Blind flange, also known as blind flange, the real name is blind flange. It is a connection form of flange. In fact, it is a flange without a hole in the middle. Spectacle Blind Flange is one of them.
Spectacle Blind Flange is a kind of pipe fittings, mainly for the convenience of inspection and repair. You can know the specific shape by painting the upper part of the "8" black. It is half a blind plate and half an iron ring. Commonly used for pipeline flanges that need to change the process. The materials are mainly carbon steel, stainless steel, alloy, and can be selected according to the pipeline pressure level and the pipeline medium.
Significance of Spectacle Blind Flange
It is usually used on pipelines with larger pipe diameters. Usually, one end of the flange is used to occupy the spacing to keep the pipeline unblocked, and when necessary, the other end is replaced with a blind plate of the same thickness to cut off the pipeline. Avoid the forced expansion of the pipeline due to the temporary replacement of other blind plates, affecting the entire system.
 Several systems of Spectacle Blind Flange standards in the world
1. Flange connection or flange joint refers to a foldable connection that is connected by flanges, gaskets and bolts as a set of combined sealing structure. Blind plate refers to the flange used for piping in pipeline installations. On the equipment, it refers to the inlet and outlet flanges of the equipment.
2. Several systems of international pipe flange standards
1) European flange system: German DIN (including the Soviet Union)
a. Nominal pressure: 0.1, 0.25, 0.6, 1.0, 1.6, 2.5, 4.0, 6.4, 10.0, 16.0, 25.0, 32.0, 40.0MPa
b. Nominal diameter: 15-600mm
c. Flange structure type: flat welded plate type, flat welded ring loose sleeve type, crimped loose sleeve type, butt welded crimped loose sleeve type, butt welded ring loose sleeve type, butt welded type, strong threaded connection type, integral Type and flange cover
d. Flange sealing surface includes: flat surface, concave surface, concave-convex surface, tongue and groove surface

3. my country's national standard system for eight-character blind board GB
1) Nominal pressure: 0.25MPa-42.0MPa
a. Series 1, PN1.0, PN1.6, PN2.0, PN5.0, PN10.0, PN15.0, PN25.0, PN42 (main series)
b. Series 2, PN0.25, PN0.6, PN2.5, PN4.0
Among them, PN0.25, PN0.6, PN1.6, PN2.5, PN4.0 have a total of 6 grades of flange sizes, which belong to the European flange system represented by German flanges, and the rest are America represented by American flanges. Flange system.
In the GB standard, the maximum nominal pressure level belonging to the European blind plate system is 4MPa. The maximum nominal pressure level belonging to the American flange system is 42MPa.
Spectacle Blind Flange supplier, the company has a variety of flange models, various specifications, complete models, support customization, immediately email consultation!