CN112856019A - Testing device and method for detecting hydraulic tightness and flow characteristics of electromagnetic valve - Google Patents
Testing device and method for detecting hydraulic tightness and flow characteristics of electromagnetic valve Download PDFInfo
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- CN112856019A CN112856019A CN202011641755.1A CN202011641755A CN112856019A CN 112856019 A CN112856019 A CN 112856019A CN 202011641755 A CN202011641755 A CN 202011641755A CN 112856019 A CN112856019 A CN 112856019A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K31/00—Actuating devices; Operating means; Releasing devices
- F16K31/02—Actuating devices; Operating means; Releasing devices electric; magnetic
- F16K31/06—Actuating devices; Operating means; Releasing devices electric; magnetic using a magnet, e.g. diaphragm valves, cutting off by means of a liquid
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K37/00—Special means in or on valves or other cut-off apparatus for indicating or recording operation thereof, or for enabling an alarm to be given
- F16K37/0075—For recording or indicating the functioning of a valve in combination with test equipment
- F16K37/0091—For recording or indicating the functioning of a valve in combination with test equipment by measuring fluid parameters
Abstract
The invention discloses a testing device and a method for detecting hydraulic tightness and flow characteristics of a solenoid valve, wherein the testing device comprises the following steps: pressing the electromagnetic valve to be tested into the valve block and connecting the electromagnetic valve to be tested with a testing device; after an oil path between an oil inlet and an oil outlet of the valve block is ensured to be in a disconnected state, high-pressure liquid is provided for the valve block, after the pressure difference between two ends of the valve block is stable, excitation current is applied to a coil of the electromagnetic valve, and the flow data of the electromagnetic valve is collected through a flowmeter; processing flow data to obtain a flow value of the electromagnetic valve under a certain pressure difference; and repeating the test at intervals of 10bar to obtain stable flow values of the electromagnetic valve under different pressure differences, and fitting the test data through Matlab to obtain an electromagnetic valve flow-pressure difference characteristic curve. The invention can accurately measure the sealing performance and flow characteristic of the electromagnetic valve, and is suitable for testing the sealing performance and flow characteristic of the hydraulic electromagnetic valve.
Description
Technical Field
The invention relates to the field of mechanical part detection, in particular to a device and a method for detecting hydraulic tightness and flow characteristics of an electromagnetic valve.
Background
The electromagnetic valve is an industrial device controlled by electromagnetism, is an automatic basic element for controlling fluid, belongs to an actuator, and is not limited to hydraulic pressure and pneumatic pressure. Used in industrial control systems to regulate the direction, flow, velocity and other parameters of a medium. The solenoid valve can be matched with different circuits to realize expected control, and the control precision and flexibility can be ensured. There are many types of solenoid valves, with different solenoid valves functioning at different locations in the control system.
The sealing performance of the electromagnetic valve is important for the system, the degree of pressure maintaining capacity of the system or the working safety of the system is determined by the quality of the sealing performance of the electromagnetic valve, the sealing performance of different electromagnetic valves at high pressure and low pressure is different, and generally speaking, the sealing performance of the electromagnetic valve at the low pressure state is smaller than that at the high pressure state. The flow characteristic of the electromagnetic valve mainly depends on the structural characteristic of the electromagnetic valve and the pressure environment, and whether the flow characteristic can meet the requirement of the whole system can be understood by testing the relation curve of the flow and the pressure difference of the electromagnetic valve. Therefore, the testing of the sealing performance and the flow characteristic of the electromagnetic valve is necessary.
Disclosure of Invention
The invention considers that the flow-pressure difference characteristic curve of the electromagnetic valve is obtained by fitting the flow under different pressure differences after the structure and the working environment of the electromagnetic valve are determined, and is integrated into the flow-pressure difference characteristic test by combining the tightness test method of the electromagnetic valve, thereby simplifying the test steps and saving the test time.
