| US 7,478,816 B2 | ||
| Seal stiffener | ||
| Jason G. Olberding, Marshalltown, Iowa (US); and Douglas J. Boyd, Marshalltown, Iowa (US) | ||
| Assigned to Fisher Controls International, LLC, Saint Louis, Mo. (US) | ||
| Filed on May 10, 2004, as Appl. No. 10/842,679. | ||
| Prior Publication US 2005/0248095 A1, Nov. 10, 2005 | ||
| Int. Cl. F16J 3/00 (2006.01) | ||
| U.S. Cl. 277—628 [277/644; 277/654; 251/173; 251/306] | 20 Claims |
| 1. A sealing apparatus comprising:
a first flexible member comprising a curved sealing portion having a concave surface and being configured to provide a first
stiffness in a first flow direction; and
a second flexible member disposed between a retainer and the concave surface of the first flexible member and configured to
provide a second stiffness of the first flexible member in a second flow direction, wherein the second flexible member does
not interfere with the first flexible member in the first flow direction.
|