H44铸铁止回阀铸铁旋启式止回阀主要技术参数公称压力MPa试验压力MPa使用介质壳体密封1.0～1.61.762.4水、蒸汽油品水、油品、蒸汽应用规范设计与制造GB/T12235连接端尺寸结构长度GB/T12221法兰尺寸JB/T79检验与试验JB/T9092材料碳钢GB/T12229不锈钢GB/T12230合金钢Q/ZB66标志GB/T12220供货JB/T7928主要零件材料阀体、阀盖、阀瓣密封圈衬套垫片灰铸铁不锈钢黄铜橡胶石棉板灰铸铁黄铜主要外形尺寸口径DN(mm)40506580100125150200250350300400450500600700800L20023029031035040048050055072062082010001000130014401440D1451601801952152452803353905004405656156707808951010H120130142160178203233262300392320448485525580625625H41铸铁升降式止回阀主要外形尺寸口径DN（mm）管螺纹G（in）尺寸（mm）LL1SS0H151/29014273060203/410016273662251120183046753211/4140203655854011/2170223660955022002446751106521/2260265090128803290306011015010043503565160170)