Patent ID: 7891670
Filing Date: 2011-02-22
Classification: F16J

Abstract:
1. A bi-directional, dynamic seal comprising: a lubricant side; a non-lubricant side; a sealing portion having an active surface communicating with said non-lubricant side and operable to engage with a shaft; a plurality of pumping elements extending along said active surface, said pumping elements operable to capture lubricant and pump said captured lubricant to at least one of said lubricant side and said non-lubricant side due to relative rotation between said shaft and said pumping elements; and a valve portion displaceable relative to said active surface and operable to engage said shaft, wherein rotation of said shaft rotationally displaces said valve portion relative to said active surface such that said displaced valve portion changes a pumping rate of at least one of said pumping elements.