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Method for determining a fluid flow rate with a fluid control valve

A valve and flow technology, applied in one field of one, can solve the problems of the influence of the measurement accuracy of the flowmeter, the increase in maintenance costs, and the difficulty of installing the flowmeter, so as to achieve low cost, reduced operating costs, operating efficiency and reliability. improved effect

Inactive Publication Date: 2013-09-18
冯经娟
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  • Abstract
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AI Technical Summary

Problems solved by technology

Since the regulating valve and the flow meter are installed in the pipeline at the same time, the cost of installation, commissioning and daily operation and maintenance also increases
[0005]2. Strict requirements on the length of the upstream and downstream straight pipe sections of the flowmeter
This brings certain difficulties to the installation of the flowmeter
When the length requirements of the straight pipe section cannot be met, the measurement accuracy of the flowmeter will be affected
[0007]3. Introducing additional resistance in the piping system
Since the working flow characteristics are related to the actual installation conditions of the valve, this method cannot be used in conjunction with the manufacture of the valve to manufacture a valve that can simultaneously perform flow regulation and flow measurement.
This is also the reason why the valve characteristics are not used for flow measurement in the currently disclosed patented technology

Method used

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  • Method for determining a fluid flow rate with a fluid control valve
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  • Method for determining a fluid flow rate with a fluid control valve

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Embodiment approach

[0059] The preferred implementation method of the novel regulating valve measuring flow comprises the following steps:

[0060] 1) Provide the above-mentioned new type of regulating valve, including valve body, actuator, controller and differential pressure sensor; the controller is a chip set, including circuit board, microprocessor, memory, input and output modules and auxiliary components connected element;

[0061] 2) Provide the flow characteristic curve of the valve body, the flow characteristic curve refers to the relationship between the relative flow and the relative opening under the condition of keeping the pressure difference between the two ends of the valve constant;

[0062] 3) Provide the flow coefficient of the valve body, which is a physical quantity to measure the flow control capability of the valve;

[0063] 4) Provide the adjustable ratio of the valve body, the adjustable ratio is the ratio of the maximum flow to the minimum flow that the valve can contr...

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Abstract

A method for determining a fluid flow rate with a fluid control valve utilizes inherent characteristics of a particular valve in conjunction with easily measured parameters in order to determine a flow rate through the valve. A valve flow characteristic equation, a flow coefficient, and a rangeability for the valve are known and hardcoded into a chipset that controls the valve. A differential pressure transducer measures the pressure drop across the valve. A valve actuator controls the valve opening fraction. The differential pressure transducer and the valve actuator provide feedback signals to the chipset. The known and measured parameters are used to calculate an instantaneous valve characteristic and a fully-open flow rate for the valve. The instantaneous flow rate through the valve is then calculated from the instantaneous valve characteristic and the fully-open flow rate.

Description

technical field [0001] The invention relates to a flow measurement method based on valve characteristics and its application. More specifically, the invention is a method and a device for calculating the flow rate, which can be used to create a new type of regulating valve or to retrofit a valve already installed in a pipeline. Background technique [0002] In many industrial fields, such as petroleum, mining, electric power, water supply and drainage and HVAC, regulating valves are widely used to control the flow, pressure, temperature and liquid level of hydraulic systems in industrial processes. When the industrial process requires flow measurement as well as flow regulation, or requires high flow control, it is necessary to install both a regulating valve and a flow meter on the piping system. The liquid flowmeters commonly used in the industry include: differential pressure flowmeters, turbine flowmeters, electromagnetic flowmeters and ultrasonic flowmeters. The appli...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16K31/12G01F1/34
CPCG01F1/363G01F1/40G01F15/005Y10T137/0368G01F25/10G01F1/56
Inventor 冯经娟
Owner 冯经娟
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