Flow adjusting method of manual balance valve

Abstract

The invention relates to the technical field of balance valves, in particular to a flow adjusting method of a manual balance valve, which comprises the following specific steps: S1, prefabricating a flow opening differential pressure gauge; s2, a pressure difference measuring device is connected to the manual balance valve, and the pressure difference value of the front end and the rear end of the manual balance valve is obtained; s3, gradually increasing the valve opening of the manual regulating valve from small to large, and reading the real-time pressure difference value of the pressure difference measuring device; s4, searching a standard pressure difference value corresponding to the current opening in a flow opening pressure difference table, and comparing the standard pressure difference value with the actually measured pressure difference value; s5, the opening degree of the valve is adjusted and then compared with the actually-measured pressure difference value; when the actually-measured pressure difference value is consistent with the standard pressure difference value or is within the determined error range, the current opening degree is the valve opening degree needed for achieving the target flow; according to the method, measurement errors caused by scaling or rusting in the pipeline can be avoided, the measurement precision is improved, meanwhile, repeated numerical value input in the measurement process is avoided, and the convenience and accuracy of flow measurement in the manual balance valve are improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of balance valve, in particular to a flow regulation method of a manual balance valve. BACKGROUND

[0002] The manual balance valve is a valve with excellent regulation characteristics. The manual balance valve is applied in a heating system. In order to make the system flow reach the design flow, the adjustment and measurement after installation are indispensable important links. The waste of heat energy and electric energy caused by water imbalance in the heating system is great. Therefore, the adjustment of the manual balance valve is particularly important. After adjustment, the water balance of the heating system can reduce the waste of heat energy and electric energy of the heating enterprise and improve the heating capacity of the heating enterprise. Although the self-operated flow control valve in the dynamic balance valve is very convenient to use in flow regulation, it does not support variable flow operation condition. However, many water pumps are operated at variable frequency in actual working conditions. Therefore, the manual balance valve still occupies a dominant position in actual application.

[0003] The existing flow regulation and measurement of the manual balance valve generally adopts ultrasonic measurement method or intelligent instrument measurement method. The ultrasonic measurement method is to place a measurement probe on the pipeline. The opening of the valve is adjusted, and then the flow value displayed by the ultrasonic flowmeter is observed. When the design flow is reached, the valve is adjusted. When the ultrasonic measurement method is used, the input parameter is the pipeline parameter. When the parameters of each part of the pipeline are consistent, one-time input can complete the measurement. However, the ultrasonic measurement method also has some defects: 1. The pipeline to be measured needs a certain length of straight pipe section. However, the actual engineering pipeline layout is complex and difficult to meet the installation conditions, which has certain limitations; 2. The insulating structure outside the pipeline needs to be removed during measurement, and the operation steps are relatively complicated; 3. Old pipelines often have rust and scaling phenomena. When the pipeline is rusty or the inner wall of the pipeline is scaled, the ultrasonic signal will be seriously attenuated, which will cause a large measurement error.

[0004] The intelligent instrument measurement method is to connect the measurement probe before and after the valve, and the two ends before and after the valve are provided with connectors connected with the intelligent instrument. The intelligent instrument measurement method can avoid removing the insulating structure of the pipeline and can avoid the influence of pipeline rusting or scaling on the measurement result. However, when the intelligent instrument is used for measurement, the valve diameter and the opening need to be input. The valve diameter is constant, but the valve opening needs to be adjusted repeatedly until the measurement result meets the requirements. The operation steps are relatively complicated, the technical level of the operator is relatively high, and the error of the measurement result may be caused by the misoperation of non-professionals.

[0005] Therefore, a flow regulation method of a manual balance valve is needed, which can eliminate the influence of pipeline rusting or internal scaling on the measurement result, reduce the difficulty of flow regulation and measurement, and ensure the accuracy of the measurement result. SUMMARY

[0006] The application provides a flow regulation method of a manual balancing valve, which can eliminate the influence of pipeline rusting or internal fouling on measurement results, reduce the difficulty of flow regulation and measurement, and ensure the accuracy of measurement results.

