Three-point adjustment method for adjusting valve with electric valve positioner

A technology of valve positioner and regulating valve, which is applied in the direction of valve details, valve operation/release device, valve device, etc. It can solve the problems of long time-consuming adjustment, difficulty in finding the zero point, and large error in the confirmation process of starting point, etc., to achieve High accuracy, simple adjustment process and high efficiency

Active Publication Date: 2021-02-26
SHAANXI YANCHANG PETROLEUM GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the three-point adjustment method of a regulating valve with an electric valve positioner provided by the present invention is to overcome the cumbersome adjustment process of the five-point method in the prior art, the

Method used

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  • Three-point adjustment method for adjusting valve with electric valve positioner

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] like figure 1 As shown, a three-point adjustment method for a regulating valve with an electric valve positioner includes the following steps:

[0023] 1) Connect the regulating valve to be calibrated to the signal generator;

[0024] 2) In the regulating valve to be calibrated, input the control signal m 1 , record the control signal m 1 Corresponding valve position display value n 1 ;

[0025] 3) In the regulating valve to be calibrated, input the control signal m 2 , record the control signal m 2 Corresponding valve position display value n 2 ;

[0026] 4) Calculate n 2 and n 1 Compare the difference with 50% of the total stroke of the calibrated regulating valve; adjust the range knob according to the comparison result until the difference is equal to 50% of the total stroke of the calibrated regulating valve;

[0027] 5) Input control signal m 3 , adjust the valve position display value to the position of 50% of the total stroke of the calibrated regulat...

Embodiment 2

[0030] On the basis of Example 1, further, the control signal m 1 The range is: 4mA≤m 1 ≤12mA. Limit control signal m 1 range, the purpose is for the next calibration point, that is, the control signal m 2 The value of , the range design is reasonable.

[0031] Further, the control signal m 2 for m 1 +8. The reason m 2 value m 1 +8 is because the general output signal range is 4mA-20mA, that is, the total output signal range is (20-4)mA, that is, 16mA, the purpose is to achieve m 2 -m 1 / 16 is 50% of the total range of the output signal, and finally realize the one-to-one correspondence between the interval value of the two output signals and the difference between the two indications corresponding to the stroke indicator of the regulating valve actuator and the total stroke of the actuator.

[0032] Further, the step 2) input control signal m 1 , when the valve position display value n 1 When it is greater than 50% of the total stroke of the regulating valve to be...

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Abstract

The invention belongs to the technical field of chemical energy instruments, and particularly provides a three-point adjustment method for an adjusting valve with an electric valve positioner. The method comprises the following steps of connecting an adjusted adjusting valve with a signal generator; inputting a signal m1 into the adjusted adjusting valve, and recording a corresponding valve position display value n1; inputting a signal m2, and recording a valve position display value n2 corresponding to m2; calculating a difference value between n2 and n1, and comparing the difference value with 50% of a total stroke; adjusting a range knob according to a comparison result until the difference value is equal to 50% of the total stroke; and inputting a signal m3, adjusting the valve position display value to a position which is 50% of the total stroke through a zero setting knob, and finishing adjustment. The problems of complex adjustment process, long adjustment time, large error in astarting point confirmation process, difficulty in finding a maximum defect zero point and incapability of mastering the essence and principle of adjustment by an operator in a five-point method aresolved; and three-point adjustment is realized, the adjustment process is simple, the principle is fairly self-explanatory, the efficiency is high, the accuracy is high, errors are avoided, and the operator can easily master and understand the adjustment principle.

Description

technical field [0001] The invention belongs to the technical field of chemical energy instruments, and in particular relates to a three-point adjustment method of a regulating valve with an electric valve positioner. Background technique [0002] At this stage, the adjustment method of the regulating valve with electric valve positioner commonly used in the chemical energy instrument industry can be called the "five-point method". That is, input five control signals of 4mA, 8mA, 12mA, 16mA, and 20mA, and compare each input control signal with the theoretical corresponding value of the travel plate of the actuator: 0, 25%, 50%, 75%, and 100%, and then observe each One input signal corresponds to the indication value of the actuator travel plate, so as to judge the size of the measuring range. Repeat this process to adjust the range knob until the range adjustment is calibrated, and a zero adjustment operation is required for each adjustment, and finally input a 4mA control ...

Claims

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Application Information

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IPC IPC(8): F16K31/02F16K37/00
CPCF16K31/02F16K37/0041
Inventor 李瑞吴红梅井争平
Owner SHAANXI YANCHANG PETROLEUM GRP
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