对于工业蝶阀，法兰还是标准连接方式。
Flanges are also the standard connection for industrial butterfly type valves.
标准的法兰连接，通用性好。
With the NEMA standard flange connection, keep the good universal.
根据国内垫片标准规定的泄漏率指标和美国PVRC对连接系统划分的紧密度等级，尝试定义了法兰连接系统的安全性等级。
An attempt was made to define the safety grade of flanged connections according to target leakage rates described in domestic gasket standards and tightness rates of joints stated in PVRC of ASME.
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