The technical scheme of the invention is as follows:
the testing device for detecting hydraulic tightness and flow characteristics of the solenoid valve comprises a testing valve block, the solenoid valve, a flowmeter, an oscilloscope and two pressure sensors, wherein the solenoid valve, the flowmeter, the oscilloscope and the two pressure sensors are pressed in the testing valve block,
the test valve block comprises an oil inlet and an oil outlet, two pressure sensors are respectively arranged at the oil inlet and the oil outlet, the oscilloscope is used for displaying oil inlet pressure and oil outlet pressure, the two pressure sensors are connected with the oscilloscope, and the flowmeter is arranged at the oil outlet.
Furthermore, a proportional overflow valve is fixedly arranged on the oil outlet side of the valve block, so that the stability of the outlet pressure of the oil outlet of the test valve block in the conduction process can be ensured, the fluctuation is small, and the stability of the differential pressure of the electromagnetic valve is facilitated.
Furthermore, the stop valves are fixedly arranged on the oil outlet and the oil inlet of the valve block, so that the valve block is independent of the press when the tightness of the electromagnetic valve is measured, and the influence of the press on the tightness test of the valve block is avoided.
Furthermore, check valves are fixedly arranged on the sides of the oil outlet and the oil inlet of the valve block, so that the influence of brake fluid backflow on the accuracy of the flow test of the electromagnetic valve can be avoided.
The invention also provides a test method for detecting hydraulic tightness and flow characteristics of the solenoid valve, which comprises the following steps:
disconnecting a connecting loop between an oil inlet and an oil outlet in the test valve block, and applying pressure to the test valve block;
the two pressure sensors respectively acquire the pressure at the oil inlet side and the pressure at the oil outlet side and display the pressures on an oscilloscope in real time;
after the pressure difference between the oil inlet side and the oil outlet side is stable, applying excitation current to a coil in the electromagnetic valve, connecting an oil outlet of the electromagnetic valve with an oil inlet connecting loop and conducting the oil inlet connecting loop, and acquiring flow data at the oil outlet by a flowmeter;
repeatedly applying different pressure difference values to the oil inlet side and the oil outlet side, and respectively acquiring flow data under each pressure difference value through a flowmeter;
processing all the flow data, and fitting to obtain a flow-pressure difference characteristic curve of the electromagnetic valve;
after the pressure was stabilized, the shutoff valve on the oil inlet side was closed, and the pressure drop Δ P of the solenoid valve in t minutes was measuredtSo as to measure the sealing characteristic of the electromagnetic valve.
Further, the flow data obtained each time is a square wave signal, and the flow of the electromagnetic valve is obtained by the following method:
considering that the number of square waves in an adopted period is possibly not an integer, introducing a parameter n to represent the number of rising edges and falling edges recorded in a sampling period, and if any one square wave edge is detected in one acquisition period, adding 1 to n;
when n is an even number or an odd number,
Q＝N*Vm/T
when n is 0, Q ═ QMax/T；
Wherein Q is the flow rate, QMaxThe maximum flow value of the flowmeter, T is the sampling period, N is the number of square waves in the sampling period, VmThe volume of liquid per square wave is the selected flow meter.
Further, the determination method of the period T and the number N of square waves in the period is as follows:
when n is an even number, the calculation formula is as follows:
T＝T0(This_time)-T0(Last_time)
when n is an odd number, the calculation formula is as follows:
T＝T0(This_time)Ti(Last_time)
wherein, T0(This _ time) is the time when the last square wave change is acquired in the current acquisition period, T1(This _ time) is the square wave change time T acquired in the last time of the current acquisition period0(Last _ time) is the time when the Last square wave change is acquired in the Last acquisition period, T1(Last _ time) is when the square wave acquired Last time in the Last acquisition period changes.
Further, when n is 0, Q ═ QMaxThe determination of the employed period T in/T is as follows:
recording the number of flow calculation task cycles without arriving at a rising edge by adopting a first counter, and recording the number of the flow calculation task cycles without arriving at a falling edge by adopting a second counter, wherein the value is C1;
in one sampling period, if no pulse exists, namely n is 0, 1 is added to each of C1 and C2;
when a rising edge comes, C1 is cleared, C2+1, C2+1> C1, C1 and C2 exchange numerical values, C1 is equal to C2+1 after the numerical values are exchanged, at the moment, the first counter starts to count the number of flow calculation task cycles without coming of the falling edge, and the second counter starts to count the number of flow calculation task cycles without coming of the rising edge;
after one adopting period is finished, taking the value of the first counter at the moment as a final counting value; then
T＝C1×dt。
Further, the differential pressure values ranged from A to B, and flow tests were conducted at intervals Δ x.
