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性能规范：                                       阀门材料：铸铁、碳钢、不锈钢                          密封圈材料                                       天然橡胶（nr）-20～+85℃                           乙丙橡胶（epdm）-40～+125℃                       丁腈橡胶（nbr）-20～+82℃                             硅橡胶（si）-70～+150℃                           氟橡胶（fpm）-23～+150℃                          氟丁橡胶（cr）0～+80℃                            丁基橡胶（iir）-40～+100℃                         四氟乙烯塑料（ptfe）+10～+150℃                    采用标准                                        法兰连接尺寸：gb/t17241.6-98；gb9115-88                   结 构 长 度：gb12221-89                             压 力 试 验：gb/t13927-92                             适用介质：淡水、污水、海水、空气、蒸气、食品                    药品、各种油类、酸类、碱类、盐类等