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

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 ...

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 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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