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Safety override circuit for pneumatic positioner and method of use thereof

A positioner and control circuit technology, applied in the direction of fluid pressure actuation system safety, servo meter circuit, physical quantity changer, etc., can solve problems such as temperature or pressure exceeding the safe working limit

Active Publication Date: 2012-06-20
DRESSER IND INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

During work, unsafe working conditions may arise, such as temperature or pressure exceeding safe working limits

Method used

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  • Safety override circuit for pneumatic positioner and method of use thereof
  • Safety override circuit for pneumatic positioner and method of use thereof
  • Safety override circuit for pneumatic positioner and method of use thereof

Examples

Experimental program
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Embodiment Construction

[0019] figure 1 An example implementation of a pneumatic positioner 100 including a safety override circuit 200 is shown. In this implementation manner, the safety override circuit 200 restores the output pressure of the electric-pressure (E / P) converter 102 to atmospheric pressure according to the starting condition. The pneumatic positioner 100 is controlled by an input signal 106, which in turn is used to power the control circuit 108 of the E / P converter 102. In certain implementations, the input signal 106 may be used to transmit other information to the pneumatic positioner 100. Generally, the control circuit 108 causes the E / P converter 102 to generate a pressure at its output port 110, and the pressure is used to manipulate the equipment under control (EUC) 112. If an unsafe condition is detected during operation, the safety override circuit 200 interrupts the control signal 115 for the E / P converter 102, while still allowing the input signal 106 to continue to the con...

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PUM

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Abstract

Systems and processes may provide improved performance for a pneumatic positioner during a safety override. In certain implementations, a system and process may include may include the ability to receive an input control signal, power control circuitry of the pneumatic positioner using the input control signal, and generate a control signal for a signal-to-pressure converter with the control circuitry based at least partially on the input control signal. The system and process may also include the ability to detect an unsafe operating condition for the pneumatic positioner based on an input signal and modify the control signal in response to detecting the unsafe operating condition, to cause the converter to transition to a safe state. The system and process may additionally include the ability to allow the control circuitry to continue being powered by the input control signal while the converter is in the safe state.

Description

Technical field [0001] This article relates generally to pneumatic equipment, and in particular to pneumatic positioners. Background technique [0002] Pneumatic equipment is widely used in various commercial and industrial settings. Because their applications are constantly changing, pneumatic equipment often works in various situations, and their working conditions are critical for safety and / or system operation reasons. Common pneumatic equipment includes wrenches, elevators and positioners. [0003] Pneumatic positioners can be used in various equipment, including pneumatic valves, air flow equipment, etc. During work, unsafe working conditions may occur, such as temperature or pressure exceeding safe working limits. In this case, it may be desirable to turn off the positioner, which usually involves transitioning the pneumatic positioner to a safe state and removing electrical power from the electronic components. Changing the pneumatic positioner to a safe state can be ac...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F15B20/00F15B9/09
CPCF15B20/00F15B2211/8755F15B19/005F15B5/006Y10T137/7761Y10T137/0318Y10T137/2278Y10T137/7762
Inventor M·V·切斯特P·S·莱弗斯克A·J·莱格力
Owner DRESSER IND INC