Metal Seals

Recently the company has formed a Joint venture to manufacture Metal o-ring, C-ring seals and Spring energised c-rings under the brand name, HTMS FUTOM.

General Information
High Performance Seals for extreme service conditions.

Development and Engineering of new products is conducted in close cooperation with universities. In house testing equipment facilitates real hardware testing and comparison with FEA results. The Oysterseal® in this catalogue is one of the results of this bespoken cooperation.
Sealing Concept
The sealing performance of resilient Metal Seals is based on a the relative high specific contact load at the sealing line and a certain resiliency or spring back of the elastic metal seal. The seating load and the corresponding sealing line width, are a function of the selected seal type, cross section, material, material thickness and the alloy properties itself. Depending on the required tightness and the media to be sealed, a specific seating load will be required. Plating or coating with soft, ductile material will provide better sealing by filling up groove imperfections. The seating load will make the ductile layer to flow and fill up the groove surface irregularities. Resilient Metal Seals require a controlled compression. Typically these seals are installed in a machined groove, or the compression is limited by a so called retainer plate.

General Properties
Sizes: Diameters from 5 mm to 7 meter.
Cross section from 0,8 mm to 12,5 mm.
Temperature: Cryogenic to +750°C.
Pressure: From ultra high vacuum to +500 MPa.
Available in circular, race track, oval and other shapes.
Excellent resistance to corrosion and radiation.
Maintains elasticity or spring back over an extended service life.
Does not suffer from explosive decompression.
Capable of reaching tightness better than 10–9 mbar.l/s.
Radiation resistant.

Material Selection
The application parameters determine which material should be used.
Temperature and media are important aspects in selecting the material.
HTMS offers materials such as 321 stainless steel, Inconel® and other high temperature alloys.

Metal O-ring: Specifications and Applications
The metal o-ring seals of Kwality products can be used where non-metallic seals will not seal properly or do not offer the required reliability for the application, usually due to temperatures, pressures, or the environment. Metallic O-Ring Seals are long lasting seals and unlike non-metallic seals, they are not subject to failure due to incompatibility with the environment, out gassing or from deterioration due to age. O-Ring Seals are generally fabricated from tubing consisting of stainless steel or high temperature alloys such as Inconel (currently in development). These materials are frequently used because they offer resilient properties that enable the seal to "Spring-Back".
Hollow metal O-Rings are used as static face type seals and should not be used as a dynamic seal. While the majority of seals are circular, many seals are produced in rectangular, racetrack, and other various shapes and configurations with limitations only on the corner radii.

The following are key elements in specifying the proper seal determining the base material:
  • Temperature limits/duration
  • Media to be sealed
  • System pressure
  • Available seating load

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