The flange surface on the pipeline should be perpendicular to the center line of the pipeline, and the position error between the flange bolts and the center of the pipeline should be within the allowable range. Before installation, the centerline of the valve and the pipeline should be the same.
Spectacle Blind Flange, as its name implies, is shaped like a figure of eight. It has a blind plate at one end and a throttling ring at the other end. When fluid is transported, the throttling ring is used, and the blind plate is used when cutting off, which is a bit like a shut-off valve.
Spectacle Blind Flange products are a kind of piping parts, which are mainly used to facilitate 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 development history of my country's concentric reducer industry has been nearly 40 years, and the concentric reducer products have been widely used in various fields of the national economy and national defense industry.