Replacement Method Of Sealing Ring Of Duplex Steel Flange.

The sealing ring of the dual-phase steel flange generates a self-sealing force under the action of the working pressure in the opposite direction, which increases the specific pressure of the seal, and the sealing ring compresses the seat. The greater the working pressure in the opposite direction, the greater the self-sealing force. So that the sealing ring and the valve seat are tightly combined to achieve the effect of two-way sealing.

In high-pressure equipment and pipelines, metal gaskets of lens type or other shapes made of copper, aluminum, No. 10 steel, and stainless steel are used. The contact width between the high-pressure gasket and the sealing surface is very narrow (line contact), and the processing finish of the sealing surface and the gasket is relatively high.

Dual-phase steel flange flanges are divided into threaded (wired) flanges and welded flanges. Low-pressure small-diameter wire flanges, high-pressure and low-pressure large-diameters both use welded flanges. The thickness of flanges and the diameter and number of connecting bolts are different for different pressures.

According to different levels of pressure, flange gaskets also have different materials, ranging from low-pressure asbestos gaskets, high-pressure asbestos gaskets to metal gaskets. It is divided into carbon steel, cast steel, alloy steel, stainless steel, copper, aluminum alloy, plastic, argon leaching, ppc, etc. by material. According to the production method, it can be divided into pushing, pressing, forging, casting, etc. A-type flat welding flanges generally only have flange rings, which are usually made of steel plates, and can be rolled by forgings if necessary. When connecting, it is directly connected to the cylinder or the head by fillet welding.