Further, the differential pressure values ranged from 20bar to 160bar, with flow tests performed at intervals of 10 bar.
Compared with the prior art, the invention at least has the following beneficial effects:
1) in the process of testing the flow-pressure difference characteristic of the electromagnetic valve, after the pressure is stable, the stop valve at the oil inlet is closed, and the pressure drop delta P of the electromagnetic valve within t minutes can be measuredtTherefore, the measurement of the sealing characteristic of the electromagnetic valve is realized.
2) According to the invention, the proportional overflow valve is connected at the oil inlet of the valve block, so that the pressure at the outlet can be prevented from being greatly fluctuated when the valve block is conducted in the flow test process, and the pressure difference at two ends of the valve block is stabilized.
3) According to the invention, the stop valve and the one-way valve are connected at the oil inlet and the oil outlet, so that errors in a test result caused by pressure difference or liquid backflow can be effectively avoided, and the reliability of the test performance is improved.
Drawings
FIG. 1 is a flow chart of a testing method of the present invention.
Fig. 2 is a schematic diagram of the tightness test of the solenoid valve of the present invention.
FIG. 3 is a schematic diagram of the solenoid valve flow characteristic test of the present invention.
Fig. 4 is a flow chart of the flow meter signal data processing of the present invention.
FIG. 5 is a partial cross-sectional view of a test valve block of the present invention.
FIG. 6 is a cross-sectional structural view of a solenoid valve according to the present invention.
The labels in the figure are: 1. the hydraulic machine comprises a hydraulic machine, an overflow valve, a pressure reducing valve, a pressure sensor, a test valve block and an electromagnetic valve 501, wherein the overflow valve is 2; 502 a coil; 503 oil outlet; 504 oil inlet, 6 flowmeter, 7 load part, 8 oil drum, 9 stop valve, 10 check valve.
Detailed Description
For the convenience of understanding, the following description is further provided in conjunction with the embodiments and the drawings.
The pressure source 1 adopted by the embodiment is a hydraulic machine and provides high-pressure brake fluid for the testing device; setting a load part 7 to simulate the load in the working environment of the electromagnetic valve, wherein the load part 7 is a caliper, and the load part 7 in the embodiment is an automobile brake caliper; an oil drum 8 is provided for containing and recovering brake fluid.
Referring to fig. 5 and 6, the testing apparatus for detecting hydraulic tightness and flow characteristics of a solenoid valve provided in this embodiment includes a testing valve block 5, a solenoid valve 501 press-fitted in the testing valve block 5, a flow meter 6, an oscilloscope, and two pressure sensors 4. The solenoid valve may be a normally closed solenoid valve, or other types of solenoid valves may be used. Since it is difficult for a single solenoid valve to measure its flow rate under different differential pressures, the solenoid valve needs to be press-fitted in the test valve block 5, which facilitates the connection and testing of the test device. The two pressure sensors are arranged, so that the pressure of the oil inlet side and the pressure of the oil outlet side of the test valve block can be conveniently monitored in real time.
The test valve block 5 comprises an oil inlet 504 and an oil outlet 503, the two pressure sensors 4 are respectively arranged at the oil inlet 504 and the oil outlet 503, the oscilloscope is used for displaying the pressure at the side of the oil inlet and the pressure at the side of the oil outlet, the two pressure sensors are both connected with the oscilloscope, and the flowmeter is arranged at the oil outlet 503.
In this embodiment, the oil outlet end of the hydraulic machine is communicated with the oil inlet 504, a check valve 10, a stop valve 9 and a pressure sensor 4 are arranged between the oil outlet end and the oil inlet 504, and a pressure reducing valve 3 is further arranged between the oil outlet end of the hydraulic machine and the pressure sensor 4 to ensure that the supplied high-pressure oil does not exceed a preset value. A proportional overflow valve 2 is further arranged between the oil drum and the oil inlet 504 to provide stable high-pressure oil for the test valve, so that test errors caused by unstable pressure provided by the hydraulic machine are avoided.
