Metal Jacketed gaskets, as the name suggests, consist of a metallic outer shell with non-metallic filler.
The filler material gives the gasket resilience, while the metal jacket protects the filler and resists pressures, temperatures and corrosion.
Metal Jacketed gaskets are available in a wide range of sizes and configurations.
They are traditionally used for heat exchanger applications, pumps and valves; although the resilience and recovery properties of these gaskets are limited. In order to seal effectively, Metal Jacketed gaskets require smooth flange surface finishes, high bolt loads and flange flatness.
Single Jacketed Gaskets
The filler material is enclosed in a metal jacket which covers the inside and outside diameter of the gasket. Typically used on low pressure applications, including boilers, compressors, pumps, and diesel and gasoline engines.
Minimum gasket width: 6.4 mm (1/4“). Standard gasket thickness: 3.2 mm (1/8”)
Style 120 has one of its contact surfaces covered and is ideally suited for comparatively narrow flange widths in circular and non-circular configurations. Not recommended for standard pipe flanges.
Style 124 is an overlapped Single Jacketed Gasket, where the filler is completely enclosed on the inside and outside diameters and on both contact surfaces. It is suited for high temperature applications of narrow flange widths.
Double Jacketed Gaskets
Double Jacketed Gaskets are used on boiler and heat exchanger applications when ample bolting is available to correctly seat the gasket. They are designed for high pressure and temperature applications up to ANSI class 900.
Gasket widths as narrow as 8 mm (5/16″) can be manufactured depending on diameter. Very large gasket diameters can also be produced. Standard gasket thickness is 3.2 mm (1/8″).
Gaskets can be manufactured with either integral or welded pass partition bars, in a variety of complex configurations.
The filler material is completely enclosed by a two piece metal jacket, which covers both the inside and outside diameters and both contact surfaces.
Style 126 is similar to style Style 123 with the exception that the metal jacket is formed from a corrugated jacket providing better resilience than the Style 123, since the corrugations form multi-seals across the flange sealing face.
Style 127 is a double shell gasket constructed of two reversed wrap-round shells. This provides superior flange support and handleability and provides better resistance to high pressures.