Patent ID: 6386548
Filing Date: 2002-05-14
Classification: F16J

Abstract:
A dual seal for providing a seal between a rod and a gland, the rod extending along a longitudinal axis, the dual seal comprising:a first annular seal element constructed of a material having a first hardness and having a seal edge contacting the rod to provide a seal between the first seal element and the rod and a radially opposed second seal edge, said first and second seal edges being separated by a groove formed in a radially extending surface of the seal element, wherein the groove extends axially to a depth D and the first seal edge has an axial length C, whereby the relationship between the groove depth D and the axial length C of the first seal edge is (Câˆ’D)/D&lE;0.25, and a second annular seal element positioned axially adjacent the first annular seal element, the second annular seal element being constructed of a material having a second hardness different from the first hardness and having a seal edge contacting the rod to provide a seal between the second seal element and the rod, wherein at least a portion of one of the first annular seal element and the second annular seal element engages the gland to form the seal between the rod and the gland.