In this embodiment, a check valve, a stop valve, a pressure sensor and a flow meter 6 are also arranged between the oil outlet 503 of the test valve block 5 and the oil drum. The load member 7 is provided on the oil outlet port 503 side to provide a load.
The embodiment is suitable for the research on the flow characteristics of two gas-liquid media, and the proportional overflow valve 2 and the pressure reducing valve 3 are connected between the pressure source and the test piece, so that the unstable gas supply condition of the pressure source can be effectively avoided, and the precision of the test is improved.
The embodiment also provides a test method adopting the test device.
The flow characteristic of the electromagnetic valve is measured by the formula
Wherein C is a flow coefficient determined by the shape of the valve port, the flow state of the liquid and the property of the oil liquid; a. theTThe cross-sectional flow area of the valve port;
throttle index determined by valve port shape. When the structure and the working environment of the electromagnetic valve are certain, the flow characteristic curve of the electromagnetic valve can be subjected to simulation fitting by the flow under different pressure differences.
The test method for detecting the hydraulic tightness and the flow characteristic of the solenoid valve comprises the following steps:
step 1: before providing pressure to the test valve block, it is necessary to ensure that the connection circuit between the oil inlet 504 and the oil outlet 503 in the test valve block is in a non-conduction state, and then apply pressure to the test valve block.
Step 2: the two pressure sensors 4 respectively collect the pressure at the oil inlet 504 side and the pressure at the oil outlet 503 side, and the pressure at the oil inlet side and the pressure at the oil outlet side are displayed in real time through an oscilloscope.
And 3, after the pressure difference between the oil inlet 504 side and the oil outlet 503 side of the valve block to be tested is stable, applying excitation current to the electromagnetic valve coil 502, conducting the oil outlet and oil inlet connecting loop, and collecting flow through the flow meter 6 on the oil outlet side.
And 4, acquiring and processing the flow data, and sampling and analyzing the transmitted square wave signals.
Considering that the number of the square waves in the sampling period may not be an integer, a parameter n is introduced to represent the number of the rising edges and the falling edges recorded in one sampling period, and if any one square wave edge is detected in one acquisition period, n is added by 1.
When n is even or odd, the flow rate is calculated in the manner of
Q＝N*Vm/T
Wherein T is a sampling period which is generally set to be 2-5 ms; n is the number of square waves in the sampling period, VmThe volume of liquid per square wave is the selected flow meter.
When N is an even number, the determination method of the period T and the number N of the square waves in the period is as follows:
T＝T0(This_time)-T0(Last_time)
when N is an odd number, the determination mode of the adopted period T and the number N of the square waves in the adopted period is as follows:
T＝T0(This_time)Ti(Last_time)
wherein, T0(This _ time) is the time when the last square wave change is acquired in the current acquisition period, T1(This _ time) is the square wave change time T acquired in the last time of the current acquisition period0(Last _ time) is the time when the Last square wave change is acquired in the Last acquisition period, T1(Last _ time) is when the square wave acquired Last time in the Last acquisition period changes.
When n is 0, an estimation method is adopted to obtain the flow.
If no square wave edge exists in a sampling period, the whole single-tooth-circle period can be captured only by determining the number of flow calculation task periods, and the evaluation can be carried out by utilizing two counters. The two counters are defined as a first counter and a second counter respectively. Recording the number of flow calculation task cycles without arriving at a rising edge by adopting a first counter, wherein the numerical value is C1, recording the number of flow calculation task cycles without arriving at a falling edge by adopting a second counter, and marking the numerical value as C2;
the first counter and the second counter exist in a mathematical model built in the matlab platform, counting objects are not explicitly specified by the first counter and the second counter, and for convenience of understanding, it is assumed that the first counter counts the number of flow calculation task cycles without arriving at the rising edge and the second counter counts the number of flow calculation task cycles without arriving at the falling edge at the beginning.
The first counter and the second counter count as follows:
C1/C2 clear: if two or more pulses exist in one period, C1/C2 is cleared;
2. in one sampling period, if no pulse exists, namely n is 0, 1 is added to each of C1 and C2;
3. when a rising edge arrives, C1 is cleared, C2+1, C2+1> C1, then C1 and C2 exchange numerical values, and C1 is equal to C2+1 after the numerical values are exchanged, at this time, the C1 counter starts to count the flow calculation task cycles without arriving at the falling edge, and the second counter starts to count the flow calculation task cycles without arriving at the rising edge, so that the C1 is always greater than the C2, therefore, the C1 value is always taken, and therefore, the C1 flow calculation task cycles can capture a single-tooth-circle cycle which tends to be complete but is actually not complete.
4. And by analogy, taking C1 as the final counting value
After the counting result C1 is obtained, the period of the single gear ring is the product of the sampling time dt (in this embodiment, the value is 0.005s) of the application layer and the duty cycle number C1 of the flow calculation, the time taken by n gear rings is T ═ C1 × dt, and the estimated flow Q ═ QMax/T＝QMax/(C1×dt),QMaxThe maximum flow value of the flowmeter.
Because the single-tooth ring period obtained by using the counting method is an estimated value and is always smaller than the actual single-tooth ring period, the obtained estimated flow rate is larger than the actual flow rate. If the obtained flow is larger than the flow Q of the last periodLast_timeThe flow rate in the previous period is taken as the standard; and if the obtained flow is less than or equal to the flow in the previous period, estimating the flow as the flow in the period.
Wherein, the flow data is realized on a Matlab simulation platform, and a stable value is obtained, and a flow chart of the flow data is shown in fig. 4.
And 5, repeating the steps, applying different pressure difference values to two ends of the oil inlet 504 side and the oil outlet 503 side of the test valve block, and respectively recording flow data under each pressure difference value.
In this embodiment, the range of the differential pressure value is 20bar to 160bar, the flow rate test is performed at an interval of 10bar, and 15 sets of differential pressure and flow rate data are recorded.
And 6, introducing the 15 groups of data into Matlab, and fitting by using a power function in the Matlab to obtain a flow-pressure difference characteristic curve of the electromagnetic valve.
Step 7, after the pressure is stable, closing a stop valve at the side of the oil inlet 504, and measuring the pressure drop delta P of the electromagnetic valve within t minutestSo as to measure the sealing characteristic of the electromagnetic valve.
The smaller the pressure drop is, the better the sealing property of the electromagnetic valve is, and if the pressure drop exceeds a standard value within t minutes, the sealing property of the electromagnetic valve does not reach the standard, and the electromagnetic valve is used as waste. The quality of the pressure maintaining performance of the whole system can be evaluated by measuring the sealing characteristic of the electromagnetic valve.
It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.
Claims (10)
1. Detect solenoid valve hydraulic pressure leakproofness and flow characteristic's testing arrangement, its characterized in that: comprises a test valve block (5), an electromagnetic valve (501) pressed in the test valve block (5), a flowmeter, an oscilloscope and two pressure sensors,
the test valve block (5) comprises an oil inlet (504) and an oil outlet (503), two pressure sensors are arranged at the oil inlet (504) and the oil outlet (503) respectively, the oscilloscope is used for displaying the pressure at the side of the oil inlet and the pressure at the side of the oil outlet, the two pressure sensors are connected with the oscilloscope, and the flowmeter is arranged at the oil outlet (503).
2. The test device for detecting the hydraulic tightness and the flow characteristics of the electromagnetic valve according to claim 1, characterized in that: and stop valves (9) are fixedly arranged on the oil inlet (504) and the oil outlet (503) sides.
3. The test device for detecting the hydraulic tightness and the flow characteristics of the electromagnetic valve according to claim 1, characterized in that: and one-way valves (10) are fixedly arranged on the sides of the oil inlet (504) and the oil outlet (503).
4. The test device for detecting the hydraulic tightness and the flow characteristics of the electromagnetic valve according to any one of claims 1 to 3, characterized in that: and a proportional overflow valve (2) is fixedly arranged at the oil outlet (503) side.
5. A test method for detecting hydraulic tightness and flow characteristics of a solenoid valve, which is characterized in that the test device of any one of claims 1 to 4 is used for testing, and comprises the following steps:
disconnecting a connecting loop between an oil inlet (504) and an oil outlet (503) in the test valve block (5), and applying pressure to the test valve block (5);
the two pressure sensors (4) respectively acquire the pressure at the side of the oil inlet (504) and the pressure at the side of the oil outlet (503), and display the pressure and the pressure in real time on an oscilloscope;
after the pressure difference between the oil inlet (504) side and the oil outlet (503) side is stable, applying excitation current to a coil in the electromagnetic valve (5), enabling the oil outlet and the oil inlet to be connected with a loop and communicated, and acquiring flow data at the oil outlet (503) by a flowmeter;
different pressure difference values are repeatedly applied to the oil inlet (504) side and the oil outlet (503) side, and flow data under each pressure difference value are respectively collected through a flowmeter;
processing all the flow data, and fitting to obtain a flow-pressure difference characteristic curve of the electromagnetic valve;
after the pressure has stabilized, the shut-off valve on the side of the oil inlet (504) is closed, and the pressure drop Δ P of the solenoid valve is measured over t minutestSo as to measure the sealing characteristic of the electromagnetic valve.
6. The testing method for detecting the hydraulic tightness and the flow characteristics of the solenoid valve according to claim 5, wherein the flow data obtained each time is a square wave signal, the flow of the solenoid valve is obtained by the following method:
considering that the number of square waves in an adopted period is possibly not an integer, introducing a parameter n to represent the number of rising edges and falling edges recorded in a sampling period, and if any one square wave edge is detected in one acquisition period, adding 1 to n;
when n is an even number or an odd number,
Q＝N*Vm/T
when n is 0, Q ═ QMax/T；
Wherein Q is the flow rate, QMaxThe maximum flow value of the flowmeter, T is the sampling period, N is the number of square waves in the sampling period, VmThe volume of liquid per square wave is the selected flow meter.
7. The test method for detecting the hydraulic tightness and the flow characteristics of the solenoid valve according to claim 6, wherein the determination method of the period T and the number N of the square waves in the period is as follows:
when n is an even number, the calculation formula is as follows:
T＝T0(This_time)-T0(Last_time)
when n is an odd number, the calculation formula is as follows:
T＝T0(This_time)-T1(Last_time)
wherein, T0(This _ time) is the time when the last square wave change is acquired in the current acquisition period, T1(This _ time) is the square wave change time T acquired in the last time of the current acquisition period0(Last _ time) is the time when the Last square wave change is acquired in the Last acquisition period, T1(Last _ time) is when the square wave acquired Last time in the Last acquisition period changes.
8. The test method for detecting the hydraulic tightness and the flow rate characteristic of the solenoid valve according to claim 6, wherein Q is Q when n is 0＝QMsxThe determination of the employed period T in/T is as follows:
recording the number of flow calculation task cycles without arriving at a rising edge by adopting a first counter, and recording the number of the flow calculation task cycles without arriving at a falling edge by adopting a second counter, wherein the value is C1;
in one sampling period, if no pulse exists, namely n is 0, 1 is added to each of C1 and C2;
when a rising edge comes, C1 is cleared, C2+1, C2+1 is larger than C1, then C1 and C2 exchange values, C1 is equal to C2+1 after the values are exchanged, at the moment, the first counter starts to count the number of flow calculation task cycles without coming of the falling edge, and the second counter starts to count the number of flow calculation task cycles without coming of the rising edge;
after one adopting period is finished, taking the value of the first counter at the moment as a final counting value; then
T＝C1×dt。
9. The test method for detecting the hydraulic tightness and the flow characteristics of the electromagnetic valve according to any one of claims 5 to 8, wherein the range of the differential pressure value is from A to B, and the flow test is performed at an interval Δ x.
10. The test method for detecting the hydraulic tightness and the flow characteristics of the electromagnetic valve according to any one of claim 9, wherein the pressure difference value ranges from 20bar to 160bar, and the flow test is performed at intervals of 10 bar.
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