Flat welded flange is an excellent type of flange varieties, because it has the characteristics of light weight and small space compared with other flanges, it is loved by the public and plays an important role in the application of flanges. Let Rihua stainless steel flat welded flange manufacturers take you to see the sealing principle and connection of flat welded flange
Sealing principle of flat welding flange
The two sealing surfaces of the flat welded flange bolt squeeze the flange washer to form a seal, but this can also damage the seal. In order to maintain the seal, a huge bolt force must be maintained.
Therefore, the flange bolt should be made larger and needs to be matched with the larger flange bolt, and the larger flat welded flange nut means that a larger diameter bolt is needed to create conditions for tightening the flange nut.
However, this does not mean that the larger the diameter of the flange bolt, the better, because the larger the diameter of the flange bolt, the appropriate flange will bend and will only increase the wall thickness of the flange.
The whole device requires a large size and weight, which is also a problem for the gasket, because weight is always the main problem in this case.
In addition, the flat welded flange is a type of failure seal that requires 50% of the bolt load to squeeze the washer and 50% of the load to maintain the pressure.
Connection of flat welded flange
Flat welded flange is a kind of flange connected with utensils or pipes by fillet welding. It belongs to arbitrary type flange. According to the integrity of the connection between the flange ring and the straight cylindrical section, it should be checked against the integral flange or the loose flange.
There are flange rings with neck and flange rings without neck. The tight sealing principle of the flat welding flange: the two tight sealing surfaces of the screw squeeze each other to form a tight seal, but this is also the damage of careful and precise tight sealing.
To keep the seal tight, a lot of screw force must be maintained, so more must be done. Larger screws are needed to match larger nuts, which means larger diameter screws are needed to create conditions for fast nuts.
However, the larger the screw diameter, the flange used will become bent by increasing the wall thickness of the flange part.
The whole device requires a lot of size and weight, because in the case of this material, weight is the main issue that many people have to pay attention to. The threaded flange plate only conforms to the British pipe series. If it is suitable to use 60 taper pipe threads, the outer diameter of the steel pipe installed with DN65 flange should be 73 mm; DN125 flange. The outer diameter of the steel pipe should be 141.3mm.
