Valves and valve actuation – Mechanical movement actuator – Particularly packed or sealed
Reexamination Certificate
2011-07-19
2011-07-19
Hepperle, Stephen M (Department: 3753)
Valves and valve actuation
Mechanical movement actuator
Particularly packed or sealed
C137S315280, C277S500000, C277S520000
Reexamination Certificate
active
07980530
ABSTRACT:
A packing nut assembly for a control valve having a valve body and a valve stem includes a packing box arranged for operative coupling to the valve body and having a primary bore sized to receive the valve stem and first and second counterbores. The first counterbore is sized to receive valve packing and the second counterbore includes internal threads. A packing nut having a central bore is sized to receive the valve stem and includes a threaded outer surface positioned to engage the second counterbore of the packing box. The packing nut includes an adjustment surface positioned to face the first counterbore, and includes an adjustment head having a plurality of tool-receiving apertures sized to receive an adjustment tool.
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International Search Report received in International (PCT) Application PCT/US2006/030627, by the European Patent Office, dated Nov. 24, 2006.
Written Opinion for Application PCT/US2006/030627 by the European Patent Office, dated Nov. 24, 2006.
Kinser Andrew
Koester David John
Mahncke Lynn Dean
Olberding Jason Gene
Chaudry Atif H
Fisher Controls International LLC
Hepperle Stephen M
Marshall & Gerstein & Borun LLP
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