US 12,607,278 B2 · Using pressure to monitor position of components on a control valve

Abstract

A position monitoring system is configured for use on control valves and other flow controls. These configurations include a motion sensitive unit, for example, a flexible tube with one end that can move in conjunction with a valve stem on the flow control. The flexible tube may hold synthetic oil. Another end of the tube may couple with a pressure senor. In use, this senor may generate a signal that corresponds with head pressure of the synthetic oil in the tube. Operating hardware on the flow control, for example, processing hardware that is part of a valve positioner or controller, may process the signal from the pressure sensor to identify a operating condition of a valve, for example, a position for a closure member of the valve.

Claims20

Dependent claims

A control valve, comprising:

an actuator;
a valve stem coupled with the actuator;
a closure member coupled with the valve stem;
a position monitoring system coupled with the closure member, the position monitoring system configured to generate a signal in response to head pressure of a fluid, the signal corresponding with a position for the closure member;
wherein the position monitoring system comprises:
a tube that contains the fluid, the tube configured with a first end and a second end,
a cylinder coupled with the first end of the tube, the cylinder configured with a reservoir that contains the fluid and is configured to move concomitantly with the valve stem, and
a piston having an end disposed in the cylinder and in contact with the fluid, the piston configured to remain stationary relative to movement of the cylinder.

5 more elements

Dependencies are inferred from the claim text.

Using pressure to monitor position of components on a control valve

Life of this patent

Using pressure to monitor position of components on a control valve

Life of this patent

Abstract

Claims20