Method for measuring precision of regulating valve

Abstract

Disclosed in the present invention is a method for measuring the precision of a regulating valve. The method for measuring the precision of a regulating valve comprises the following steps: measuring the pre-rotation distance between a free end of a transmission rod and a base, and the pre-rotation distance between a valve core and an outlet; forward rotating a transmission nut N circles; backward rotating the transmission nut N circles; measuring the post-rotation distance between the free end of the transmission rod and the base, and the post-rotation distance between the valve core and the outlet; and, by means of the pre-rotation distance between the free end of the transmission rod and the base, the pre-rotation distance between the valve core and the outlet, the post-rotation distance between the free end of the transmission rod and the base, and the post-rotation distance between the valve core and the outlet, determining the precision of the regulating valve. The method for measuring the precision of a regulating valve in the present invention has the advantages of convenient measurement and being simple and rapid, such that a user can finely adjust the regulating valve promptly on the basis of the precision of the regulating valve, thereby improving the reliability and stability of the regulating valve.

Description

A method for measuring the accuracy of regulating valve Technical Field

[0001] The present invention relates to the technical field of regulating equipment, and further to a method for measuring the accuracy of a regulating valve. Background Art

[0002] Control valves are flow regulating components widely used in the industrial process control field of industrial enterprises such as petroleum, chemical, electric power, and metallurgy. The driving components connected to the valve core of the control valve serve as the actuator of the control system. The control system controls the movement of the driving components to change the flow area of ​​the control valve, thereby achieving the purpose of flow regulation.

[0003] Control accuracy is a critical performance characteristic of control valves. According to the mechanical standard (JB / T 7387), technical indicators related to accuracy include basic error, hysteresis, and deadband. While these three indicators reflect the overall accuracy of the control valve, they cannot fully reflect the impact of individual valve components on accuracy. Furthermore, overall measurement methods are complex, making it difficult to quickly measure and calculate control valve accuracy.

[0004] Summary of the Invention

[0005] In view of the above technical problems, an object of the present invention is to provide a method for measuring the accuracy of a control valve, which can solve the problems raised in the above background technology.

[0006] In order to achieve the above object, the present invention provides a method for measuring the accuracy of a regulating valve, comprising:

[0007] The regulating valve includes a valve body, an actuator is connected to the valve body, a flow channel is defined in the valve body, a valve core is provided in the flow channel, and an outlet is provided at one end of the flow channel, the valve core is connected to a transmission rod, a base is provided on a side of the actuator close to the valve body, the transmission rod passes through the base and is sleeved with a transmission nut, and the transmission rod can move closer to or away from the flow channel when the transmission nut is rotated, so that the valve core can move along the flow channel;

[0008] The method for measuring the accuracy of a regulating valve comprises the following steps:

[0009] measuring the distance between the free end of the transmission rod and the base before rotation, and the distance between the valve core and the outlet before rotation;

[0010] Rotate the transmission nut forward N turns;

[0011] Rotate the transmission nut in the opposite direction N times;

[0012] measuring the distance between the free end of the rotating transmission rod and the base and the distance between the rotating valve core and the outlet;

[0013] The accuracy of the regulating valve is obtained by calculating the distance between the free end of the transmission rod and the base before rotation, the distance between the valve core and the outlet before rotation, the distance between the free end of the transmission rod and the base after rotation, and the distance between the valve core and the outlet after rotation.

[0014] The accuracy of the regulating valve is obtained by measuring the distance between the free end of the transmission rod and the base before rotation, the distance between the valve core and the outlet before rotation, the distance between the free end of the transmission rod and the base after rotation, and the distance between the valve core and the outlet after rotation. This method has the advantages of convenient measurement and simple and quick method, thereby enabling personnel to fine-tune the regulating valve in time according to the accuracy of the regulating valve, so as to improve the reliability and stability of the regulating valve.

[0015] In some embodiments, the accuracy of the regulating valve is calculated using the following formula:

[0016] Among them, L1 is the distance between the free end of the transmission rod and the base before rotation, L2 is the distance between the valve core and the outlet before rotation, L3 is the distance between the free end of the transmission rod and the base after rotation, L4 is the distance between the valve core and the outlet after rotation, and L is the rated stroke of the regulating valve.

