Method and air-operated valve for determining wear condition of valve through pressure sensing

A pressure and valve technology, applied in the field of moving and/or stopping, which can solve problems such as equipment or vehicle failure, reduce measurement errors and eliminate adverse effects
CN101749296AInactive Publication Date: 2010-06-23ABB TECH AG
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
ABB TECH AG
Publication Date
2010-06-23
Estimated Expiration
Not applicable · inactive patent

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Abstract

The present invention provides a method for determining, through pressure sensing, the working condition of a valve device for controlling and treating a medium flow and a valve device, wherein a control pressure is applied to moving a valve unit (4) which is movably arranged in a valve shell (2) in axial direction, the control pressure applied in the activated and / or inactivated state of the valve unit (4) is measured to determine a static friction; after the valve unit (4) is stopped, a plurality of measurements are performed to determine a pressure increment (delta p) of the control pressure needed by the movement of the valve unit (4); then, the measured pressure increment (delta p)n is temporarily stored in a storage unit (18) and accessed by a diagnosis unit (17) so as to determine, through a statistic analysis, the possible influence on the movement of the valve unit (4) caused by a static friction.
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Description

technical field

[0001] The invention relates to a method for diagnosing the operating state of a valve device, in particular a pneumatic adjustment drive, for controlling a process medium flow by means of pressure sensing, in which method a valve which is arranged axially displaceable in a valve housing The unit is moved by applying a control pressure, wherein in order to determine the static friction force, the control pressure of the start and / or stop phases of the valve unit is measured. In addition, the invention also relates to a valve device having electronic means for implementing the above-described method. Background technique

[0002] The concept "position adjuster" as used in this disclosure supports an electromechanical system that controls an auxiliary energy source of a pneumatic adjustment drive in accordance with one or more input signals in order to bring the valve unit into a specific position. To function, positioning regulation requires gas under pressur...

Claims

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