性能规范:公称压力PN2.54.0MPa壳体试验压力PT3.756.0高压密封试验压力2.754.4适用介质液化气、***等适用温度-40∽+80℃法兰连接标准JB/T79-94H41N-25/40止回阀通径(DN):25∽200（mm）压力（PN）：2.5,4.0MPa[H42N]主要外型尺寸和连接尺寸PNDNHDD1D2bfZ-φd2.5MPa4.0MPa2510511585651624-1432150135100781834-1840160145110851834-18501701601251002034-18651801801451202238-18802001951601352238-181002102301901602438-231503003002502183038-2520038036031027834412-25)