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The structural form of emergency shut-off valve and the cause of leakage
The author: Time:2020/11/23

       HG5-1588-84《液化石油气紧急切断阀》中规定:
       (1)切断阀按其功能可以为单纯紧急切断阀;与过流限.制阀组合,与过流限制阀及手动截止阀(或球阀)组合等形式。
       (2)结构形式可分为内置式、外置式等。
       (3)按其传动形式可分为液压式、气动式和机械等种类。
       (4)内置式切断阀与罐体的连接应采用法兰,密封面应为凹凸面或榫槽面型式。远罐端可用法兰与管道连接,或用快装接头直接与软管连接,外置式切断阀两端均采用法兰连接。
       紧急切断阀泄漏分为外部泄漏和内部泄漏。内部泄漏:紧急切断阀允许有一定的泄漏,规定单个阀在0.1MPa和2.2MPa的压力下,允许泄漏量不超过100mL/min。这个泄漏是在球阀开启的状态下测定的。若超过规定,便应检查主阀瓣、先导阀瓣的密封面,如有损伤应予修复。外部泄漏:应经常检查及紧固螺栓或更换密封垫,密封圈。紧急切断阀关闭后,如果泄漏严重,说明密封面已损坏,须研磨或修理。

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