Fluid handling – Pressure modulating relays or followers
Reexamination Certificate
2007-09-11
2007-09-11
Krishnamurthy, Ramesh (Department: 3753)
Fluid handling
Pressure modulating relays or followers
C137S084000, C073S001570, C073S001650, C251S335300, C092S039000
Reexamination Certificate
active
11088716
ABSTRACT:
A deadweight pressure standard provides improved measurement accuracy and repeatability. The standard includes a flow regulator having a first valve controlled by a first pair of non-hysteresis sylphons, and a supply regulator having a second valve controlled by a second pair of non-hysteresis sylphons. The first and second valves achieve an equilibrium state between the supply regulator and the flow regulator. The second valve regulates pressure generated by an applied pressure supply. A mass-to-pressure transducer transforms an applied gravitational force into a reference pressure regulated by the first valve. The center of pressure force on the first pair of non-hysteresis sylphons, and the center of pressure force on the first valve, are exerted along a first reference axis. The center of pressure force on the second pair of non-hysteresis sylphons, and the center of pressure force on the second valve, are exerted along a second reference axis.
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Krishnamurthy Ramesh
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