High-precision gas medium regulating valve selection calculation method

Abstract

The invention discloses a high-precision gas medium regulating valve selection calculation method, which comprises the following steps of after obtaining an initial flow coefficient through selecting a differential pressure ratio coefficient when a valve is fully opened, considering the characteristic of the differential pressure ratio coefficient changing along the valve opening, repetitively iterative calculating, and finally obtaining an accurate flow coefficient of the valve under a given operation condition. According to the high-precision gas medium regulating valve selection calculation method provided by the invention, a calculating process is improved based on a gas medium flow coefficient calculation part in ANSI / ISA-75.01.01(IEC60534-2-1 Mod)-2007, the corresponding differential pressure ratio coefficient is selected according to the change of the valve opening, and the flow coefficient is iteratively operated, so that the selection calculation result of the gas medium regulating valve is more accurate, and the actual use requirement is met.

Description

technical field [0001] The invention relates to a calculation method for type selection of a gas medium regulating valve. Background technique [0002] In the pipeline system of process control, the control valve is often used to adjust the flow, pressure, temperature and other process parameters of the system. The selection process of the control valve refers to the selection of the appropriate type and size of the control valve according to the pressure, flow, type, temperature and other parameters of the medium flowing through the pipeline. [0003] The selection calculation of the control valve is a key step in the design of the process control system. Improper selection of the control valve will cause the process control system to fail to adjust the process parameters correctly, shorten the service life of the control valve, and even cause safety production accidents in severe cases. [0004] At present, the type selection calculation of the gas medium control valve is...

AI Technical Summary

Problems solved by technology

However, since the calculation method provided by this standard does not take into account the characteristics of the pressure difference ratio coefficient of the gas medium regulating valve changing with the valve opening, the pressure difference ratio when the valve is fully open is selected for the calculation process of the valve at any opening. coefficient

For some valves whose differential pressure ratio coefficient changes greatly with the opening of the valve, this method will not be able to accurately determine the flow state of the medium, and thus cannot correctly select the corresponding flow coefficient calculation formula, which will eventually lead to the selection calculation results not in line with reality Requirements

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