[0007] To solve the above problems, the application provides a flow regulation method of a manual balancing valve, which adopts the following technical scheme:

[0008] A flow regulation method of a manual balancing valve, and the specific steps are as follows:

[0009] S1, preparing a flow opening pressure difference table based on the nominal diameter of the manual balancing valve;

[0010] S2, connecting a pressure difference measuring device to the front and rear ends of the manual balancing valve, and obtaining the pressure difference value between the front and rear ends of the manual balancing valve in real time through the pressure difference measuring device;

[0011] S3, gradually increasing the valve opening of the manual regulating valve from small to large, and reading the real-time pressure difference value of the pressure difference measuring device;

[0012] S4, finding the standard pressure difference value corresponding to the current opening in the flow opening pressure difference table, and comparing it with the measured pressure difference value;

[0013] S5, when the measured pressure difference value is greater than the standard pressure difference value, continuously increasing the valve opening and reading the real-time pressure difference value of the pressure difference measuring device, and then comparing it with the measured pressure difference value; when the measured pressure difference value is less than the standard pressure difference value, decreasing the valve opening and reading the real-time pressure difference value of the pressure difference measuring device, and then comparing it with the measured pressure difference value; when the measured pressure difference value is consistent with the standard pressure difference value or within a certain error range, the current opening is the valve opening required to reach the target flow.

[0014] The flow regulation method of the manual balancing valve provided by the application can enable the operator to judge the fluid flow through the manual balancing valve according to the flow opening pressure difference table, compare the pressure difference displayed by the pressure difference measuring device with the standard pressure difference value marked in the flow opening pressure difference table, and when the measured pressure difference is consistent with the standard pressure difference, the flow and opening corresponding to the standard pressure difference value are the current flow and opening of the manual balancing valve. The method detects the flow change in the manual balancing valve by detecting the pressure difference in the manual balancing valve, can avoid measurement errors caused by internal fouling or rusting of the pipeline, improves the measurement accuracy, and at the same time, the comparison of the flow opening pressure difference table also reduces the difficulty of flow regulation of the manual balancing valve, improves the convenience and accuracy of flow measurement in the manual balancing valve.

[0015] Further, the construction method of the flow opening pressure difference table in step S1 is a fluid dynamics simulation experiment to obtain the corresponding data of the pressure difference and flow at different openings.

[0016] Further, the differential pressure measuring device in step S2 is installed vertically relative to the pipeline axis to avoid interference of fluid fluctuation in the pipeline on the measurement data.

[0017] The beneficial effect is that the differential pressure measuring device usually senses the pressure difference in the valve body through the elastic deformation of the diaphragm. When the differential pressure measuring device is installed obliquely, the fluid in the valve body may form turbulent flow at the interface of the differential pressure measuring device, thereby causing fluctuation of the differential pressure signal. By installing the differential pressure measuring device vertically relative to the axis of the pipeline where the manual balancing valve is located, interference of fluid fluctuation in the valve body on the measurement data can be avoided, thereby improving the accuracy of the measurement data.

[0018] Further, the differential pressure measuring device in step S2 is installed vertically relative to the pipeline axis to avoid interference of fluid fluctuation in the pipeline on the measurement data.

[0019] The beneficial effect is that the differential pressure measuring device usually senses the pressure difference in the valve body through the elastic deformation of the diaphragm. When the differential pressure measuring device is installed obliquely, the fluid in the valve body may form turbulent flow at the interface of the differential pressure measuring device, thereby causing fluctuation of the differential pressure signal. By installing the differential pressure measuring device vertically relative to the axis of the pipeline where the manual balancing valve is located, interference of fluid fluctuation in the valve body on the measurement data can be avoided, thereby improving the accuracy of the measurement data.

[0020] Further, the differential pressure measuring device is a mechanical pointer type differential pressure gauge or a digital differential pressure sensor.

[0021] Further, the adjustment interval of the valve opening in step S3 is greater than or equal to the minimum adjustable opening unit of the valve, and the valve is kept stationary for a certain time after each adjustment to ensure that the system fluid state is stable and to avoid measurement errors caused by fluctuation of the flow rate.

[0022] The beneficial effect is that by controlling the adjustment interval of the valve opening to be greater than or equal to the minimum adjustable opening unit of the valve, the pressure change inside the valve body is more obvious when the valve opening is adjusted, thereby ensuring the effectiveness of the valve opening adjustment operation and the observability of the pressure difference inside the valve body. In addition, the fluid flow inside the valve body tends to be stable by keeping the valve stationary for a certain time after each adjustment, which can avoid measurement errors caused by fluctuation of the flow rate of the fluid inside the valve body.

