(881,882,883,992、882F)铸钢法兰倒吊桶式
不锈钢外螺纹针型阀J21W,..
(304.316.316L)..
(881,882,883,9..
铸钢无磨损轨道锥塞阀GZS4..
PZ673X气动对夹式刀型闸..