The KOK V-Packings are precision moulded from a variety of fabric and rubber combinations for many service conditions. They are usually supplied in complete sets consisting of a male and female adaptor ring with a number of V-section pressure rings to make up the required depth. The lips of the pressure rings are designed with an interference fit to seal at low pressure and to respond automatically as pressure increases. Seal efficiency and life depend largely on the support given by the adaptors, particularly the female adaptor. For normal use, the female adaptors are usually made in the same material as the pressure rings. For heavy duty usage, or where there is an inadequate bearing surface, hard adaptors made with special grades of fabric are supplied. For very high pressures or conditions where severe shock loads are likely to be encountered, KOK seals both for glands and pistons, are supplied with polyacetal anti-extrusion rings built into the female adaptors. KOK V-Packings can be used with mineral oils, water soluble oils and water glycol fluids in the temperature range of -30 degrees Celsius to 110 degrees Celsius at pressures up to 5000lbf/inch squared.
