What Is Blind Flange?

 Blind flange is like a flange cover, also called blind disk or flanged pipe plug. Blind flange has no holes in the center, for to seal the pipe opening. So it’s function is the same as the pipe plug or the pipe cap. The difference is blind flange is a detachable equipment, easy to replace or do maintenance.

Where to use blind flanges?

The blind flange’s the major function is totally to separate the production medium. Which preventing the shut-off valve close not tightly, then affecting production, and even causing accidents.

At the location where is requires isolation should place the blind flange, such as at the equipment nozzle. Between the front and rear of the shut-off valve or between the two flanges, it is often recommend to use a figure 8 blind flange (figure-8 blank); For single-use parts such as pressing and purging usually use common round blind flange.

Sealing Surface

There are many types of sealing surfaces, such as flat, convex, concave and convex, grooved surface and ring joint surface.

Casting Blind Flange

The shape of the the casting flange blank is accurate, has the small processing capacity, the cost is low, but there are casting defects (air hole crack inclusions); And the streamline of the internal casting part is bad (if it is a cutting part, the streamline is worse).

Forging Blind Flange

Forged blind flange generally have lower carbon content than cast flanges and are not easily to rust. Forgings have better streamlined shape, denser structure and better mechanical properties than cast flanges.