High pressure flange is a type of connector that is widely used in pressure vessels and pipelines, and is also a diverse type of component. But it cannot be said that the thicker the gasket, the better the sealing performance. This is because the conditions for establishing the initial seal vary depending on the thickness of the gasket. When welding large flanges, if the top forging pressure is too small, the deformation is insufficient and the joint strength decreases; If the top forging pressure is too strong, the deformation will be too large, the crystal grain bending will be severe, and the impact toughness of the joint will be reduced. However, socket welding cannot undergo radiographic testing, and magnetic particle or penetration testing can be used for testing. The bottom of the exhaust pipe of the safety valve should be equipped with a drainage pipe connected to a safe location, and valves are not allowed to be installed on both the exhaust pipe and the drainage pipe. When fully open or fully closed, the sealing surfaces of the ball and valve seat are isolated from the medium, and when the medium passes through, it will not cause erosion of the valve sealing surface