Patent ID: 6347800
Filing Date: 2002-02-19
Classification: F16J

Abstract:
A non-contact shaft seal comprising;sealing element mounted coaxially to a rotary sealing ring to form a primary seal between opposed faces thereof to substantially prevent fluid flow across the primary seal from a high-pressure radial side to a low-pressure radial side, the sealing element being urged axially towards the rotary ring by a biasing means acting between an L-shaped pusher sleeve connected to the sealing element; and a seal housing with a secondary seal formed between the seal housing and the pusher sleeve by a sealing member wherein the sealing member is in a channel in whichever of the seal housing and the pusher sleeve is located on the low pressure radial sides wherein juxtaposed faces of the seal housing and the pusher sleeve are located substantially axially aligned with an equilibrium balance diameter of the primary seal.