[0023] Further, the error range in step S5 is ±3% of the standard differential pressure value to ensure the measurement accuracy of the differential pressure.

[0024] Further, step S5 further comprises keeping the valve opening of the manual balancing valve stable after the valve opening adjustment is completed, and repeatedly measuring the differential pressure of the manual balancing valve at both ends three times to verify the consistency of the fluid flow in the manual balancing valve, ensuring that the measured differential pressure values of the three measurements are within the error range of ±3% of the standard differential pressure value. If the measured differential pressure value of one of them exceeds the error range, return to step S3 for readjustment.

[0025] The beneficial effect is that: through three repeated measurements of the pressure difference at both ends of the manual balance valve after completing the valve opening adjustment of the manual balance valve, while ensuring that the three measurement results are within the error range of ± 3% of the standard pressure difference value, the accidental error of the measurement data can be eliminated, and the accuracy of the measurement data is ensured.

[0026] Further, the construction method of the flow opening pressure difference table in step S1 is to simulate the use condition of the manual balance valve through the hydraulic test bench, collect the flow, opening and pressure difference data of the valve opening from small to large, and then make a standardized table, the first row of the table is the flow sequence, the first column of the table is the opening sequence, and the measured standard pressure difference value is at the intersection of the row and column.

[0027] Further, the flow opening pressure difference table is stored in the intelligent terminal, and is connected with the pressure difference measuring device through Bluetooth or wireless network to compare and guide the adjustment of the manual balance valve in real time.

[0028] The beneficial effect is that: by storing the flow opening pressure difference table in the intelligent terminal and connecting the pressure difference measuring device through Bluetooth or wireless connection, the operating personnel can adjust the valve opening according to the feedback of the intelligent terminal, and the convenience and accuracy of the flow adjustment of the manual balance valve are improved.

[0029] The beneficial effect of the flow adjustment method of the manual balance valve provided by the application is:

[0030] 1、The flow adjustment method of the manual balance valve provided by the application can make the operating personnel judge the fluid flow through the manual balance valve according to the flow opening pressure difference table by pre-preparing the flow opening pressure difference table according to the nominal diameter of the manual balance valve, compare the pressure difference displayed by the pressure difference measuring device with the standard pressure difference value marked in the flow opening pressure difference table, and when the measured pressure difference is consistent with the standard pressure difference, the flow and opening corresponding to the standard pressure difference value are the current flow and opening of the manual balance valve. The method detects the flow change in the manual balance valve by detecting the pressure difference in the manual balance valve, which can avoid measurement errors caused by internal scaling or rusting of the pipeline, improve the measurement accuracy, and at the same time, the comparison of the flow opening pressure difference table also reduces the difficulty of flow adjustment of the manual balance valve, and improves the convenience and accuracy of flow measurement in the manual balance valve.

[0031] 2、The pressure difference measuring device usually senses the pressure difference in the valve body through the elastic deformation of the diaphragm. When the pressure difference measuring device is installed obliquely, the fluid in the valve body may form turbulence at the interface of the pressure difference measuring device, which may cause the pressure difference signal to fluctuate. By installing the pressure difference measuring device vertically relative to the axis of the pipeline where the manual balance valve is located, the disturbance of the fluid fluctuation in the valve body to the measurement data can be avoided, and the accuracy of the measurement data is improved.

[0032] 3、The zero operation can be performed after the installation of the differential pressure measuring device, so as to eliminate the zero drift of the differential pressure measuring device, avoid the influence on the subsequent measurement results, and ensure the accuracy of the measurement data.

[0033] 4、The adjustment interval of the control valve opening is greater than or equal to the minimum adjustable opening unit of the valve, so that the pressure change in the valve body is more obvious when the opening is adjusted, thereby ensuring the effectiveness of the valve opening adjustment operation and the observability of the pressure difference in the valve body. In addition, the fluid flow in the valve body tends to be stable by determining the standing time after each adjustment, so as to avoid the measurement error caused by the flow fluctuation of the fluid in the valve body.

[0034] 5、The differential pressure between the two ends of the manual balancing valve is measured three times after the valve opening adjustment of the manual balancing valve, and the three measurement results are ensured to be within the ±3% error range of the standard differential pressure value, so as to eliminate the accidental error of the measurement data and ensure the accuracy of the measurement data.

