Butterfly valve flange

Butterfly valve flange, also known as butterfly type one-to-one flange or clamp type butterfly valve flange or clamp type one-to-one flange, is a flange that matches the clamp type butterfly valve. The main difference between a one-to-one flange of a butterfly valve and a regular flange is the inner diameter of the flange. The inner diameter of the butterfly valve flange is a groove that exactly matches the nominal diameter of the required butterfly valve. This groove can be used to insert the connected steel pipe for welding, protecting the sealing effect of the butterfly valve. If a regular flat welding flange is used, the sealing effect of the butterfly valve will not be protected. In addition, the outer diameter, thickness, center distance, and bolt holes of the one-to-one flange of the clamp butterfly valve are the same, and the bolts used are double headed bolts. Due to the additional process of processing the inner groove of the flange for the butterfly valve compared to the flat welding flange, the price is slightly higher than that of ordinary flat welding flanges

The commonly used materials for butterfly valve flanges can be divided into carbon steel and stainless steel: carbon steel: (20 #, A3, Q235, Q23 excellent, Q235B, 20G, 16Mn, Q345, Q345R, ASTM A234WPB, ASTM A105, etc.); Stainless steel: (304, 304L, 316, 316L, S30408, S30403, S31608, S31603, SUS304, ASTM A403, TP321, TP317L, 347, 0Cr18Ni9, 00Cr19Ni10, 00Cr17Ni14Mo2, 1Cr18Ni9Ti, 06Cr17Ni12Mo2, 022Cr17Ni12Mo2, etc.)

Common execution standards for butterfly valve flanges:

Flanges American standards: ASME B16.5, ASME B16.47

Flange standards: GB/T9112-2010, GB/T9119-2010, GB/T9116-2010, GB/T9115-2010

Standards of the French Ministry of Chemical Industry: HG/T20592-2009, HG/T20615-2009, HG5010-52~HG5028-58, HGJ44-91~HGJ65-91, HG20592-97