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A Wills Ring or Cooper Ring is a form of all-metallic O-ring seal. They are used for extremely arduous service, such as sealing the head gasket of high performance piston engines. Hollow, metallic Wills Rings are used as they have better springback than yielding soft metal seals and higher temperature limits than elastomer O rings.
An example are FKM o-rings used as an upgrade to the original neoprene seals on Corvair pushrod tubes that deteriorated under the high heat produced by the engine, allowing oil leakage. FKM tubing or lined hoses are commonly recommended in automotive and other transportation fuel applications when high concentrations of biodiesel are required.
O-ring materials may be subjected to high or low temperatures, chemical attack, vibration, abrasion, and movement. Elastomers are selected according to the situation. There are O-ring materials which can tolerate temperatures as low as −330 °F (−200 °C) or as high as 480 °F (250 °C).
A taper-joint stopper with PTFE Sealing Ring. Optical transparency of the narrow sealing ring pressured by glass joint (right). Glass taper joints can be sealed hermetically with PTFE sealing rings (high vacuum tight, air leakage rate 10 −6 mBar × L/sec and below), [ 6 ] o-rings (optionally encapsulated o-rings), or PTFE sleeves, [ 7 ...
Titanium and its alloys are used in airplanes, missiles, and rockets where strength, low weight, and resistance to high temperatures are important. [ 14 ] [ 15 ] [ 16 ] Since titanium does not react within the human body, it and its alloys are used in artificial joints, screws, and plates for fractures, and for other biological implants.
An obturating ring is a ring of relatively soft material designed to obturate under pressure to form a seal. Obturating rings are often found in artillery and other ballistics applications, and similar devices are also used in other applications such as plumbing , like the olive in a compression fitting .
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