The function of a v ring seal, or v ring, is to snap over a rotating shaft and act as a centrifugal seal acting against the bearing face and throwing dirt and contaminants away from the bearing area, which will probably contain the primary sealing elements. V seals are not designed to seal against fluids or pressure differentials in their own right. A v ring’s prime function is to exclude contaminants.
V rings are flexible rubber seals that work by stretching and fitting onto a shaft and then rotate with the shaft against a counter face. V ring seals are designed to give the lips an automatic sealing action. V seals provide secondary sealing as pressure acting on the header ring spreads the v rings, thereby increasing the sealing area.