Glossary V

Value, ‘R’:
See Position, Spring.

Variation, Contact Line Height:
The difference in the contact line height as measured at any two points on the contact line. Maximum contact line height variation is defined as seal slant.

Variation, Radial Wall:
The difference between the minimum and maximum radial wall dimensions when measured around 360 degrees of the lip seal.

Vibration, Torsional:
A vibration which has a circumferential angular direction. It is often generated by a stick-slip action between mating seal faces.

Volume Swell:
Increase in physical size caused by the swelling action of a liquid, generally expressed as a percent of the original volume.

Vulcanization:
An irreversible process during which a rubber compound, through a change in its chemical structure, becomes less plastic and more resistant to swelling by organic liquids and the elastic properties are confined, improved, or extended over a greater range of temperature.