| 摘要 |
A non-contacting face seal assembly for a shaft rotating at high speed with an improved secondary seal for low axial drag force. The secondary seal comprises an O-ring with a compliant spring element at its outer circumference. The compliant spring provides a controlled radial force, which keeps the secondary seal in a more reliable sealing contact with the seal ring and the seal housing surface but avoids excessive radial forces so that low axial drag forces due to secondary seal displacements are generated to prevent sealing face hang-up.
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