[0017] In some embodiments, before the step of measuring the distance between the free end of the transmission rod and the base before rotation and the distance between the valve core and the outlet before rotation, the method further includes the step of removing the actuator and retaining the base.

[0018] By removing the actuator and retaining the base, the transmission nut is exposed to the external environment, making it easier for personnel to rotate it with tooling. It also allows for real-time observation during the rotation of the transmission nut, thereby providing the necessary guarantee for the accuracy and precision of the operation.

[0019] In some embodiments, between the steps of removing the actuator and retaining the base and measuring the distance between the free end of the transmission rod and the base before rotation, and the distance between the valve core and the outlet before rotation, there is also a step of: rotating the transmission nut in the forward direction, and stopping rotating the transmission nut when the valve core starts to move.

[0020] By rotating the transmission nut in the forward direction before measuring the distance between the free end of the transmission rod and the base before rotation and the distance between the valve core and the outlet before rotation, and stopping the rotation of the transmission nut when the valve core starts to move, excessive invalid rotation in the subsequent rotation of the transmission nut can be effectively avoided, thereby causing error in the measurement results, and further optimizing the speed and convenience of the measurement method.

[0021] In some embodiments, the step of measuring the distance between the free end of the transmission rod and the base before rotation, the distance between the valve core and the outlet before rotation, and the step of rotating the transmission nut N turns in the forward direction also includes the step of setting an aligned marking group on the transmission nut and the base.

[0022] By setting an aligned marking group on the transmission nut and the base, a reference is provided for rotating the transmission nut, which effectively ensures the precision and accuracy of rotating the transmission nut, thereby providing an effective prerequisite for subsequent steps and effectively avoiding possible errors in the method of measuring the accuracy of the control valve.

[0023] In some embodiments, the marking group includes a first scale line and a second scale line, and the first scale line and the second scale line are respectively arranged on the transmission nut and the base, and correspond to the same straight line.

[0024] By painting the first scale line and the second scale line on the transmission nut and the base, it is convenient for personnel to observe whether the first scale line and the second scale line can be connected to form a whole line after rotating the transmission nut N circles, so as to judge whether the transmission nut has been rotated a complete circle, thereby effectively ensuring the accuracy of the operating steps, and thus providing a strong guarantee for the method of measuring the accuracy of the control valve.

[0025] In some embodiments, if the valve core does not move after the transmission nut is rotated N times in the reverse direction, the following steps are performed: rotating the transmission nut 2N times in the forward direction and rotating the transmission nut 2N times in the reverse direction.

[0026] By increasing the number of turns of the transmission nut, the valve core is displaced, and effective data can be obtained through measurement to ensure that the method for obtaining the accuracy of the regulating valve can be used normally.

[0027] In some embodiments, the method for measuring the accuracy of a regulating valve provided by the present invention further includes:

[0028] The accuracy of the base is calculated using the following formula:

[0029] Wherein, A is the accuracy of the base.

[0030] By measuring the accuracy of the base, we can determine whether the accuracy of the base meets the standard, and then adjust the base according to the actual situation to improve the accuracy of the control valve, thereby effectively optimizing the reliability of the control valve.

[0031] In some embodiments, the method for measuring the accuracy of a regulating valve provided by the present invention further includes:

[0032] The common accuracy of the valve body and the base is calculated using the following formula:

[0033] Wherein, B is the common accuracy of the valve body and the base.

[0034] By measuring the accuracy of the regulating valve and the base, it is determined whether the accuracy of the valve core in the regulating valve meets the standards. Then, according to the actual situation, the components of the regulating valve are adjusted to improve the accuracy, thereby further optimizing the reliability of the regulating valve.

[0035] In some embodiments, when A, B, and C are all less than the basic error value, it is judged that the accuracy of the regulating valve meets the accuracy standard; when any one of A, B, and C is not less than the basic error value, it is judged that the accuracy of the regulating valve does not meet the accuracy standard.

[0036] Compared with the prior art, the method for measuring the accuracy of a regulating valve provided by the present invention has the following beneficial effects:

[0037] 1. The method for measuring the accuracy of a regulating valve provided by the present invention measures the distance between the free end of the transmission rod and the base before rotation, the distance between the valve core and the outlet before rotation, the distance between the free end of the transmission rod and the base after rotation, and the distance between the valve core and the outlet after rotation to obtain the accuracy of the regulating valve. This method has the advantages of convenient measurement and a simple and quick method, thereby enabling personnel to fine-tune the regulating valve in a timely manner based on the accuracy of the regulating valve, thereby improving the reliability and stability of the regulating valve.

