Valves and valve actuation – With means to increase head and seat contact pressure – Gate valve
Reexamination Certificate
2007-12-11
2007-12-11
Huson, Gregory (Department: 3753)
Valves and valve actuation
With means to increase head and seat contact pressure
Gate valve
C141S192000, C251S231000, C251S326000
Reexamination Certificate
active
11136776
ABSTRACT:
A controlled rate feeder system for fine particle solids and a method thereof includes a seat-and-backseat structure, a seat plate assembly, a backseat plate assembly, at least one biasing device, and an actuator assembly. The seat-and-backseat structure has an inlet and an outlet which are connected together by at least one passage. The seat plate assembly is moveable to any position between covering and exposing the inlet. The backseat plate assembly is positioned adjacent to and moveable with the seat plate assembly. At least one biasing device is positioned between the seat plate assembly and the backseat plate assembly which biases the seat plate assembly and the backseat assembly apart. The biasing device also biases the seat plate assembly against an inner surface of the seat-and-backseat structure and the backseat plate assembly against another inner surface of the seat-and-backseat structure. The actuator assembly moves the seat plate assembly to any position between covering and exposing the inlet.
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Huson Gregory
Nixon & Peabody LLP
Progress Materials Inc.
Rost Andrew J
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