GOST 12820-80 PN40 Plate Flange
2016-11-14 10:05:23 COMMENT：0 HITS：
Manhole GOST 12820-80 PN40 Plate Flange according to the division it can be divided into through-hole, three holes, four holes and oblique through-hole man, specifically in Table 1 below. Among them, oblique through the hole is divided into 15 °, 30 °, 45 °, 60 °, 75 ° total of five. The angle of each oblique through hole can be applied within ± 7.5 °.
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