[0038] 2. The method for measuring the accuracy of a regulating valve provided by the present invention provides a reference for rotating the transmission nut by setting an aligned marking group on the transmission nut and the base, and also effectively ensures the precision and accuracy of rotating the transmission nut, thereby providing an effective prerequisite for subsequent steps, and effectively avoiding possible errors in the method for measuring the accuracy of a regulating valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] The preferred embodiments will be described below in a clear and understandable manner with reference to the accompanying drawings to further illustrate the above-mentioned characteristics, technical features, advantages and implementation methods of the present invention.

[0040] FIG1 is a schematic flow chart of the steps of a method for measuring the accuracy of a regulating valve according to a preferred embodiment of the present invention;

[0041] 2 is a schematic front view of the structure of a regulating valve in a method for measuring the accuracy of a regulating valve according to a preferred embodiment of the present invention;

[0042] FIG3 is a schematic diagram of a top view of a regulating valve in a method for measuring the accuracy of a regulating valve according to a preferred embodiment of the present invention.

[0043] Description of the accompanying drawings: valve body 10 , base 20 , second scale line 21 , transmission nut 30 , first scale line 31 , transmission rod 40 , valve core 50 . DETAILED DESCRIPTION

[0044] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the specific embodiments of the present invention will be described below with reference to the accompanying drawings. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings and other embodiments can be obtained based on these drawings without inventive work.

[0045] To simplify the drawings, only portions relevant to the invention are schematically depicted in each figure; they do not represent the actual structure of the product. Furthermore, to simplify the drawings and facilitate understanding, in some figures, only one component with the same structure or function is schematically depicted or labeled. In this document, "one" not only means "only one" but also "more than one."

[0046] It should be noted that, unless otherwise specified or limited, the terms "installed," "connected," and "connected" should be understood broadly. For example, they can refer to fixed, detachable, or integral connections; mechanical or welded connections; direct or indirect connections through an intermediary; and internal communication between two components. Those skilled in the art will understand the specific meanings of these terms in the present invention based on the specific circumstances.

[0047] In addition, in the description of the present application, the terms "first", "second", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0048] In one embodiment, with reference to Figures 1, 2, and 3 of the specification, the present invention provides a method for measuring the accuracy of a regulating valve, wherein the regulating valve includes a valve body 10, an actuator is connected to the valve body 10, a flow channel is opened in the valve body 10, a valve core 50 is provided in the flow channel, and an outlet is provided at one end of the flow channel, the valve core 50 is transmission-connected to a transmission rod 40, a base 20 is provided on the side of the actuator close to the valve body 10, the transmission rod 40 passes through the base 20 and is sleeved with a transmission nut 30, the transmission rod 40 can approach or move away from the flow channel when the transmission nut 30 is rotated, so that the valve core 50 can move along the flow channel, and the method for measuring the accuracy of the regulating valve includes the following steps: step Step S1: Measure the distance between the free end of the transmission rod 40 and the base 20 before rotation, and the distance between the valve core 50 and the outlet before rotation; Step S2: Rotate the transmission nut 30N turns in the forward direction; Step S3: Rotate the transmission nut 30N turns in the reverse direction; Step S4: Measure the distance between the free end of the transmission rod 40 and the base 20 after rotation, and the distance between the valve core 50 and the outlet after rotation; Step S5: Calculate the accuracy of the regulating valve by measuring the distance between the free end of the transmission rod 40 and the base 20 before rotation, the distance between the valve core 50 and the outlet before rotation, the distance between the free end of the transmission rod 40 and the base 20 after rotation, and the distance between the valve core 50 and the outlet after rotation.

[0049] Specifically, a flow channel is opened through the valve body 10, and the two ends of the flow channel are respectively set as an inlet and an outlet. The actuator is generally arranged between the outlet and the inlet of the corresponding flow channel on the valve body 10. The actuator is generally connected to the valve core 50 in the flow channel through a transmission rod 40. Personnel can observe the state of the valve core 50 from the end of one side of the valve body 10. A transmission nut 30 that can adjust the transmission rod 40 is provided on the transmission rod 40. Personnel can rotate the transmission nut 30 to move the position of the valve body 10 in the flow channel, thereby controlling the flow rate of the medium flowing through the flow channel.