[0035] 6、The flow opening differential pressure table is stored in the intelligent terminal, and the differential pressure measuring device is connected through Bluetooth or wireless connection, so that the operator can adjust the valve opening according to the feedback of the intelligent terminal, and the convenience and accuracy of the flow regulation of the manual balancing valve are improved. BRIEF DESCRIPTION OF DRAWINGS

[0036] The above and other objects, features and advantages of the exemplary embodiments of the present application will be more apparent from the following detailed description taken in conjunction with the accompanying drawings, in which several embodiments of the present application are shown by way of example, and wherein like or corresponding elements refer to like or corresponding parts throughout several views, and in which:

[0037] Fig. 1 A flow regulation method of a manual balancing valve provided by the present application is shown in the flow diagram.

[0038] Fig. 2 A DN50 flow opening differential pressure table. DETAILED DESCRIPTION

[0039] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. It should be known by those skilled in the art that the embodiments described below are part of the embodiments of the present disclosure, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0040] The main concept of the present application is to prepare a flow opening pressure difference table according to the nominal diameter of the manual balancing valve, so that the operator can judge the fluid flow through the manual balancing valve according to the flow opening pressure difference table, compare the pressure difference measured by the pressure difference measuring device with the standard pressure difference value marked in the flow opening pressure difference table, and when the measured pressure difference is consistent with the standard pressure difference, the flow and opening degree corresponding to the standard pressure difference value are the current flow and opening degree of the manual balancing valve. The method detects the flow change in the manual balancing valve by detecting the pressure difference in the manual balancing valve, which can avoid measurement errors caused by internal scaling or rusting of the pipeline, improve the measurement accuracy, and at the same time, the comparison of the flow opening pressure difference table also reduces the difficulty of flow regulation of the manual balancing valve, and improves the convenience and accuracy of flow measurement in the manual balancing valve.

[0041] After introducing the basic principles of the present application, the various non-limiting embodiments of the present application will be specifically introduced below. Any element quantity in the drawings is used for example and not limitation, and any naming is only used for distinction and does not have any limiting meaning.

[0042] The principles and spirits of the present application will be explained in detail below with reference to several representative embodiments of the present application.

[0043] Embodiment 1 of a flow regulation method of a manual balancing valve provided by the present application:

[0044] As shown in Figs. 1-2 , the specific steps of a flow regulation method of a manual balancing valve are as follows:

[0045] S1, a mathematical relationship between opening and flow area is established according to the nominal diameter of a DN50 manual balancing valve by fluid mechanics simulation, and a flow opening pressure difference table of the manual balancing valve with opening degree from 0.4 turns to 5 turns and flow rate from 2 cubic meters / hour to 10 cubic meters / hour is prepared, the DN50 flow opening pressure difference table is designed as a row-column matrix, the first row is the fluid flow in the manual balancing valve, the first column is the opening sequence, and the intersection of the row and column is the standard pressure difference value.

[0046] S2, install a pressure difference measuring device at the front and rear ends of the manual balancing valve, the pressure difference measuring device is a mechanical pointer type pressure difference table or a digital pressure difference sensor, which has a pressure sensor and a signal output interface to obtain the pressure difference value at the front and rear ends of the manual balancing valve in real time; the pressure difference measuring device is installed vertically relative to the pipeline axis during installation, which can avoid turbulence at the interface of the pressure difference measuring device, eliminate the interference of fluid fluctuation in the valve body on the measurement data, and further improve the accuracy of the measurement data.

[0047] The differential pressure measuring device generally senses the pressure difference in the valve body through the elastic deformation of the elastic sensing element, which is usually a diaphragm. When the differential pressure detection device is inclined, the diaphragm will tilt to one side under the action of gravity, causing the differential pressure display data to deviate. Therefore, the part where the elastic sensing element is located in the differential pressure detection device needs to be set vertically to the horizontal plane at the same time to eliminate the influence of gravity on the pressure difference at both ends of the manual balance valve.

[0048] After the installation of the differential pressure measuring device is completed, the zero operation is performed to eliminate the zero drift phenomenon that may be generated by the differential pressure measuring device, avoid affecting the subsequent measurement results, and thus ensure the accuracy of the differential pressure measurement data.

