How much rotation is transferred to the components connected by a “VCR type”* metal face seal fitting as it is tightened with a nickel gasket?
This data below shows that the relative rotation of the components ranges from 6.7 to 18.2 degrees. This rotation is based on the plating inside the female nut and the machined finishes of the contact surfaces of the glands and nuts.
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In the Omnisafe fitting the nuts rotate against the torque eliminators. The torque eliminators are locked together preventing any differential torque transfer to the glands. The torque eliminators allow only compression to be transferred to the glands.
* “VCR” is a trademark of the Swagelok Corporation