[0050] In order to obtain the necessary data for calculating the accuracy of the regulating valve, use a depth gauge to measure the distance between the free end of the transmission rod 40 and the base 20 before rotation, as well as the distance between the valve core 50 and the outlet before rotation, and record the corresponding data. Then use a tool to rotate the transmission nut 30, so that the transmission nut 30 is first rotated forward N circles, and then rotated backward N circles. Use the depth gauge again to measure the distance between the free end of the transmission rod 40 and the base 20 after rotation, as well as the distance between the valve core 50 and the outlet after rotation, and record the corresponding data again. By substituting the four data obtained into the corresponding formula, the accuracy of the corresponding regulating valve can be obtained.

[0051] In some implementations, based on the above embodiments, with reference to Figures 1 and 3 of the specification, the accuracy of the regulating valve is calculated using the following formula:

[0052] Among them, L1 is the distance between the free end of the transmission rod 40 and the base 20 before rotation, L2 is the distance between the valve core 50 and the outlet before rotation, L3 is the distance between the free end of the transmission rod 40 and the base 20 after rotation, L4 is the distance between the valve core 50 and the outlet after rotation, and L is the rated stroke of the regulating valve.

[0053] Specifically, due to the gap between the parts in the regulating valve when they fit together, when the direction of valve movement changes, the active part must go through a certain distance before the various parts can contact each other, and then the driven part will continue to move, and this distance is the idle stroke. According to the measured data, the idle stroke of the base 20 is ∣L1-L3∣, the idle stroke of the base 20 and the valve body is ∣L2-L4∣, and the idle stroke of the valve body is ∣L2-L4∣-∣L1-L3∣. Generally speaking, the transmission ratio between the transmission rod 40 and the valve core 50 is 1:1. The accuracy of the regulating valve can be obtained by calculating the ratio of the idle stroke of the valve body to the rated stroke of the regulating valve.

[0054] In one embodiment, based on the above embodiment, referring to Figures 1 and 3 of the specification, before step S1 of measuring the distance between the free end of the transmission rod 40 and the base 20 before rotation and the distance between the valve core 50 and the outlet before rotation, step S0 is also included: removing the actuator and retaining the base 20.

[0055] Specifically, the actuator is removed and the base 20 is retained so that the transmission nut 30 is exposed to the external environment, thereby facilitating personnel to rotate the nut 30 with tooling, and facilitating real-time observation during the rotation of the transmission nut 30, thereby providing necessary guarantees for the accuracy and precision of the operation.

[0056] In one embodiment, based on the above embodiment, with reference to Figures 1 and 2 of the specification, between step S0 of removing the actuator and retaining the base 20 and step S1 of measuring the distance between the free end of the transmission rod 40 and the base 20 before rotation, and the distance between the valve core 50 and the outlet before rotation, step S01 is also included: rotating the transmission nut 30 in the forward direction, and when the valve core 50 starts to move, stopping the rotation of the transmission nut 30.

[0057] Specifically, before measuring the distance between the free end of the front transmission rod 40 and the base 20 and the distance between the front valve core 50 and the outlet, the transmission nut 30 is rotated forward, and when the valve core 50 starts to move, the transmission nut 30 is stopped to avoid excessive invalid rotation when the transmission nut 30 is rotated subsequently, thereby causing errors in the measurement results.

[0058] In one embodiment, referring to Figures 1, 2 and 3 of the specification, step S1 of measuring the distance between the free end of the transmission rod 40 and the base 20 before rotation, the distance between the valve core 50 and the outlet before rotation, and step S01 of forwardly rotating the transmission nut 30N turns also include step S11: setting an aligned marking group on the transmission nut 30 and the base 20.

[0059] Specifically, since there are generally no obvious markings on the transmission nut 30 and the base 20, the accuracy of rotating the transmission nut 30 is poor. Therefore, an aligned marking group is set on the transmission nut 30 and the base 20, so that the rotating transmission nut 30 can use the marking group as a reference to judge the amplitude of rotation, thereby effectively improving the accuracy of the rotating transmission nut 30, and thus providing a guarantee for the reliability of the method for measuring the accuracy of the regulating valve.

