Fluid handling – With leakage or drip collecting
Reexamination Certificate
2011-07-05
2011-07-05
Lee, Kevin L (Department: 3753)
Fluid handling
With leakage or drip collecting
C137S637200, C137S637400
Reexamination Certificate
active
07971600
ABSTRACT:
A throttling valve assembly has an outer housing that is sealed. An actuator is connected to a pressure balanced shaft that extends into the housing to operate a plurality of linkages that can rotate blades in tandem. With the surrounding housing sealed, the shaft penetrations of the blade support shafts no longer need seals or a purge system to supply process gas during times of reduced pressure in situations with the blades nearly closed. A pressure equalization system has balance passages internal to the housing to allow flow from higher pressure zones to lower pressure zone of the process gas so as to avoid creation of a condition that can draw air into any zones of reduced pressure in the housing.
REFERENCES:
patent: 4545742 (1985-10-01), Schaefer
patent: 4662190 (1987-05-01), Tischer
patent: 4972867 (1990-11-01), Ruesch
patent: 5345812 (1994-09-01), Haboian
patent: 6244289 (2001-06-01), Hopfe et al.
patent: 6397892 (2002-06-01), Pyle et al.
patent: 6425283 (2002-07-01), Muller
patent: 6453658 (2002-09-01), Willis et al.
Gerber Thomas E.
Sabin Mark R.
Cameron International Corporation
Fletcher Yoder
Lee Kevin L
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