暗杆式德标波纹管截止阀 BGL41H-150LB 300LB美标波纹管截止阀 API Standard bellow globe valve WJ41H-16-40国标波纹管截止阀 WJ41H-16明杆式德标波纹管截止阀 OS&YTYPE Din Standard bellow globe valve