[0060] In one embodiment, based on the above embodiment, referring to Figures 2 and 3 of the specification, the marking group includes a first scale line 31 and a second scale line 21, and the first scale line 31 and the second scale line 21 are respectively arranged on the transmission nut 30 and the base 20, and correspond to the same straight line.

[0061] Specifically, a marking pen is used to draw the first scale line 31 and the second scale line 21 on the transmission nut 30 and the base 20 respectively, and the first scale line 31 and the second scale line 21 are connected to form an integral line so that the rotating transmission nut 30 has a reference. After the transmission nut 30 rotates an integer number of times, the first scale line 31 and the second scale line 21 can still be connected to form an integral line. By observing that the first scale line 31 and the second scale line 21 can be connected to form an integral line, it can be judged whether the transmission nut 30 has rotated a complete circle, thereby providing a strong guarantee for the method of measuring the accuracy of the regulating valve.

[0062] In one embodiment, based on the above embodiment, referring to Figures 1 and 3 of the specification, if the valve core 50 does not move after the transmission nut is rotated 30N times in the reverse direction, the steps are performed: rotating the transmission nut 30 in the forward direction for 2N times and rotating the transmission nut 30 in the reverse direction for 2N times.

[0063] Specifically, when N is not large enough, the displacement of the valve core is too small to be measured using a depth gauge. Therefore, in order to ensure the validity and availability of the data, the transmission nut 30 is first rotated forward 2N turns, and then the transmission nut 30 is rotated reversely 2N turns to allow the transmission nut to be displaced, thereby providing valid data for the calculation of the control valve accuracy.

[0064] In one embodiment, based on the above embodiment, with reference to FIG1 and FIG3 of the specification, the method for measuring the accuracy of the regulating valve provided by the present invention further includes the accuracy of the base 20. The accuracy of the base 20 is calculated using the following formula:

[0065] Wherein, A is the accuracy of the base 20.

[0066] Specifically, the accuracy of the base 20 is measured to determine whether the accuracy of the base 20 meets the standard, and then the base 20 is adjusted according to actual conditions to improve the accuracy of the regulating valve, thereby effectively optimizing the reliability of the regulating valve.

[0067] In one embodiment, based on the above embodiment, with reference to Figures 1, 2, and 3 of the specification, the method for measuring the accuracy of a regulating valve provided by the present invention also includes the accuracy of the valve body 10 and the base 20. The accuracy of the valve body 10 and the base 20 is calculated using the following formula:

[0068] Here, B is the common accuracy of the valve body 10 and the base 20 .

[0069] Specifically, by measuring the accuracy of the valve body 10 and the base 20, it is determined whether the accuracy of the valve core 50 in the regulating valve meets the standard, and then the components in the valve body 10 are adjusted according to actual conditions to improve the accuracy, thereby effectively optimizing the reliability of the regulating valve.

[0070] In one embodiment, referring to Figure 3 of the specification, when A, B, and C are all less than the basic error value, it is judged that the accuracy of the control valve meets the accuracy standard; when any one of A, B, and C is not less than the basic error value, it is judged that the accuracy of the control valve does not meet the accuracy standard.

[0071] Specifically, a set of experimental data is obtained, specifically: the stroke of the regulating valve is 90mm, and the depth gauge is used to measure L1 = 32.60mm, L2 = 113.50mm, L3 = 33.12mm, L4 = 114.43mm;

[0072] According to the calculation formula:

[0073] The idle travel of the base 20 is 33.12 mm - 32.60 mm = 0.52 mm;

[0074] The idle travel of the base 20 and the valve body is 114.43mm-113.50mm=0.93mm;

[0075] Valve body idle stroke c = 0.93mm-0.52mm = 0.41mm;

[0076] The accuracy of the base 20 B = 0.52 / 90 × 100% = 0.58%

[0077] The common accuracy of the base 20 and the valve body is A = 0.93 / 90 × 100% = 1.03%

[0078] Valve body accuracy C = 0.41 / 90 × 100% = 0.46%

[0079] The above data shows that the factor most affecting the accuracy of the control valve is the base 20. The method for improving accuracy is to adjust the base 20. Furthermore, according to the mechanical standard "Electric Control Valves for Industrial Process Control" (JB / T7387-2014), the combined accuracy of the valve body 10 and the base 20, 1.03%, exceeds the Class 1.0 standard by 1%. Therefore, it can be generally concluded that this control valve as a whole is unlikely to meet the Class 1.0 requirements for basic error, hysteresis, and deadband.