[0049] S3, slowly increase the opening degree of the manual balance valve, and after each adjustment, stand still for 10 seconds to ensure that the fluid flow rate in the manual balance valve is stable, and read the real-time pressure difference value of the differential pressure measuring device;

[0050] When adjusting the valve opening degree of the manual balance valve, the adjustment interval of the valve opening degree is greater than or equal to the minimum adjustable opening degree unit of the valve, so that the valve body inside the manual balance valve has a significant pressure change when the opening degree is adjusted, thereby ensuring the effectiveness of the valve opening degree adjustment operation and the observability of the pressure difference change inside the valve body. In addition, by standing still for 10 seconds after each adjustment, the fluid flow in the valve body of the manual balance valve can be gradually stabilized, avoiding measurement errors caused by fluctuations in the flow rate of the fluid in the valve body of the manual balance valve.

[0051] S4, find the standard pressure difference value corresponding to the current opening degree in the flow opening pressure difference table, and then compare the real-time pressure difference value with the standard pressure difference value in the flow opening pressure difference table.

[0052] S5, when the measured pressure difference value of the manual balance valve is greater than the standard pressure difference value, increase the valve opening degree and read the real-time pressure difference value of the differential pressure measuring device, and compare it with the measured pressure difference value after standing still for 10 seconds; when the measured pressure difference value of the manual balance valve is less than the standard pressure difference value, decrease the valve opening degree and read the real-time pressure difference value of the differential pressure measuring device, and compare it with the measured pressure difference value after standing still for 10 seconds. Adjust continuously until the measured pressure difference value of the manual balance valve is consistent with the standard pressure difference value or within a certain error range, the certain error range is ±3% of the standard pressure difference value, and then stop adjusting.

[0053] After the valve opening degree adjustment is completed, the valve body opening degree of the manual balance valve is kept stable, the pressure difference is measured again to verify the consistency of the fluid flow in the manual balance valve, and the measurement is repeated three times, the measured pressure difference value of the three times is within the error range of ±3% of the standard pressure difference value, at this time the current opening degree of the manual balance valve is the valve opening degree required to reach the target flow, if the measured pressure difference value of one of them exceeds the error range, return to step S3 to adjust again. In addition, the flow opening degree pressure difference table is stored on the mobile phone or computer, connected with the pressure difference measuring device through Bluetooth or wireless network, can compare the measurement data in real time and guide the operator to adjust the manual balance valve, improve the convenience and accuracy of the flow adjustment of the manual balance valve.

[0054] By using the flow opening degree pressure difference table to adjust and measure the flow of the manual balance valve, the operator can complete the measurement of the corresponding fluid flow at different opening degrees by comparing the measured pressure difference value and the standard pressure difference value, without the need for training the operator, which reduces the difficulty of flow adjustment of the manual balance valve and also ensures the measurement accuracy. In addition, the method of measuring the pressure difference between the two ends of the manual balance valve can eliminate the interference of pipe corrosion and scaling on the measurement results, and improve the applicability of the flow measurement method.

[0055] Embodiment 2 of the flow regulation method of the manual balance valve provided by the application:

[0056] The difference between the two mainly lies in:

[0057] In embodiment 1, the flow opening degree pressure difference table is obtained through fluid mechanics simulation experiment.

[0058] In this embodiment, the flow opening degree pressure difference table is simulated by a hydraulic test bench to simulate the use condition of the manual balance valve, collects the flow, opening degree and pressure difference data from small to large valve opening degree, and then makes a standardized table, the first row of the table is the flow sequence, the unit is cubic meter / hour, the first column of the table is the opening degree sequence, the unit is circle, and the intersection of the row and column is the measured standard pressure difference value, the unit is kilopascal.

[0059] Embodiment 3 of the flow regulation method of the manual balance valve provided by the application:

[0060] The difference between the two mainly lies in:

[0061] In embodiment 1, the opening degree of the manual balance valve is adjusted from small to large, and the pressure difference between the front and back of the valve body changes from large to small.

[0062] In this embodiment, the opening degree of the manual balance valve is adjusted from large to small, and the pressure difference between the front and back of the valve body changes from small to large.

