High-precision gas medium regulating valve selection calculation method

A gas medium and calculation method technology, applied in calculation, special data processing applications, instruments, etc., can solve the problem of incorrect selection of the flow coefficient calculation formula, failure to consider the pressure difference ratio coefficient of the gas medium regulating valve, and inability to accurately determine the medium flow State and other issues

Inactive Publication Date: 2016-06-01
JIANGSU SHENTONG VALVE
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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
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  • High-precision gas medium regulating valve selection calculation method
  • High-precision gas medium regulating valve selection calculation method
  • High-precision gas medium regulating valve selection calculation method

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[0048] A high-precision calculation method for the selection of a gas medium regulating valve, which is characterized by the following steps:

[0049] S1: According to the selected valve type, get the rated flow coefficient of the valve and set it to C Vi-1 , Select its rated gas pressure difference ratio coefficient X T .

[0050] S2: Calculate the gas specific heat ratio coefficient F and expansion coefficient Y according to the formula

[0051] F γ = γ 1.40

[0052] When x T , When the gas medium is in a state of non-blocking flow,

[0053] Y = 1 - x 3 F γ x T

[0054] When x> FX T , When the gas medium is in a blocked flow state,

[0055] Y = 0.667

[0056] S3: Determine whether the size of the selected valve is consistent with the size of the connected pipeline;

[0057] If the size of the valve obtained in step S3 is consistent with the size of the connected pipe, then step S5 is entered;

[0058] S5: According to the formula x T To det...

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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...

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Application Information

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IPC IPC(8): G06F19/00
CPCG16Z99/00
Inventor 陈林葛黎明陆赛浩
Owner JIANGSU SHENTONG VALVE
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