NK/DSJ41H-16C DN250真空水封截止阀 ¥223.00 NK/DSJ41H-16C DN300真空截止阀 铸/碳钢法兰式水封真空隔离截止阀 ¥223.00 NK/DSJ41H-16C DN350真空截止阀水封隔离法兰截止阀 ¥223.00 NK/DSJ41H-16C DN400法兰型/对焊型 水封截止阀 真空水封截止阀 ¥223.00 NK/DSJ41H-16C DN450铸钢法兰手动真空阀水封截止阀 ¥223.00 NK/DSJ41H-16C DN500铸钢水封截止阀法兰真空截止阀门 ¥223.00