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本标准适用于公称压力PN2.5～16MP_(?)~*,公称通径DN10～50mm,内螺纹连接的直通式锻钢阀门。内螺纹连接的直通式锻钢阀门的结构长度应符合下表的规定:
This standard applies to the nominal pressure PN2.5 ~ 16MP _ (?) ~ *, The nominal diameter of DN10 ~ 50mm, threaded female straight forged steel valves. Straight-through forged steel valves connected to the internal structure of the length of the valve should be consistent with the following table: