Flange connection:
This is the most used in the valve connection form. According to the shape of the combined surface can be divided into the following:
1. Smooth: for low pressure valve. Processing more convenient
2. Concave and convex type: higher working pressure, can be used in the hard washers
3. Groove type: plastic deformation larger washers can be used, is widely used in the corrosive medium, the sealing effect is good.
4. Trapezoidal trough: metal elliptical ring as a gasket. Used in the working pressure is more than or equal to 64 kilograms / square cm of the valve, or high temperature valves.
5. Lens type: washer is a lens shape, with metal production. For 100 kg / cm2 high-pressure valve working pressure is greater than or equal to, or high temperature valve.
6. O ring type: This is a relatively new form of the flange connection, it is with the emergence of a variety of rubber O ring, and developed, it is in the form of sealing effect.
