Holes are present on the flange, allowing bolts to be threaded through, securing the two flanges together. Gaskets are used between the flanges for sealing.ink_feGed" href="https://baike.baidu.com/item/%E6%B3%95%E5%85%B0%E8%BF%9E%E6%8E%A5/2365845?fromModule=lemma_inl法兰连接Composed of a pair of flanges, a gasket, and several bolts and nuts. The gasket is placed between the sealing surfaces of the flanges. After the nuts are tightened, the gasket deforms upon reaching a certain pressure on its surface, filling in the uneven areas of the sealing surface, ensuring a tight and leak-proof connection.