Process fluid actuated pilot operated control valve
AssigneeDresser, Inc.
InventorsHenry William Boger, James Albert Stares
Life of this patent
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Abstract
A flow control system includes a pilot driven valve having a pilot assembly and a main valve assembly; a displacement measurement component coupled to the main valve assembly indicating displacement of the main valve assembly; and a proportional solenoid responsive to a signal from the displacement measurement component that displaces the pilot assembly in proportion to the changes in displacement of the main valve assembly. The valve is controlled by sensing a displacement of the main valve assembly; and modulating the proportional solenoid in response to the displacement of the main valve assembly.
Claims6
A valve comprising:
- a housing having an upstream port and a downstream port;
- a pilot assembly coupled to the upstream port;
- a plunger adapted to engage and displace the pilot assembly;
- a proportional solenoid electromagnetically coupled to the plunger;
- a main valve fluidly coupled to the pilot assembly, the main valve comprising,
- a main valve plug;
- and
- a piston coupled to the main valve plug;
- and
- a displacement measurement component coupled to the piston that measures displacement of the piston.
Dependencies are inferred from the claim text.