Stainless steel flange

For low-pressure pipelines, threaded flanges can be used, and for pressures above 4 kilograms, welded flanges can be used. Add a sealing gasket between the two flanges and tighten them with bolts. Flanges with different pressures have different thicknesses and use different bolts.

When connecting water pumps and valves to pipelines, the corresponding flange shapes are also made for the parts of these equipment, also known as flange connections. Any connecting parts that are bolted together in two planes and enclosed at the same time are generally referred to as "flanges", such as the connection of ventilation ducts, which can be called "flange type parts". However, this connection is only a partial part of a device, such as the connection between a flange and a water pump, so it is not appropriate to call the water pump a "flange type component". Smaller components such as valves can be called "flange parts".

A gasket is a circular ring made of a material that can undergo plastic deformation and has a certain strength. Most gaskets are cut from non-metallic plates or made by professional factories according to specified sizes, and their materials include asbestos rubber sheets, asbestos sheets, polyethylene sheets, etc; Metal gaskets made by wrapping non-metallic materials such as asbestos with thin metal plates (such as white iron sheet and stainless steel) are also used;

There is also a wrapped gasket made by winding thin steel strips and asbestos strips together. Ordinary rubber gaskets are suitable for situations where the temperature is below 120 ℃; Asbestos rubber gasket is suitable for situations where the temperature of water vapor is below 450 ℃, the temperature of oil is below 350 ℃, and the pressure is below 5MPa. For general corrosive media, acid resistant asbestos board is commonly used. In high-voltage equipment and pipelines, lens shaped or other shaped metal gaskets made of copper, aluminum, No. 10 steel, stainless steel are used. The contact width between the high-pressure gasket and the sealing surface is very narrow (line contact), and the machining smoothness of the sealing surface and gasket is high.

Low pressure small diameter threaded flanges are used, while high pressure and low pressure large diameter flanges are welded. The thickness of flange plates and the diameter and quantity of connecting bolts vary for different pressures.

National standard: GB9112-88 (GB9113 · 1-88~GB9123 · 36-88)

American standard: ANSI B16.5, ANSI 16.47 Class150, 300, 600, 900, 1500 (TH, LJ, SW)

Japanese standard: JIS 5K, 10K, 16K, 20K (PL, SO, BL)

German standards: DIN2527, 2543, 2545, 2566, 2572, 2573, 2576, 2631, 2632, 2633, 2634, 2638 (PL SO、WN、BL、TH）

Italian standards: UNI2276, 2277, 2278, 6083, 6084, 6088, 6089, 2299, 2280, 2281, 2282, 2283 (PL SO、WN、BL、TH）

British Standard: BS45044506

Ministry of Chemical Industry Standards: HG5010-52~HG5028-58, HGJ44-91~HGJ65-91 HG20592-97 (HG20593-97~HG20614-97) HG20615-97 (HG20616-97~HG20635-97)

Mechanical department standards: JB81-59~JB86-59 JB/T79-94～JB/T86-94

Pressure vessel standards: JB1157-82~JB1160-82 NB/T47020-2012～NB/T47027-2012

Marine flange standards: GB/T11694-94, GB/T376-1996, GB/T11693-94, GB10746-89, GB/T4450-1995, GB/T11693-94, GB573-65, GB2506-89, CBM1012-81, CBM1013, etc