Types of stainless steel flange gaskets

Flange gasket is used for pipe flange connection. It is the seal between two flanges. The medium, pressure and temperature directly affect the selection of flange gasket. Various gaskets are often used for flange connection, which helps to improve the sealing performance of the connection.

Generally, the types of gaskets include graphite gaskets, metal gaskets, asbestos rubber gaskets, etc. The three types of flange gaskets are different in use characteristics. Here we share the types and characteristics of the three types of stainless steel flange gaskets.

Metal gasket

The tooth form is the conical tooth ripple machined on the sealing surface of the metal flat gasket - applicable to the sealing surface of the concave convex flange; Octagonal and oval gaskets - applicable to the sealing surface of trapezoidal groove flange; Lens gasket -- The metal gasket used for lens flange sealing surface is made of pure iron, very mild steel, stainless steel, aluminum and other materials. The requirements for the machining accuracy and surface roughness of the sealing surface of the metal gasket are very high, and the bolt compression force is very large. The metal coated graphite gasket used for high-temperature and high-pressure valves is made of thin metal coated annular asbestos gasket. It is generally used for the sealing surface of concave convex flange. Suitable for valves with higher temperature and pressure.

Asbestos rubber gasket

Asbestos rubber gasket is used for medium pressure valves with high temperature, and is suitable for smooth flange sealing surface, concave convex flange sealing surface and tenon groove flange sealing surface. The advantages are good corrosion resistance and thermal stability, good plasticity, and small compression force to ensure sealing. The disadvantage is that the strength is low and it is easy to stick to the flange sealing surface. Asbestos rubber gaskets include universal asbestos board, anti-corrosion asbestos board, and asbestos board, acid resistant asbestos board, oil resistant asbestos board, metal wire asbestos board and other materials are generally used.

Graphite gasket

Graphite gasket is a flat gasket made of soft graphite, suitable for high temperature and strong corrosive media. It is used for tenon and groove sealing surface, mainly made of PTFE and glass fiber reinforced PTFE, and used for strong corrosive media with low temperature and various pressures. PTFE gasket, etc.

What needs to be emphasized here is that the flange gasket can help to act as a buffer at the connection, effectively avoid the direct contact of steel plates, and prolong the service life of the flange.