Products:metallic gaskets for pipe flanges R Ring-joint octagonal gasket
Standard: ASME B16.20
Material: Carbon Steel,Stainless Steel 304,Stainless Steel 304L,Stainless Steel 316,Stainless Steel 316L,
Used: For Pipe flange ASME B16.5,ASME B16.47 Series A,ASME B16.47 Series B etc
metallic gaskets for pipe flanges R Ring-joint octagonal gasket introduction:
Octagonal gasket is a solid metal gasket with a cross-sectional shape of octagon made of metal material through forging, heat treatment, and mechanical processing. It has a radial self tightening sealing effect and is a type of standard R-type metal ring gasket. Its working principle is that the cushion pad contacts the inner and outer surfaces (mainly the outer surface) of the flange ladder groove, and is compressed to form a sealing effect
metallic gaskets for pipe flanges R Ring-joint octagonal gasket dimension and tolerance:
Shape: Octagonal, Elliptical
Scope of application: Temperature: -200-800 ℃ Pressure: 2.0-42 megapascals
Suitable for flange sealing of high temperature and high pressure pipelines.
The octagonal metal ring gasket is installed in the ladder shaped groove on the flange surface. When the connecting bolt is tightened, it is compressed axially and pressed against the upper and lower ladder shaped grooves, causing plastic deformation and forming an annular sealing band, establishing the initial seal. After the pressure is increased, the ring gasket expands radially under the action of the medium pressure. The gasket is more tightly attached to the inclined surface of the trapezoidal groove, creating a self tightening effect. However, the increase in medium pressure can also cause deformation of the flange and connecting bolts, resulting in relative separation between the sealing surfaces and a relative decrease in the sealing ratio of the gasket. Therefore, the gasket can be considered a semi self tight seal.
The octagonal metal ring gasket matches the flange groove mainly by surface contact. Although it is not easy to achieve a tight fit with the flange groove compared to the elliptical ring gasket, it can be reused and is easy to process due to its straight cross-section. At the same time, the hardness of the octagonal metal ring gasket material should be 15-20HB lower than that of the flange surface.
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