Non-metallic gaskets should be less than 2mm;Flanges with metal composite gaskets, oval gaskets and equipment should be less than 1mm. Wrong holes - pipe flanges are concentric, but the chord spacing of the two flanges is large relative to the diameter of the bolt hole (or the diameter of the bolt hole center, etc.).The chord distance of the diameter of two adjacent bolt holes can be ±0.5mm. The gap between the opening and flange is too large.

The allowable opening value of graphite filler between the two flanges (excluding the prestretching of the pipe and the thickness of the gasket or blind plate), the flange opening of the pipe shall be less than 3mm;Lan should be less than 2mm. Wrong opening - pipe and flange are vertical, but the two flanges are not the same.For bolt hole diameter and bolt diameter composite standard parts.

Bolts can be inserted freely into bolt holes without the use of other tools.Reducer flanges: mainly used for the connection of motor and reducer, and the connection between reducer and other equipment.Butt welded flanges are pipes used to transfer pressure to reduce high stress concentration in the flange base.