J41N-25C、J41N-25P、J41N-25R、燃气截止阀、液化气截止阀 面议 J41N-40C DN125碳钢不锈钢氨用截止阀 WCB铸钢法兰单向阀 面议 碳钢法兰截止阀 J41N-10P 暗杆氨用阀设计合理南高 面议 J41N-10R 不锈钢316法兰氨用截止阀J41N-16P 不锈钢截止阀 面议 J41N-16C 氨用截止阀 DN15-250密封可靠、无外漏 面议 不锈钢 法兰截止阀 J41N-16P 耐腐蚀耐高温蒸 汽阀 J41N-25P 面议