[0080] It should be noted that the above embodiments can be freely combined as needed. The above are only preferred embodiments of the present invention. It should be noted that those skilled in the art can make several improvements and modifications without departing from the principles of the present invention, and such improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A method for measuring the accuracy of a regulating valve, characterized in that: The regulating valve comprises a valve body, an actuator is connected to the valve body, a flow channel is opened in the valve body, a valve core is arranged in the flow channel, and an outlet is arranged at one end of the flow channel, the valve core is transmission-connected with a transmission rod, a base is arranged on the side of the actuator close to the valve body, a transmission nut is sleeved on the transmission rod through the base, and the transmission rod can approach or move away from the flow channel when the transmission nut is rotated, so that the valve core can move along the flow channel; The method for measuring the accuracy of the regulating valve comprises the following steps: Measuring the distance between the free end of the transmission rod and the base before rotation and the distance between the valve core and the outlet before rotation; Rotate the transmission nut N turns forward; Rotate the transmission nut N turns in the opposite direction; Measuring the distance between the free end of the rotating transmission rod and the base and the distance between the rotating valve core and the outlet; The accuracy of the regulating valve is obtained by calculating the distance between the free end of the transmission rod and the base before rotation, the distance between the valve core and the outlet before rotation, the distance between the free end of the transmission rod and the base after rotation, and the distance between the valve core and the outlet after rotation.

2. The method for measuring the accuracy of a regulating valve according to claim 1, characterized in that: The accuracy of the regulating valve is calculated using the following formula: Wherein, L1 is the distance between the free end of the transmission rod and the base before rotation, L2 is the distance between the valve core and the outlet before rotation, L3 is the distance between the free end of the transmission rod and the base after rotation, L4 is the distance between the valve core and the outlet after rotation, and L is Rated travel of the regulating valve.

3. The method for measuring the accuracy of a regulating valve according to claim 2, characterized in that: Before the step of measuring the distance between the free end of the transmission rod and the base before rotation and the distance between the valve core and the outlet before rotation, the step also includes: removing the actuator and retaining the base.

4. The method for measuring the accuracy of a regulating valve according to claim 3, characterized in that: Between the steps of removing the actuator and retaining the base and measuring the distance between the free end of the transmission rod and the base before rotation and the distance between the valve core and the outlet before rotation, there is also a step of: rotating the transmission nut in the forward direction, and stopping rotating the transmission nut when the valve core starts to move.

5. The method for measuring the accuracy of a regulating valve according to claim 4, characterized in that: The step of measuring the distance between the free end of the transmission rod and the base before rotation, the distance between the valve core and the outlet before rotation, and the step of rotating the transmission nut N circles in the forward direction also includes the step of setting an aligned marking group on the transmission nut and the base.

6. The method for measuring the accuracy of a regulating valve according to claim 5, characterized in that: The marking group includes a first scale line and a second scale line, wherein the first scale line and the second scale line are respectively arranged on the transmission nut and the base and correspond to the same straight line.

7. The method for measuring the accuracy of a regulating valve according to any one of claims 1 to 6, characterized in that: If the valve core does not move after the transmission nut is rotated N times in the reverse direction, the following steps are performed: the transmission nut is rotated 2N times in the forward direction and the transmission nut is rotated 2N times in the reverse direction.

8. The method for measuring the accuracy of a regulating valve according to claim 7, characterized in that: Also includes: The accuracy of the base is calculated using the following formula: Wherein, A is the accuracy of the base.

9. The method for measuring the accuracy of a regulating valve according to claim 8, characterized in that: Also includes: The common accuracy of the valve body and the base is calculated using the following formula: Wherein, B is the common accuracy of the valve body and the base.

10. The method for measuring the accuracy of a regulating valve according to claim 8 or 9, characterized in that: When A, B, and C are all less than the basic error value, it is judged that the accuracy of the regulating valve meets the accuracy standard. When any one of A, B, and C is not less than the basic error value, it is judged that the accuracy of the regulating valve does not meet the accuracy standard.

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