Valves and valve actuation – Mechanical movement actuator – Particularly packed or sealed
Reexamination Certificate
2005-03-15
2005-03-15
Hirsch, Paul J. (Department: 3754)
Valves and valve actuation
Mechanical movement actuator
Particularly packed or sealed
C251S318000
Reexamination Certificate
active
06866244
ABSTRACT:
A fluid control valve, in which the usual metal stem guide bushings have been eliminated, includes a valve bonnet and a packing nut threadably engaging the valve bonnet. A valve stem passes through the valve bonnet and the packing nut in a clearance fit so that there is no engagement therebetween. A single packing set is included, having a middle virgin PTFE sealing ring, a carbon or glass filled PTFE male packing ring on one side and a carbon or glass filled PTFE female ring on the other side. Belleville disk springs may be provided intermediate the packing nut and the packing set, for supplying live loading to the packing. The packing provides sufficient stem guidance, interference fit with the valve stem to enable the usual upper and lower metal guide bushings to be eliminated.
REFERENCES:
patent: 1463169 (1923-07-01), Löwinger
patent: 3467357 (1969-09-01), Schomer et al.
patent: 3648718 (1972-03-01), Curran
patent: 3958592 (1976-05-01), Wells et al.
patent: 4379557 (1983-04-01), Saka
patent: 4570942 (1986-02-01), Diehl et al.
patent: 4792119 (1988-12-01), Illy et al.
patent: 5791629 (1998-08-01), Wears et al.
patent: 93 15 995.1 (1994-03-01), None
patent: 2 066 906 (1981-07-01), None
International Search Report in PCT/US04/00327 dated May 24, 2004.
Fisher Controls International LLC
Hirsch Paul J.
Marshall & Gerstein & Borun LLP
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