Valves and valve actuation – Limit stop
Reexamination Certificate
2007-03-09
2010-06-29
Bastianelli, John (Department: 3753)
Valves and valve actuation
Limit stop
C251S337000
Reexamination Certificate
active
07744062
ABSTRACT:
Apparatus to vary the effective spring rate of diaphragm actuators are described. An example spring assembly for use in a diaphragm actuator includes a first spring operatively coupled to a diaphragm plate and an actuator stem, and a second spring operatively coupled to the actuator stem and configured to be serially operative with the first spring. Additionally, a movable spring seat is disposed between the first and second springs.
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Bastianelli John
Fisher Controls International LLC
Hanley Flight & Zimmerman LLC
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