Valves and valve actuation – With means to increase head and seat contact pressure – With positive reduction
Reexamination Certificate
2005-02-28
2009-02-03
Bastianelli, John (Department: 3753)
Valves and valve actuation
With means to increase head and seat contact pressure
With positive reduction
C251S172000, C251S192000, C251S298000, C251S315070
Reexamination Certificate
active
07484710
ABSTRACT:
A control valve of the ball type with bi-directional shutoff capabilities is disclosed. The ball valve including an inlet and an outlet, a ball element and a seal assembly. When closing the valve, the ball element, which is eccentrically mounted on a shaft, rotates to abut the seal assembly. While closed, the seal assembly including a seal housing, a main seal and a resilient member, contacts the ball element at the main seal, while the resilient member biases the main seal toward the ball element. The seal assembly further includes a secondary flowpath between the main seal and seal housing, which is restricted by a high temperature seal.
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Bell Brandon Wayne
Brestel Ronald R.
Dvorak Sarah Lynn
Koester David John
Mahncke Lynn Dean
Bastianelli John
Fisher Controls International LLC
Marshall & Gerstein & Borun LLP
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