Hollow metal O-ring is composed of thin-walled seamless tube made of bent butt ends of the circular. It is at temperatures above the non-metallic seal or gasket can adapt the temperature is particularly effective as a static plastic seal member. It is made of three different forms:
An ordinary ring for grooved couplings (closed).
2 Self-Empowerment (or system enabling) circle with holes or openings so that the inner ring cargo seal pressure system pressure the same.
Filling pressure ring 3, which is filled with inert gas around 42bar (typically nitrogen) common circle.
Hollow metal O-shaped sealing ring is compressed by the circle corresponds to the cross section of 20 to 25% the amount of compression caused by the predetermined height. Resilient metal surface roughness or surface parallel error provided some compensation, but for the purposes of soft ring surface coverage can be improved sealing. This cover layer may be used to provide chemical resistance.
Using different tube wall thickness can be further controlled performance. Such as thin-walled flange can be used to load small circle requirements, but at the same time, the nominal pressure which would limit the circle around 420bar, depending on the actual cross-section diameter and wall thickness may be. In addition certain metals (notably aluminum) suited for thin-walled tube circle. Similarly, high pressure plastic seals, thick-walled tube can be used to do laps at the expense of the needs of the larger flange load. This is much higher than can be adapted to the pressure of 420bar. However, ventilation rings are usually made of more than 70bar pressure to seal the thick circle. Some typical production specifications are shown in Table 1.
All metals from low carbon steel, copper, aluminum to stainless steel, nickel, Monel and alloys, Inconel and tantalum. Common plating cadmium, copper, nickel, silver, gold, and indium. PTFE can be used for corrosion-resistant covering occasions, but this time laps
Operating temperature must be low.
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