闸 阀主要零件材料:阀体、阀瓣、阀杆、密封、填料密封:304,316填料:聚四氟乙烯阀杆:304,316阀体:WCB 阀瓣:304,316闸 阀主要零件材料:阀体、阀瓣、阀杆、密封、填料密封:304,316填料:聚四氟乙烯阀杆:304,316阀体:WCB 阀瓣:304,316闸 阀主要零件材料:阀体、阀瓣、阀杆、密封、填料密封:304,316填料:聚四氟乙烯阀杆:304,316阀体:WCB 阀瓣:304,316