Process fluid actuated pilot operated control valve

摘要

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.

主权项

1. 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; anda piston coupled to the main valve plug; and a displacement measurement component coupled to the piston that measures displacement of the piston.