Method for detecting an operating condition on a valve assembly and implementation thereof
First Claim
1. A method, comprising:
- receiving a control signal from a process control system;
using the control signal to identify a position for a closure member relative to a seat;
implementing a tight shutoff mode in response to the position below a threshold, the tight shutoff mode automatically forcing the closure member to a closed position in contact with the seat; and
indicating the tight shutoff mode by,receiving data from a data source, the data describing operating parameters that correspond with movement of the closure member;
comparing the data to two boundary values that are proximate, but larger than, the closed position and separated by a boundary interval; and
generating an output that reflects a pattern of movement for the closure member between the two boundary values that correlates with cycling of the closure member due to tight shutoff mode.
2 Assignments
0 Petitions
Accused Products
Abstract
A method to detect cycling of components that result from use of a tight shut-off mode on a valve assembly. Embodiments of the method use operating data from the valve assembly. This operating data includes data that reflects a position for the closure member relative to the seat. This position often corresponds with a measured position of one or more components (e.g., the valve stem) on the valve assembly. In one embodiment, the method includes steps for comparing the measured position to a boundary criteria that defines one or more boundary values proximate, and often equal to, the threshold levels of the tight shut-off mode. The method can also includes steps for identifying patterns in the data that indicate that the closure member is cycling from its closed position to a second position due to tight shut-off mode.
10 Citations
20 Claims
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1. A method, comprising:
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receiving a control signal from a process control system; using the control signal to identify a position for a closure member relative to a seat; implementing a tight shutoff mode in response to the position below a threshold, the tight shutoff mode automatically forcing the closure member to a closed position in contact with the seat; and indicating the tight shutoff mode by, receiving data from a data source, the data describing operating parameters that correspond with movement of the closure member; comparing the data to two boundary values that are proximate, but larger than, the closed position and separated by a boundary interval; and generating an output that reflects a pattern of movement for the closure member between the two boundary values that correlates with cycling of the closure member due to tight shutoff mode. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A valve assembly, comprising:
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an actuator; a valve stem coupled with the actuator; a valve coupled with the valve stem, the valve comprising a closure member and a seat, wherein the closure member is configured to move relative to the seat; and a valve positioner coupled with the valve assembly, the valve positioner comprising a processor with access to a memory that has one or more executable instructions stored thereon, the executable instructions comprising one or more instructions for, receiving a control signal from a process control system; using the control signal to identify a position for the closure member relative to the seat; implementing a tight shutoff mode in response to the position below a threshold, the tight shutoff mode automatically forcing the closure member to a closed position in contact with the seat; and indicating the tight shutoff mode by, receiving data from a data source, the data describing operating parameters that correspond with movement of the closure member; comparing the data to two boundary values that are proximate, but larger than, the closed position and separated by a boundary interval; and generating an output that reflects a pattern of movement for the closure member between the two boundary values that correlates with cycling of the closure member due to tight shutoff mode. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. A valve positioner, comprising:
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a processor; a memory coupled with the processor; and one or more executable instructions stored in the memory and configured to be executed by the processor, the executable instruction comprising one or more instruction for, receiving a control signal from a process control system; using the control signal to identify a position for a closure member relative to a seat; implementing a tight shutoff mode in response to the position below a threshold, the tight shutoff mode automatically forcing the closure member to a closed position in contact with the seat; and indicating the tight shutoff mode by, receiving data from a data source, the data describing movement of the closure member; comparing the data to two boundary values that are proximate, but larger than, the closed position and separated by a boundary interval; and generating an output that reflects a pattern of movement for the closure member between the two boundary values that correlates with cycling of the closure member due to tight shutoff mode. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification