Indirect acting gas pressure regulator static characteristic replacement test device and test method

Abstract

The application discloses a static characteristic alternative testing device for an indirect acting pressure regulator, which comprises a gas supply device, a high-pressure gas supply device, a main valve body control pipeline, a pressure control pipeline and a pilot pipeline, wherein the gas supply device is composed of a compressor unit and an air storage tank; the outlet of the air storage tank is connected with a main valve body testing pipeline and the pressure control pipeline respectively; a main valve body pipeline pressure control device, a main valve body of a measured pressure regulator and a main valve body pipeline flow regulating valve are sequentially installed on the main valve body control pipeline; the pressure control pipeline is connected with the main valve body pipeline pressure control device; and the outlet of the high-pressure gas supply device is connected with a high-pressure pressure reducing valve, a pilot of the measured pressure regulator and a pilot pipeline flow control device through the pilot pipeline in sequence. The device can complete the static characteristic testing of the pressure regulator by using test data in a low-pressure and small-flow testing environment, thereby reducing the energy consumption of testing and lowering the pressure and flow requirements of the testing system.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of performance testing of urban gas equipment, and particularly relates to a static characteristic substitution testing device and testing method for an indirect-acting pressure regulator. BACKGROUND

[0002] In a gas transmission and distribution system, an indirect-acting gas pressure regulator plays a role of regulating the upstream gas pressure to meet the downstream demand pressure, and has the characteristics of large flow and high pressure compared with a direct-acting pressure regulator, and is widely applied in municipal gas systems. The static characteristic thereof needs to be selected and matched according to the use occasion, otherwise, the flow capacity may be too small to meet the downstream gas demand, or the flow capacity may be too large to cause poor pressure stability.

[0003] At present, there are deficiencies in the testing conditions of the gas pressure regulator under high pressure and large flow conditions in China, and the testing process consumes a lot of energy, which causes the pressure regulator to lack sufficient testing data. In addition, the static characteristic performance of the indirect-acting pressure regulator can be known only after the actual field is installed and the gas is tested, and once the type selection is not appropriate or the pressure regulator has a fault, great time and economic losses will be caused. Therefore, a method for pre-acquiring the static characteristic performance of the indirect-acting gas pressure regulator is urgently needed in the type selection testing and factory testing stages of the indirect-acting gas pressure regulator. SUMMARY

[0004] In view of the above deficiencies in the prior art, the present application provides a static characteristic substitution testing device for an indirect-acting pressure regulator, which can complete the static characteristic testing of the pressure regulator by using test data under a low pressure and small flow testing environment, thereby reducing the testing energy consumption and lowering the pressure and flow requirements of the testing system.

[0005] Another object of the present application is to provide a testing method for the above-mentioned static characteristic substitution testing device for an indirect-acting pressure regulator.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is: an indirect-acting pressure regulator static characteristic substitution test device, characterized in that: it includes a gas supply device for providing test gas source for the main valve body of the pressure regulator and power gas source for the pneumatic valve, a high-pressure gas supply device for providing test gas source for the pressure regulator's pilot valve, a main valve body control pipeline, a pressure control pipeline, and a pilot valve pipeline. The gas supply device is composed of a compressor unit and an air storage tank connected together. The outlet of the air storage tank is connected to the main valve body test pipeline and the pressure control pipeline respectively. The main valve body control pipeline is sequentially equipped with a main valve body pipeline pressure control device, the main valve body of the pressure regulator under test, and a main valve body pipeline flow regulating valve. The pressure control pipeline is connected to the main valve body pipeline pressure control device to provide it with regulating gas source. The outlet of the high-pressure gas supply device is sequentially connected to a high-pressure reducing valve, the pilot valve of the pressure regulator under test, and a pilot valve pipeline flow control device through the pilot valve pipeline.

[0007] The above-mentioned test apparatus for a static characteristic substitution test device of an indirect-acting voltage regulator is characterized by comprising the following steps:

[0008] (A1) With the controller connected in normal operating condition, set the outlet pressure of the pressure regulator under test to its initial minimum outlet pressure p. 2min Adjust the inlet pressure of the main valve body of the pressure regulator to its initially set minimum inlet pressure p. 1min The flow rate Q is changed by using the flow regulating valve in the main valve body pipeline, and is gradually increased to the maximum test flow rate Q. L Then gradually reduce it to zero, record the outlet pressure and flow rate of the regulator at each measurement point, and based on the measurement point data, first draw a static characteristic curve, and then prepare a static characteristic alternative test method;

[0009] (A2) Change the connection of the controller to the alternative test state, with the lowest inlet pressure p 1min The supply controller adjusts the outlet pressure p2 to the initially set minimum outlet pressure p. 2min Flow coefficient tests were conducted on the pressure regulator at different opening degrees, and the results were recorded for the main valve body of the pressure regulator at a specified pressure p. 1，s Download traffic Q v The maximum flow rate is Q. max The regulator flow coefficient C at 20%, 40%, 60%, 80%, and 100% of the value g ;

[0010] (A3) The connection of the pilot valve is in the alternative test state, and the main valve body of the pressure regulator is at the specified pressure p. 1，s Below, with inlet pressure p 1min p 1av p 1max The supply controller adjusts the outlet pressure p2 to the initial outlet pressure p. 2min p2int p 2max In each pilot control state, the opening of the micro-flow regulating valve in the pilot control pipeline is changed to adjust the flow rate Q. v Q max 20%, 40%, 60%, 80%, and 100%, and record the outlet pressure p2 in the pressure tapping chamber in sequence;

[0011] (A4) Based on the outlet pressure p2 and flow rate Q during each test process v and flow coefficient C g Plot the curves, extrapolate the operating flow rate Q under field conditions, and evaluate the static characteristic curve results.

[0012] Preferably, the air storage tank is a horizontally placed cylindrical sealed tank structure, with an interface installed at the rear for connection to the main valve body control pipeline and pressure control pipeline.

[0013] Preferably, a shut-off valve, a flow meter, a pressure transmitter, and a temperature transmitter are installed on the main valve body control pipeline in front of the main valve body pipeline pressure control device.

[0014] Preferably, a pressure transmitter and a temperature transmitter are installed on the main valve body control pipeline connecting the main valve body of the pressure regulator under test.

[0015] Preferably, a pneumatic proportional regulating valve is installed on the pressure control pipeline and connected to the pressure control device of the main valve body pipeline.

[0016] Preferably, the high-pressure gas supply device is a nitrogen or air cylinder with a storage pressure of 4.0MPa to 20.0MPa and a cylinder valve.

[0017] Preferably, the flow control device for the pilot line consists of a high-precision voltage regulator and a micro-flow regulating valve, with the high-precision voltage regulator connected to the outlet of the pilot line of the pressure regulator being tested.

[0018] Preferably, the pilot line connecting the high-pressure reducing valve, the pilot line of the pressure regulator under test, and the pilot line flow control device is equipped with a shut-off valve.

[0019] Preferably, step (A1) is performed when Q = 0 to Q L At least 11 measurement points should be distributed in the interval, namely: the initial point, 5 flow increase points, 4 flow decrease points, and 1 zero flow point.

[0020] Preferably, the specified pressure p in step (A2) 1，s Between 20 kPa and 100 kPa.

[0021] Preferably, the maximum flow rate Q in step (A2)max For a specified pressure p 1，s The flow rate when the main valve body of the pressure regulator is 100% open.

[0022] Preferably, the flow coefficient C in step (A2) g The experimental and calculation methods include:

[0023] ① With the main valve body of the pressure regulator open, select at least n (n≥3) equivalent values ​​for the inlet pressure of the main valve body within the range of 20kPa to 100kPa. With the outlet regulating valve fully open, measure and record the flow rate Qv, the medium temperature t1 upstream of the main valve body, the inlet pressure p1, and the atmospheric pressure p. a The pressure difference ratios x and YC are calculated according to formulas (1) and (2).

[0024]

[0025]

[0026] ② Plot the test points on a rectangular coordinate system with the pressure difference ratio x as the abscissa and YC as the ordinate. Fit the test points using a linear equation. When x is 0 on the fitted line, Y equals 1. At this point, YC is the flow capacity coefficient C, thus obtaining the flow capacity coefficient C of the pressure regulator sample under test. The critical pressure difference ratio x can be obtained from the abscissa when YC is 0.667C. t Calculate K1 according to formula (3).

[0027]

[0028] ③ Using the n (n≥3) sets of data obtained from the test and the K1 value, calculate C according to formula (4). g，i (i = 1, 2, ..., n), calculate the flow coefficient C according to formula (5). g ,

[0029]

[0030]

[0031] Preferably, the extrapolation calculation method for the operating flow rate Q under the field usage conditions in step (A4) includes:

[0032] ① When the pressure difference ratio x between the inlet and outlet of the main valve body of the pressure regulator is not less than 8100 / K1 2 At that time, its flow rate Q is calculated according to formula (6).

[0033]

[0034] ② When the pressure difference ratio x between the inlet and outlet of the main valve body of the pressure regulator is less than 8100 / K12 When the flow rate Q is Q, the formula for calculating it is shown in equation (7).

[0035]

[0036] Preferably, the method for drawing the static characteristic curve in step (A4) includes:

[0037] ① For any given p2 value, its flow rate Q v The test results with outlet pressure p2 are plotted on Q. v - on the p2 coordinate graph;

[0038] ②Transfer the flow Q v With flow coefficient C g The experimental results are plotted on Q. v -C g On the coordinate graph;

[0039] ③ Calculate the flow rate Q at the corresponding pressure, and compare the flow rate Q with the flow coefficient C. g The calculation results are plotted on Q-C g On the coordinate graph;

[0040] ④ Plot the flow rate Q against the outlet pressure p2 on a Q-p2 coordinate graph.

[0041] Preferably, the evaluation method for the static characteristic curve results in step (A4) includes:

[0042] ① Compare the calculation results of the alternative test state with the test results of the normal working state. If the absolute deviation of the outlet pressure is less than or equal to 20% AC, then all the results calculated by this method are acceptable. If not, the results of this method should not be used.

[0043] ②Static results are based on test results under normal operating conditions.

[0044] This invention obtains the flow rate of the main valve body of the pressure regulator at different opening degrees under a specified pressure by using a substitute test connection state of the pressure regulator's controller. It also completes flow coefficient tests for different opening degrees, and uses the data of outlet pressure, flow rate, and flow coefficient from each test process to plot curves. By extrapolating the operating flow rate under field conditions, the static characteristic curve results are evaluated. This method requires only a small amount of gas under test conditions to obtain the static characteristics of large-diameter, high-pressure indirect-acting pressure regulators, saving significant gas costs and offering good operability. Compared with traditional pressure regulator static characteristic testing methods, it not only reduces the amount of gas used in the test and lowers the requirements for laboratory gas storage capacity, but also avoids the problem of incomplete pressure regulator evaluation caused by the lack of high-pressure, high-flow-rate testing environments in China. Furthermore, the static characteristic results processed by this method are intuitively visible. Attached image description:

[0045] Figure 1 A schematic diagram of the test apparatus used for the alternative test method of static characteristics of an indirect-acting voltage regulator;

[0046] Figure 2 This is a graph showing the relationship between the differential pressure ratio x and YC.

[0047] Figure 3 For traffic Q v With flow coefficient C g Relationship diagram;

[0048] Figure 4 For traffic Q v Relationship between export pressure p2 and output pressure p2;

[0049] Figure 5 For the flow coefficient C g Relationship diagram with operating flow rate Q;

[0050] Figure 6 This represents the relationship between the operating flow rate Q and the outlet pressure p2.

[0051] Wherein: 1-Compressor unit; 2-Air storage tank; 3-Pressure transmitter; 4-Temperature transmitter; 5-Flow meter; 6-Main valve body pipeline pressure control device; 7-Pressure transmitter; 8-Temperature transmitter; 9-Main valve body of the pressure regulator under test; 10-Pressure transmitter; 11-Main valve body pipeline flow regulating valve; 12-Pneumatic proportional regulating valve; 13-Command device of the pressure regulator under test; 14-High-pressure air supply cylinder; 15-High-pressure pressure reducing valve; 16-High-precision pressure stabilizer; 17-Micro-flow regulating valve; V1-Stop valve; V2-Stop valve; V3-Stop valve; V4-Stop valve; V5-Stop valve. Detailed implementation method:

[0052] See Figure 1 The test apparatus used in the indirect-acting pressure regulator static characteristic substitution test method provided by the present invention includes a gas supply device for providing test gas source for the main valve body of the pressure regulator and power gas source for the pneumatic valve, a high-pressure gas cylinder for providing test gas source for the pressure regulator controller, a main valve body control pipeline, a pressure control pipeline and a controller pipeline.

[0053] The air supply device consists of a compressor unit 1 and an air storage tank 2. The air storage tank is a horizontally placed cylindrical sealed tank structure. The compressor unit pumps compressed air into the air storage tank and maintains a constant pressure inside the tank. An interface for connecting to the main valve body control pipeline and pressure control pipeline is installed at its rear. The air supply device provides the air source for the main valve body during the testing process and provides pressure signals to the main valve body pipeline pressure control device.

[0054] The outlet of the air storage tank is connected to the main valve body test pipeline and the pressure control pipeline respectively. The main valve body control pipeline is sequentially equipped with a shut-off valve V1, a pressure transmitter 3, a temperature transmitter 4, a flow meter 5, a main valve body pipeline pressure control device 6, a pressure transmitter 7, a temperature transmitter 8, the main valve body of the pressure regulator under test 9, and a main valve body pipeline flow regulating valve 11.

[0055] A pneumatic proportional regulating valve 12 is installed on the pressure control pipeline and connected to the main valve body pipeline pressure control device 6 to provide a regulating air source. The opening of the pneumatic proportional regulating valve is adjusted to reduce the pipeline pressure to the pressure required for testing, thereby changing the pressure in the main valve body pipeline.

[0056] The outlet of the high-pressure gas cylinder 14 is connected in sequence to the high-pressure reducing valve 15, the pressure regulator under test 13, and the flow control device of the pressure regulator pipeline via a pilot pipeline. Shut-off valves V2-V5 are installed on the connected pilot pipeline. The flow control device of the pilot pipeline consists of a high-precision pressure regulator 16 and a micro-flow regulating valve 17. The high-precision pressure regulator 16 is connected to the outlet of the pressure regulator under test 13. Adjusting the opening of the micro-flow regulating valve changes the flow rate in the pilot pipeline. The high-pressure gas cylinder is a nitrogen or air cylinder with a storage pressure of 4.0 MPa to 20.0 MPa and a cylinder valve.

[0057] The present invention utilizes the indirect-acting voltage regulator static characteristic replacement test method provided by the above-mentioned testing device, and includes the following steps:

[0058] (A1) With the controller connected in normal operating condition, set the outlet pressure of the pressure regulator under test to its initial minimum outlet pressure p. 2min Adjust the inlet pressure of the main valve body of the pressure regulator to its initially set minimum inlet pressure p. 1min The flow rate Q is changed by using the flow regulating valve in the main valve body pipeline, and is gradually increased to the maximum test flow rate Q. L Then gradually reduce it to zero, in the range of Q = 0 to Q L At least 11 measurement points should be distributed throughout the test area, namely: an initial point, 5 flow increase points, 4 flow decrease points, and 1 zero flow point. Record the outlet pressure and flow rate of the regulator at each measurement point. Based on the measurement point data, first plot a static characteristic curve, and then prepare alternative static characteristic test methods.

[0059] (A2) Change the connection of the controller to the alternative test state, with the lowest inlet pressure p 1min The supply controller adjusts the outlet pressure p2 to the initially set minimum outlet pressure p. 2min Flow coefficient tests were conducted on the pressure regulator at different opening degrees, and the results were recorded for the main valve body of the pressure regulator at a specified pressure p. 1，s Download traffic Q v The maximum flow rate is Q.max The regulator flow coefficient C at 20%, 40%, 60%, 80%, and 100% of the value g ;

[0060] The maximum flow rate Q max For a specified pressure p 1，s The flow rate when the main valve body of the pressure regulator is 100% open;

[0061] The specified pressure p 1，s Between 20 kPa and 100 kPa;

[0062] The flow coefficient C g The experimental and calculation methods include:

[0063] ① With the main valve body of the pressure regulator open, select at least n (n≥3) equivalent values ​​for the inlet pressure of the main valve body within the range of 20kPa to 100kPa. With the outlet regulating valve fully open, measure and record the flow rate Qv, the medium temperature t1 upstream of the main valve body, the inlet pressure p1, and the atmospheric pressure p. a The pressure difference ratios x and YC are calculated according to formulas (1) and (2).

[0064]

[0065]

[0066] ② Plot the test points on a rectangular coordinate system with the pressure difference ratio x as the abscissa and YC as the ordinate. Fit the test points using a linear equation. When x is 0 on the fitted line, Y equals 1. At this point, YC is the flow capacity coefficient C, thus obtaining the flow capacity coefficient C of the pressure regulator sample under test. The critical pressure difference ratio x can be obtained from the abscissa when YC is 0.667C. t Calculate K1 according to formula (3).

[0067]

[0068] ③ Using the n (n≥3) sets of data obtained from the test and the K1 value, calculate C according to formula (4). g，i (i = 1, 2, ..., n), calculate the flow coefficient C according to formula (5). g ,

[0069]

[0070]

[0071] (A3) The connection of the pilot valve is in the alternative test state, and the main valve body of the pressure regulator is at the specified pressure p. 1，s Below, with inlet pressure p 1min p1av p 1max The supply controller adjusts the outlet pressure p2 to p 2min p 2int p 2max In each pilot control state, the opening of the micro-flow regulating valve in the pilot control pipeline is changed to adjust the flow rate Q. v Q max The opening intervals are 20%, 40%, 60%, 80%, 100% or smaller, and the outlet pressure p2 in the pressure tapping chamber is recorded sequentially.

[0072] (A4) Based on the outlet pressure p2 and flow rate Q during each test process v and flow coefficient C g Plot the curves, extrapolate the operating flow rate Q under field conditions, and evaluate the static characteristic curve results.

[0073] The extrapolation calculation method for the operating flow rate Q under the aforementioned field usage conditions includes:

[0074] ① When the pressure difference ratio x between the inlet and outlet of the main valve body of the pressure regulator is not less than 8100 / K1 2 At that time, its flow rate Q is calculated according to formula (6).

[0075]

[0076] ② When the pressure difference ratio x between the inlet and outlet of the main valve body of the pressure regulator is less than 8100 / K1 2 When the flow rate Q is Q, the formula for calculating it is shown in equation (7).

[0077]

[0078] The method for plotting the static characteristic curve includes:

[0079] ① For any given p2 value, its flow rate Q v The test results with outlet pressure p2 are plotted on Q. v - on the p2 coordinate graph;

[0080] ②Transfer the flow Q v With flow coefficient C g The experimental results are plotted on Q. v -C g On the coordinate graph;

[0081] ③ Calculate the flow rate Q at the corresponding pressure, and compare the flow rate Q with the flow coefficient C. g The calculation results are plotted on Q-C g On the coordinate graph;

[0082] ④ Plot the flow rate Q against the outlet pressure p2 on a Q-p2 coordinate graph.

[0083] The evaluation methods for the static characteristic curve results include:

[0084] ① Compare the calculation results of the alternative test state with the test results of the normal working state. If the absolute deviation of the outlet pressure is less than or equal to 20% AC, then all the results calculated by this method are acceptable. If not, the results of this method should not be used.

[0085] ②Static results are based on test results under normal operating conditions.

[0086] The method for changing the connection status of the controller of the present invention includes:

[0087] (B1) The regulator's pilot valve has at least one port that connects to the regulator's inlet side pipeline and one port that obtains the regulator's outlet pressure.

[0088] (B2) The normal working state of the controller connection is one of the states when the voltage regulator is working normally on site.

[0089] (B3) The alternative test state for the connection of the controller is the connection state of the controller when the test method is used. In this state, the inlet port of the controller is connected to a high-pressure gas supply device and a high-pressure pressure reducing valve that are independent of the main valve body pipeline, and the outlet port of the controller is connected to the flow control device of the controller pipeline.

[0090] (B4) The flow regulating valve in the main valve body of the pressure regulator is 100% open.

[0091] In one embodiment of the present invention, the static characteristic test of the voltage regulator is performed according to the above method:

[0092] Step 1: With the controller in normal working condition, i.e., shut-off valves V1, V2 and V3 are open and shut-off valves V4 and V5 are closed, adjust the inlet pressure of the main valve body of the pressure regulator and the controller to 500 kPa. By adjusting the opening degree of the flow regulating valve of the main valve body, test the static characteristic data of the pressure regulator at 5 different opening degrees.

[0093] Table 1. Measured static characteristic data of the voltage regulator

[0094]

[0095] Step 2: Connect the pilot valve to the alternative test state, i.e., open shut-off valves V1, V4, and V5, close shut-off valves V2 and V3, and supply the pilot valve with a pressure of 500 kPa at the main valve body of the pressure regulator under the specified pressure of 50 kPa. Record the maximum flow rate Q of the pressure regulator. max 320m 3 / h.

[0096] Step 3: Change the opening of the micro-flow regulating valve in the pilot line so that the flow rate Q v Q max 20% (64m) 3 / h), under this condition, five pressures within the range of 20-100 kPa are selected to supply pressure to the main valve body of the pressure regulator. The flow rate Qv, the medium temperature t1 upstream of the main valve body, the inlet pressure p1, and the atmospheric pressure p are measured and recorded. a And calculate x and YC.

[0097] Table 2. Test results under alternative test conditions

[0098]

[0099] Step 4: Perform linear fitting on x and YC to obtain x t And calculate K1.

[0100]

[0101] Step 5: Using the 5 sets of test data and the K1 value, calculate C according to formula (4). g，i (i = 1, 2, ..., 5), calculate the flow coefficient C according to formula (5). g .

[0102] Table 3 Calculation results of flow coefficient Cg

[0103]

[0104] Step 6: Calculate the flow rate Q sequentially, following steps 3 through 5. v Q max Flow coefficients C at 40%, 60%, 80%, and 100% g And drawn on Q v -C g In the coordinate graph.

[0105] Step 7: The pilot valve is connected in the alternative test state. The main valve body of the pressure regulator supplies the pilot valve with a pressure of 500 kPa at the specified pressure of 50 kPa. Change the opening of the micro-flow regulating valve in the pilot valve pipeline so that the flow rate Q v Q max The pressure is measured at 20%, 40%, 60%, 80%, and 100%, and the outlet pressure p2 in the pressure tapping chamber is recorded sequentially and plotted on Q. v -p2 coordinate graph.

[0106] Step 8: Calculate the operating flow rate Q of the main valve body of the pressure regulator at a pressure of 500 kPa under different opening degrees according to the flow coefficient formula, and plot it on C. g -Q coordinate graph.

[0107] Step 9: Plot the flow rate Q against the outlet pressure p2 on the Q-p2 coordinate graph.

[0108] Step 10: The absolute deviation of the outlet pressure is at most 0.4% and less than or equal to 1% (AC = 0.5%, 20% AC = 1%). The result is acceptable.

[0109] The above embodiments are merely illustrative of the technical concept of the present invention and should not be construed as limiting the scope of protection of the present invention. Any modifications made to the technical solutions based on the technical concept proposed in this invention shall fall within the scope of protection of this invention.

Claims

1. A test method based on a substitute test device for the static characteristics of an indirect-acting voltage regulator, characterized in that: This test method is applicable to a static characteristic substitution test device for indirect-acting pressure regulators. The device includes a gas supply unit providing test gas for the main valve body and pneumatic valve, a high-pressure gas supply unit providing test gas for the regulator's pilot valve, a main valve body control pipeline, a pressure control pipeline, and a pilot valve pipeline. The gas supply unit consists of a compressor unit and an air storage tank. The outlet of the air storage tank is connected to the main valve body test pipeline and the pressure control pipeline, respectively. The main valve body control pipeline is sequentially equipped with a main valve body pipeline pressure control device, the main valve body of the pressure regulator under test, and a main valve body pipeline flow regulating valve. The pressure control pipeline is connected to the main valve body pipeline pressure control device to provide it with regulating gas. The outlet of the high-pressure gas supply unit is sequentially connected to a high-pressure reducing valve, the pilot valve of the pressure regulator under test, and a pilot valve pipeline flow control device via a pilot valve pipeline. The test method based on this device includes the following steps: (A1) With the controller connected in normal operating condition, set the outlet pressure of the pressure regulator under test to its initial minimum outlet pressure. p 2min Adjust the inlet pressure of the main valve body of the pressure regulator to its initial minimum inlet pressure. p 1min The flow rate is changed by using the flow regulating valve in the main valve body pipeline. Q First, gradually increase to the maximum test flow rate. Q L Then gradually reduce it to zero, record the outlet pressure and flow rate of the regulator at each measurement point, and based on the measurement point data, first draw a static characteristic curve, and then prepare a static characteristic alternative test method; (A2) Change the connection of the controller to the alternative test state, with the lowest inlet pressure. p 1min Supply command system to control export pressure p 2. Adjust to the initial minimum export pressure. p 2min Flow coefficient tests were conducted on the pressure regulator at different opening degrees, and the results were recorded for the main valve body of the pressure regulator at a specified pressure. p 1，s Download traffic Q v The maximum flow rate is respectively Q max The regulator flow coefficient at 20%, 40%, 60%, 80%, and 100% C g ; (A3) The connection of the pilot valve is in the alternative test state, and the main valve body of the pressure regulator is at the specified pressure. p 1，s Below, based on inlet pressure p 1min , p 1av , p 1max Supply command system to control export pressure p 2. Adjust to the initial export pressure respectively p 2min , p 2int , p 2max In each pilot control state, the opening of the micro-flow regulating valve in the pilot control pipeline is changed to adjust the flow rate. Q v In order Q max The pressure is increased to 20%, 40%, 60%, 80%, and 100%, and the outlet pressure in the pressure tapping chamber is recorded sequentially. p 2; (A4) Based on the outlet pressure during each test process p 2. Traffic Q v and flow coefficient C g Plot the curve and extrapolate the operating flow rate under actual field conditions. Q And complete the evaluation of the static characteristic curve results.

2. The test method based on the indirect-acting voltage regulator static characteristic substitution test device according to claim 1, characterized in that: The air storage tank is a horizontally placed cylindrical sealed tank structure, with an interface installed at the rear for connection to the main valve body control pipeline and pressure control pipeline.

3. The test method based on the indirect-acting voltage regulator static characteristic substitution test device according to claim 1, characterized in that: The main valve body control pipeline is equipped with a shut-off valve, flow meter, pressure transmitter, and temperature transmitter located in front of the main valve body pipeline pressure control device.

4. The test method based on the indirect-acting voltage regulator static characteristic substitution test device according to claim 1, characterized in that: A pressure transmitter and a temperature transmitter are installed on the main valve body control pipeline connecting the main valve body pressure control device and the main valve body of the pressure regulator under test.

5. The test method based on the indirect-acting voltage regulator static characteristic substitution test device according to claim 1, characterized in that: A pneumatic proportional regulating valve is installed on the pressure control pipeline and connected to the pressure control device of the main valve body pipeline.

6. The test method based on the static characteristic substitution test device of an indirect-acting voltage regulator according to claim 1, characterized in that: The high-pressure gas supply device is a nitrogen or air cylinder with a storage pressure of 4.0MPa to 20.0MPa and a cylinder valve.

7. The test method based on the static characteristic substitution test device of an indirect-acting voltage regulator according to claim 1, characterized in that: The flow control device for the pilot line consists of a high-precision voltage regulator and a micro-flow regulating valve. The high-precision voltage regulator is connected to the outlet of the pilot line of the pressure regulator being tested.

8. The test method based on the indirect-acting voltage regulator static characteristic substitution test device according to claim 1, characterized in that: The valve is installed in the pilot line connecting the high pressure reducing valve, the pilot line of the pressure regulator under test, and the pilot line flow control device.

9. The test method based on the indirect-acting voltage regulator static characteristic substitution test device according to claim 1, characterized in that: The step (A1) is in Q =0~ Q L At least 11 measurement points should be distributed throughout the area, namely: the initial point, 5 flow increase points, 4 flow decrease points, and 1 zero flow point.

10. The test method based on the indirect-acting voltage regulator static characteristic substitution test device according to claim 1, characterized in that: The specified pressure in step (A2) p 1，s Between 20 kPa and 100 kPa.

11. The test method based on the static characteristic substitution test device of an indirect-acting voltage regulator according to claim 1, characterized in that: The maximum flow rate mentioned in step (A2) Q max For specified pressure p 1，s The flow rate when the main valve body of the pressure regulator is 100% open.

12. The test method based on the indirect-acting voltage regulator static characteristic substitution test device according to claim 1, characterized in that: The flow coefficient in step (A2) C g The experimental and calculation methods include: ① With the main valve body of the pressure regulator at the specified opening degree, select the minimum pressure within the range of 20kPa to 100kPa for the inlet pressure of the main valve body of the pressure regulator. n (n≥3) Equivalent values ​​are taken, the outlet regulating valve is fully open, and the flow rate is measured and recorded respectively. Q v. Temperature of the medium upstream of the main valve body t 1. Import pressure p 1 and atmospheric pressure p a The pressure difference ratio is calculated according to formulas (1) and (2). x and YC (1) (2) ② Plot the test points on the basis of pressure difference ratio x The x-axis is... YC On a rectangular coordinate system with ordinate as the ordinate, a linear equation is used to fit the test points, and the fitted line... x At 0, Y It equals 1 at this time. YC That is, the circulation capacity coefficient. C This allows us to obtain the flow capacity coefficient of the tested voltage regulator sample. C ,from YC It is 0.667 C The critical pressure differential ratio can be obtained from the x-axis of the time. x t Calculate according to formula (3) K 1, (3) ③Use the results of the test n ( n ≥3) sets of data and K 1. Calculate according to formula (4). C g，i ( i =1, 2, ... n ), calculate the flow coefficient according to formula (5) C g , (4) (5)。 13. The test method based on the indirect-acting voltage regulator static characteristic substitution test device according to claim 1, characterized in that: The operating flow rate under the field usage conditions described in step (A4) Q Extrapolation calculation methods include: ① When the pressure difference between the inlet and outlet of the main valve body of the pressure regulator is... x Meets the requirement of not less than 8100 / K 1 2 At that time, its flow rate Q Calculate according to formula (6), (6) ② When the pressure difference between the inlet and outlet of the main valve body of the pressure regulator is... x Less than 8100 / K 1 2 At that time, its flow rate Q The calculation formula is shown in equation (7). (7)。 14. The test method based on the indirect-acting voltage regulator static characteristic substitution test device according to claim 1, characterized in that: The method for drawing the static characteristic curve in step (A4) includes: ①For any p 2. Set the value to control its flow rate. Q v Export pressure p The experimental results of 2 are plotted on Q v - p On a 2-axis graph; ②Transfer traffic Q v With flow coefficient C g The experimental results are drawn on Q v - C g On the coordinate graph; ③ Calculate the flow rate at the corresponding pressure. Q , will traffic Q With flow coefficient C g The calculation results are plotted on Q - C g On the coordinate graph; ④ Traffic Q Export pressure p The result of 2 is plotted on Q - p On a 2-axis graph.

15. The test method based on the indirect-acting voltage regulator static characteristic substitution test device according to claim 1, characterized in that: The evaluation method for the static characteristic curve results in step (A4) includes: ① Compare the calculation results of the alternative test state with the test results of the normal working state. If the absolute deviation of the outlet pressure is less than or equal to 20% AC, then all the results calculated by this method are acceptable. If not, the results of this method should not be used. ②Static results are based on test results under normal operating conditions.

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