飞机的某些管路系统(如燃油系统、液压回油系统等)中,工作介质压力较低,但流量较大,为了满足其流量及压力损失的要求,往往需要采用较大管径的导管(外径为26～75毫米),以保证管路系统安全可靠的工作。为此,我们研制了导管扩口刚性连接标准,现简要介绍如下: In some pipeline systems (such as fuel system and hydraulic oil return system) of aircraft, the working medium pressure is lower but the flow rate is larger. In order to meet the requirements of flow and pressure loss, it is often necessary to use a larger diameter pipe (Diameter of 26 to 75 mm), in order to ensure safe and reliable pipeline system work. To this end, we developed a rigid standard connection of the mouth of the flare, are briefly described as follows: