A three-point adjustment method for regulating valve with electric valve positioner

Abstract

The invention belongs to the technical field of chemical energy instruments, and specifically provides a three-point adjustment method for a regulating valve with an electric valve positioner, which connects the regulating valve to be calibrated with a signal generator; in the regulating valve to be calibrated, an input signal m 1 , record the corresponding valve position display value n 1 ;input signal m 2 , record m 2 Corresponding valve position display value n 2 ; compute n 2 and n 1 the difference, compare the difference with 50% of the total stroke; adjust the range knob according to the comparison result until the difference is equal to 50% of the total stroke; input signal m 3 , adjust the valve position display value to 50% of the total stroke position through the zero adjustment knob, and the adjustment is completed; it solves the cumbersome adjustment process of the five-point method, the adjustment time is long, the error in the starting point confirmation process is large, and the maximum defect zero point is difficult If it is accurate, the operator cannot understand the essence and principle of the adjustment. The invention realizes three-point adjustment, the adjustment process is simple, the principle is clear at a glance, the efficiency is high, the accuracy rate is high, and there is no error, and the operator can easily grasp and understand the adjustment. School principles.

Description

technical field [0001] The invention belongs to the technical field of chemical energy instruments, in particular 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 regulating valve with electric valve positioner commonly used in the chemical energy instrument industry can be called "five-point method". That is, input 4mA, 8mA, 12mA, 16mA, 20mA five control signals, each input control signal is compared with the theoretical corresponding value of the actuator stroke card: 0, 25%, 50%, 75%, 100%, and then observe each Each input signal corresponds to the indication value of the actuator travel plate, so as to judge the size of the range. Repeat this process to adjust the range knob until the range is calibrated, and each adjustment requires a zero-adjustment operation. Finally, input a 4mA control signal, and adjust the zero-adjustment knob so that the pointer of th...

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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 adjustment takes a long time, and the starting point (ie zero point) confirmation process error Large, the zero point of the largest defect is difficult to find, and the operator cannot understand the essence and principle of the adjustment

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