Varieties and Structural Configurations of Stainless-Steel Flanges - Chinese 6-inch Galvanized Pipe Flange.

Stainless steel flanges are ubiquitous in pipeline engineering and are typically used in pairs to connect pipelines. Various pipeline components feature flanges for interconnection. Threaded flanges are suitable for low-pressure pipelines, while welded flanges are preferred for pressures exceeding 4kg. Bolts are used to fasten two flanges together, with sealing points added in between. Flanges vary in thickness and bolt specifications based on their pressure ratings. Additionally, components such as water pumps and valves are equipped with flange shapes to facilitate their connection to pipelines, known as flange connections.

Next, let's delve into the varieties of stainless-steel flanges and their structural configurations. 

13 types of stainless-steel flanges

The classification of stainless-steel flanges aligns with that of other materials, encompassing 13 common types, outlined as follows:

50. Flat welding flange: The pipe is inserted into the inner ring for welding. 
50. Butt welding flange: A flange with a neck and a smooth transition section welded directly to the pipe. 
50. Socket welding flange: This flange connects to the pipe via socket welding. 
50. Threaded flange: This type of flange features threads for connection with the pipe via a threaded connection. 
50. Slip-on flange: This flange is slipped over the pipe end and is typically used with a flange stub or welding ring. 
50. Special flange: These are flanges with non-circular shapes, such as diamond flanges, square flanges, etc. 
50. Reducing flange: This type of flange allows for connection to a standard flange, but the nominal diameter of the nozzle is smaller than that of the standard flange nozzle. 
50. Flat face flange: A flange where the sealing surface is flat and is on the same plane as the entire flange surface. 
50. Raised face flange: A flange with a sealing surface that protrudes slightly above flange as the whole surface. 
50. Concave and convex flange: Consists of a pair of flanges, one with a concave shape and the other with a convex shape. 
50. Tongue and groove face flange: A set of flanges featuring a protruding tongue and a matching groove to ensure precise alignment during assembly. 
50. Large stainless-steel flange with ring connection surface: The flange's sealing surface features a ring groove structure. 
50. Large stainless steel flange cover: A circular plate with bolt holes connected to the end of the pipe flange to seal the pipe. Various protective measures are often applied to prevent rust and surface damage on large stainless-steel flanges, including electroplated coatings such as yellow zinc or white zinc on carbon steel flanges, brushing with rust-proof oil, or spraying with anti-corrosion paint. 

What are the structural configurations of stainless-steel flanges? 

The structural configurations of stainless-steel flanges are categorized as follows: 

Smooth type: Suitable for low-pressure stainless-steel valves, characterized by easy processing. 

50. Concave-convex type: Ideal for high-pressure applications where a medium-hard washer can be utilized. 
50. Tenon and groove type: This type is suitable for gaskets requiring significant plastic deformation, especially in corrosive media, and offers excellent sealing performance. 
50. Trapezoidal groove type: Utilizes an oval metal ring as a gasket, commonly employed in valves operating at pressures ≥ 64 kg/cm2 or in high-temperature environments. 
50. Lens type: Incorporates a lens-shaped metal washer suitable for high-pressure valves operating at pressures ≥ 100 kg/cm2 or in high-temperature conditions. 
50. O-ring type: A relatively recent innovation in flange connections was developed alongside the introduction of various rubber O-rings. 

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