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Method for diagnosing the state of wear of a valve arrangement for controlling the flow of a process medium

A process medium, valve device technology, applied in the field of diagnosis of the wear state of the valve device used to control the process medium flow, can solve the problems of consumption, high sensing technology, etc.

Inactive Publication Date: 2010-06-23
ABB TECH AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] Disadvantages in such an electronic evaluation unit for diagnosing the operating state are the relatively high outlay on sensor technology, since different pressure sensors and additional sensors are required, and detailed information on the pneumatic system must be available in order to be able to Determining a malfunction in the system

Method used

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  • Method for diagnosing the state of wear of a valve arrangement for controlling the flow of a process medium
  • Method for diagnosing the state of wear of a valve arrangement for controlling the flow of a process medium
  • Method for diagnosing the state of wear of a valve arrangement for controlling the flow of a process medium

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Embodiment Construction

[0032] according to figure 1 , the valve housing 2 of the process valve is installed in the partially described line 1 of the process plant which is not further described. The valve housing has in its interior a closing body 4 interacting with a valve seat 3 for controlling the quantity of process medium 5 flowing through. The closing body 4 is linearly actuated by the pneumatic adjusting drive 10 via the lifting rod 7 . The pneumatic actuating drive 10 is connected via a choke 6 to the valve housing 2 of the process valve. A position regulator with a positioning adjustment device 13 is mounted on the yoke 6 . The travel of the lifting rod 7 is reported by the position sensor 12 in the region of the position controller. The detected travel is compared within the positioning adjustment device 13 with a predetermined setpoint value, and the pneumatic adjustment drive 10 is controlled in dependence on the ascertained adjustment deviation. The pneumatic actuating drive 10 incl...

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Abstract

A method and valve arrangement are provided for controlling the flow of a process medium through a pipeline (1). A pneumatic actuator (10) moves a valve element, which is accommodated in a valve housing (2), and switches the flow of the process medium (5), in accordance with a positioning control system (13) by means of a control piston, to at least one side of which control pressure is applied in a drive chamber (11). An electronic evaluation unit (15) connected to the positioning control system monitors the operating state. A pressure sensor (16) measures the pressure in the drive chamber (11), and the evaluation unit (15) analyzes the measured pressure value with respect to a pressure p and the pressure change dp(t) over time to determine the flow into / from the drive chamber (11) and / or the ratio (V / A) of the drive chamber volume to the effective opening cross section of the valve arrangement as a measure of the operating state of the valve arrangement.

Description

technical field [0001] The invention relates to a method for diagnosing the operating state of a valve device for controlling the flow of a process medium through a pipeline, the valve element of which is arranged in a valve housing and controls the flow of the process medium via a pneumatic The actuating drive is moved by a control piston in the drive chamber, to which a control pressure is applied at least on one side, according to the positioning of the actuating device, where the operating state is monitored by an electronic evaluation unit connected thereto. Furthermore, the invention also relates to a valve arrangement having an electronic evaluation unit for carrying out such a method. Background technique [0002] The term "position adjustment device" is used in this application to designate a mechatronic system that controls the auxiliary energy of a pneumatic adjustment drive as a function of one or more input signals in order to bring a valve element into a define...

Claims

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Application Information

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IPC IPC(8): F15B19/00G05D16/00
CPCF15B15/20F16K37/0041G05B23/0254Y10T137/8242
Inventor U·E·迈尔D·帕佩
Owner ABB TECH AG
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