Sterling Seal & Supply Style 9000 304 Stainless Steel Spiral Wound Gaskets with Flexible Graphite Filler are for applications with high temperature variations (thermal cycling),and/or pressure variations, and/or flange rotation problems etc., They are used where gaskets with adequate residual stress (stress retention),flexibility and recovery are needed and have been designed to meet these demanding requirements Spiral-wound gaskets are made of a preformed metallic strip and a soft filler material, wound together under pressure, and optionally with an inner and/or outer guide ring The metal strip holds the filler, resulting in excellent mechanical resistance, resilience and recovery A V-shaped crown centered in the metal strip acts as a spring, giving gaskets greater resiliency under varying conditions Centering ring accurately locates the gasket on the flange face, provides additional radial strength, and acts as a compression limiter.
Corrugated Metal Core gaskets faced with graphite supplied by Sterling Seal & Supply combines the sealing properties of the Flexible Graphite with the extrusion resistance of the corrugated metal core. The main advantage for using a metal core gaskets faced with flexible graphite is that it provides an extremely effective seal under low bolt loads. This makes the gasket ideal for applications where the available loading is determined to be low and unsuitable for spiral wound or other type of gasket requiring high seating stress.
A jacketed gasket has a construction composed of a soft filler material, wrapped by a metal outer layer. Often, this is a two-piece metal construction with a flat layer against the soft facing and a wrap layer that wraps at both sides to form a complete enclosure to encapsulate the filler. Jacketed gaskets perform well in high-pressure and high-temperature applications often need a rigid shield to resist blowout.
The Kammprofile gasket consists of a solid metal core, serrated on both sides and covered with a soft, conforming, sealing material (filler) that is bonded to each face. This soft facing produces a gasket with low seating stress. The combination of serration profile and soft sealing material work together so that the final compression of the gasket exhibits a profile of alternating metal and filler boundaries. This gasket is especially well suited for use in heat exchangers and other large diameter applications where a rigid, semi-metallic design, is desired for blowout resistance and ease of installation.
Solid gaskets are typically formed of metal and are a relatively inexpensive alternative to jacketed gaskets. They have high thermal and pressure resistance, though they require higher compression force to form a seal and are usually effective only against surfaces that are harder than the metal itself.
Oval (Style 377) and Octagonal (Style 388)
API ring Joint gaskets come in two basic types, an oval cross section (Style 377) and an octagonal cross section (Style 388). These basic shapes are used in pressures up to 10,000 psi. The dimensions are standardized and require specially grooved flanges. The octagonal cross section has a higher sealing efficiency than the oval and would be the preferred gasket. However, only the oval cross section can be used in the old type of round bottom groove. The newer flat bottom groove design will accept either the oval or the octagonal cross section. The sealing surfaces on the ring joint grooves must be smoothly finished to 63 micro inches and to be free of objectionable ridges, tool or chatter marks. They seal by an initial line contact or a edging action as the compressive forces are applied.
BX (Style 390)
The BX ring gasket differs from the standard oval or octagonal shape since it is square in cross section and tapers in each corner. They can only be used in API 6BX flanges. BX is used at pressures up to 15,000 psi. Standard sizes are stocked in low carbon steel, 304 and 316.BX
RX (Style 391)
RX ring gaskets are similar in shape to the standard octagonal ring joint gasket, but their cross section is designed to take advantage of the contained fluid pressure in effecting a seal. They are both made to API 6A and interchangeable with standard octagonal rings for oil field drilling and production applications in API 6B flanges. RX is used at pressures up to 15,000 psi. Standard sizes are stocked in low carbon steel, 304 and 316.RX 200px
SRX and SBX
Type SRX and SBX gaskets per API 17D for Subsea Wellhead and Tree Equipment are vented to prevent pressure lock when connections are made up underwater. They have identical measurements to RX and BX ring gaskets with the same number designation, and they will fit the same corresponding connectors. The "S" indicates these gaskets have cross-drilled holes, as fluid entrapment in the ring groove can interfere with proper make up underwater (subsea). With the vent hole, any water trapped between a ring groove bottom and the sealing area of the gasket can escape to the equipment I.D. bore. Material per spec is defined as a corrosion resistant alloy.
Style 377R (Rubber coated rings)
Style 377R is a rubber coated oval ring gasket (usually steel) used in pressure testing to minimize damage to flanges. The rubber contact points provide additional seals while protecting the flange surfaces.
Style 377T (Transition Rings)
Style 377T, combination rings combine two different sizes having the same pitch diameter permitting bolt up of differing size flanges.
Bridgeman (Style 393)
The Bridgeman gasket is a pressure activated gasket for use on pressure vessel heads and valve bonnets for pressures of 1500 psi and above. The cross section of the gasket is such that internal pressure acting against the ring forces it against the containing surface making a self-energized seal. Bridgeman gaskets are frequently silver plated or lead plated to provide a softer surface and minimize the force required to flow the gasket metal into the flange surface.
Delta (Style 392)
A delta gasket is a pressure actuated gasket used primarily on pressure vessels and valve bonnets at extremely high pressures in excess of 5000 psi. As with the lens gasket, complete drawings and material specifications must be supplied. Internal pressure forces the gasket material to expand when the pressure forces tend to separate the flanges. Extremely smooth surface finishes of 63 micro inches or smoother are required when using this type of gasket.
Lens (Style 394)
A lens type gasket is a line contact seal for use in high pressure piping systems and in pressure vessel heads. The lens cross section is a spherical gasket surface and requires special machining on the flanges. These gaskets will seat with a small bolt load since the contact area is exceedingly small and gasket seating pressures are exceedingly high. Normally the gasket materials should be softer than the flange. In ordering lens gaskets, complete drawings and material specifications must be supplied.