| US 7,484,710 B2 | ||
| Fluid flow control valve with high temperature bi-directional shutoff | ||
| David John Koester, Gladbrook, Iowa (US); Sarah Lynn Dvorak, Ames, Iowa (US); Lynn Dean Mahncke, Marshalltown, Iowa (US); Brandon Wayne Bell, Marshalltown, Iowa (US); and Ronald R. Brestel, Marshalltown, Iowa (US) | ||
| Assigned to Fisher Controls International LLC, St. Louis, Mo. (US) | ||
| Filed on Feb. 28, 2005, as Appl. No. 11/68,946. | ||
| Application 11/068946 is a continuation in part of application No. 10/101139, filed on Mar. 19, 2002, granted, now 6,974,121. | ||
| Prior Publication US 2005/0211942 A1, Sep. 29, 2005 | ||
| Int. Cl. F16K 5/08 (2006.01) | ||
| U.S. Cl. 251—160 [251/172; 251/192; 251/298; 251/315.07] | 19 Claims |
| 1. A valve comprising:
a valve housing having an inlet and an outlet and a fluid flowpath connecting the inlet and the outlet;
a ball element pivotably mounted in the valve housing;
a main seal disposed within the fluid flowpath and biased toward the ball element;
a seal housing disposed between the main seal and the valve housing, the main seal being movable relative to the seal housing;
and
a bellows disposed between the main seal and the seal housing, the bellows preventing fluid flow between the main seal and
the seal housing,
the seal housing including a pair of stops positioned to span a ledge carried by the main seal and arranged to limit movement
of the main seal toward and away from the ball element.
|