Flange connection is the most commonly used connection form between valve
and pipeline or equipment. It refers to a detachable connection in which a flange, a gasket, and a bolt are connected to each other as a set of combined sealing structures. Pipe flange refers to the flange used for piping in the pipeline installation, and used on equipment refers to the inlet and outlet flanges of the equipment. The flange connection is easy to use and can withstand greater pressure. Flange connection can be applied to valves of various nominal sizes and nominal pressures, but there are certain restrictions on the operating temperature. Under high-temperature conditions, the connection bolts of the flange are prone to creep and cause leakage. The blue connection is recommended to be used at a temperature of ≤350℃.
According to the shape of the joint surface, it can be divided into the following types:
Smooth: for valves with low pressure. Processing is more convenient
Concave-convex type: high working pressure, a medium hard washer can be used
Tongue and groove type: gaskets with large plastic deformation can be used, which are widely used in corrosive media and have a better sealing effect.
Trapezoidal groove type: use an oval metal ring as a gasket, used for valves or high-temperature valves with a working pressure of ≥60kg/square centimeter
Lens type: The gasket is a lens shape and is made of metal. For high-pressure valve
or high-temperature valve with working pressure ≥ 100 kg/cm²
O-ring type: In the newer flange connection type, the sealing effect is more reliable than the general flat washer
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