| 1. | Opposite nip type line with rubber butterfly valve , metal hard seal eccentric butterfly valve , intensifying polytetrafluoro - ethylene soft ? sealing butterfly valve , low - load light type high temperature butterfly valve , fluorine - butterfly butterfly valve 对夹式衬胶蝶阀,金属硬密封偏心蝶阀,强化聚氟乙烯软密封蝶阀,低负载轻型高温蝶阀,衬氟蝶阀。 |