[0063] According to the above description of the present specification, those skilled in the art can also understand that the terms used such as "upper", "lower", "front", "back", "left", "right", "width", "horizontal", "top", "bottom", "inner", "outer" and the like indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the drawings of the present specification, which are only for the purpose of facilitating the description of the present application and simplifying the description, and are not explicitly or implicitly indicated that the devices or elements involved must have the specific orientation, be constructed and operated in a specific orientation, therefore the above-mentioned orientation or positional relationship terms cannot be understood or interpreted as a limitation on the present application.

[0064] In addition, in the description of the present specification, the meaning of "a plurality of" is at least two, such as two, three or more, etc., unless otherwise explicitly and specifically limited.

Claims

1. A flow regulation method for a manual balancing valve, characterized in that: The specific steps are as follows: S1. Prefabricate the flow opening differential pressure table based on the nominal diameter of the manual balancing valve; S2. Connect a pressure differential measuring device to the front and rear ends of the manual balancing valve, and obtain the pressure differential value of the front and rear ends of the manual balancing valve in real time through the pressure differential measuring device; S3. Gradually increase the valve opening of the manual regulating valve from small to large, and read the real-time differential pressure value of the differential pressure measuring device; S4. Find the standard pressure differential value corresponding to the current opening in the flow opening pressure differential table and compare it with the measured pressure differential value; S5. When the measured differential pressure value is greater than the standard differential pressure value, continue to increase the valve opening and read the real-time differential pressure value of the differential pressure measuring device, and then compare it with the measured differential pressure value; when the measured differential pressure value is less than the standard differential pressure value, reduce the valve opening and read the real-time differential pressure value of the differential pressure measuring device, and then compare it with the measured differential pressure value; when the measured differential pressure value is consistent with the standard differential pressure value or is within the determined error range, the current opening is the valve opening required to achieve the target flow rate.

2. A flow regulation method for a manual balancing valve according to claim 1, characterized in that: The flow opening pressure differential table in step S1 is constructed by a fluid dynamics simulation experiment to obtain corresponding data of the pressure difference and flow rate at both ends of the valve at different openings.

3. The flow regulation method of a manual balancing valve according to claim 1, characterized in that: In step S2, the pressure difference measuring device is installed vertically relative to the pipeline axis to avoid interference of fluid fluctuations in the pipeline on the measurement data.

4. A flow regulation method for a manual balancing valve according to claim 3, characterized in that: In step S2, the pressure difference measuring device is reset after being installed on the manual balancing valve to avoid affecting the measurement accuracy.

5. The flow regulation method of a manual balancing valve according to claim 4, characterized in that: The pressure difference measuring device is a mechanical pointer type pressure difference gauge or a digital pressure difference sensor.

6. The flow regulation method of a manual balancing valve according to claim 1, characterized in that: The adjustment interval of the valve opening in step S3 is greater than or equal to the minimum adjustable opening unit of the valve. After each adjustment, the valve is left to stand for a certain time to ensure that the system fluid state is stable and avoid measurement errors caused by flow rate fluctuations.

7. The flow regulation method of a manual balancing valve according to claim 1, characterized in that: The error range in step S5 is ±3% of the standard pressure difference value to ensure the measurement accuracy of the pressure difference.

8. The flow rate regulating method of a manual balancing valve according to claim 7, characterized in that: Step S5 also includes maintaining the valve body opening of the manual balancing valve stable after the valve opening adjustment is completed, and repeatedly measuring the pressure difference at both ends of the manual balancing valve three times to verify the consistency of the fluid flow in the manual balancing valve, ensuring that the measured pressure difference values ​​of the three measurements are all within the ±3% error range of the standard pressure difference value. If one of the measured pressure difference values ​​exceeds the error range, return to step S3 for re-adjustment.

9. The flow rate regulating method of a manual balancing valve according to claim 1, characterized in that: The method for constructing the flow opening differential pressure table described in step S1 is to simulate the operating conditions of the manual balancing valve through a hydraulic test bench, collect the flow, opening and pressure differential data of the valve opening from small to large, and then make a standardized table, the first row of the table is the flow sequence, the first column of the table is the opening sequence, and the intersection of the rows and columns is the measured standard pressure differential value.

10. A flow regulation method for a manual balancing valve according to any one of claims 1 to 9, characterized in that: The flow opening differential pressure table is stored in the smart terminal and is connected to the differential pressure measuring device via Bluetooth or a wireless network to compare and guide the adjustment of the manual balancing valve in real time.

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