According to the different types of flange sealing surfaces, the commonly used flanges are three types: flat flange, convex flange and grooved flange.
The sealing surface of the flange is flat, and the contact area with the gasket is large. After pre-tightening, the gasket is easy to extend or move to both sides, and the sealing is poor, and only suitable for low pressure places.
The convex flange and the groove surface flange have good sealing performance and are suitable for places with higher pressure.