JB/T 6725-1993 Test methods for spin-on oil filters for internal combustion engines
Some standard content:
J95
JB
Machinery Industry Standard of the People's Republic of China
JB/T6725-93
Spin-on oil filter for internal combustion engines
Test method|| tt||Released on 1993-07-29
Ministry of Machinery Industry of the People's Republic of China
Released
Implemented on 1994-01-01
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3| |tt||5
6
Subject content and scope of application
Quoted standards
Terms
Test items
Test equipment|| tt | pieces)
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times
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Machinery Industry Standard of the People's Republic of China
Spin-on oil filter for internal combustion engines
Test method
This standard refers to the international standard ISO4548 & Test method for full-flow oil filter for internal combustion engines. 1 Subject content and scope of application
JB/T6725-93
This standard specifies the test items, devices, methods and procedures for testing the performance of installed oil filters for internal combustion engines. This standard applies to spin-on oil filters for internal combustion engines with a volumetric flow rate of less than 50L/min. 2 Reference standards
GB3821 Method for determination of clarity of small and medium-power internal combustion engines 3 Terminology
3.1 Filter
When the wave body passes through, the insoluble impurities are blocked by the porous fiber layer component and An isolated device. 3.2 Oil filter
A filter that filters the liquid into engine oil.
3.3 full-flow oil filter
An oil filter that can pass the entire amount of oil required by the lubrication system. 3.4 Filter assembly
The assembly includes the filter housing, oil inlet, oil outlet and filter element. If there are special needs, filter bypass components and check valves can also be included.
3.5 spin-on simple filter
The oil filter with a replaceable assembly with an integral filter element can be directly installed into the engine's lubrication system by swirling. If necessary, The assembly can also include filter bypass components and check-back components, 3.6 filter elements
components that filter out insoluble impurities in the filter. 3.7 Filter bypass element
A component that allows unfiltered engine oil to bypass the filter element when the pressure difference in the filter reaches the specified value. 3.8 Bypass valve opening pressure
The design nominal opening pressure specified in the product drawing approved by the prescribed procedures. When the bypass is opened, the specified flow rate passes. 3.9 Check width
A component that prevents engine oil from flowing out of the filter housing when the engine is not running. 3.10 Check leakage amount
The amount of engine oil that is retained from the check valve when the simple filter is rotated and drained, expressed in mL/h. 3.11 Pressure drop △p
In the oil flow system, the static pressure difference between two specified points at any given time. 3.12 Test liquid
The liquid used in the test varies with the test content. Approved by the Ministry of Machinery Industry on 1993-07-29
Implemented on 1994-01-01
1||tt ||3.13 rated flow Q. bzxz.net
JB/T 672593
The nominal value of flow specified by the manufacturer under the specified viscosity and pressure drop, expressed in L/min. 3.14 Test flow rate Q
In the specified test, the flow rate of the test liquid through the filter is expressed in L/min. 3.15 Original resistance △P
For a filter equipped with a new filter element, the pressure difference between the inlet and outlet of the filter at rated flow rate is expressed in kPa. 3.16 Original filtration efficiency n
The ability of a filter equipped with a new filter element to filter out standard test impurities under specified test conditions in its initial working state, expressed in percentage.
3.17 Filter element clogging life t
Use the impurity test liquid with the specified concentration and filter the filter at the rated flow rate until the filter element is blocked until the pressure drops to 70% of the opening pressure of the filter bypass element. Time, expressed in h,
3.18 Internal cleanliness
The weight of impurities brought into the new filter during the manufacturing, storage and transportation process, expressed in mg. 3.19 Breakage pressure
The maximum internal liquid pressure that the filter assembly can withstand, expressed in kPa. Test project
4
Internal cleanliness test.
4.1
4.2 Pressure drop-flow characteristic test.
4.3
Characteristic test of filter element bypass element.
4.4
High pressure drop test of filter element,
4.5
High oil temperature test,
4.6
Original filtration efficiency test.
Core clogging life test.
4.7
Hydraulic pulse fatigue test.
4.8
No-return leakage test,
4.9
4.10
Static pressure damage test,
4.11||tt| |Vibration fatigue test.
Note: The test items specified in this standard provide the minimum data required to evaluate the performance of the installable oil filter. If the manufacturer and the user agree, the test can also be carried out according to the user's requirements. Make corresponding changes or proceed separately, 5 test device
5.1 Hydraulic performance test device (see Figure 1), 5.2 Original filtration efficiency test installation (see Figure 2) 5.3 Clogging life test device (see Figure 2) 3). 5.4 Hydraulic pulse fatigue test device (see Figure 4). 5.5 Non-return leakage test device (see Figure 5). 5.6 Static pressure damage test device (see Figure 6). 5.7 Alarm fatigue test device (see Figure 7), 2
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JB/T6725—93
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S|| tt | |? s | Read 4 - switch hook, 5 - flow meter, 6 - pressure difference meter (measure the pressure drop before and after the filter): 7 - pressure gauge; 8 - filter under test: 9 - lift meter: 10 - flow rate Adjustment: Note: The pipe length is specified in the unit of pipe inner diameter d. e
11-Pressure differential meter (measure the pressure drop before and after the filter element) Figure 2 Original filtration efficiency test device diagram
1-Test fluid oil slip (cover with vent hole); 2- Stirrer; 3, 6, 7 - plug switch: 4 - oil pump (dragon-action variable flow); 5 - flow meter (glass rotor type) 8 - filter in test; 9 - sample collection bottle Q8
O
M
Figure 3 Blockage life test device diagram
1-motor driven oil pump; 2-oil tank with constant control heater, 3-dye Impurity adding device; 4-flow meter,: 5-differential pressure meter: 6-pressure gauge: 7-filter in test: 8-thermometer, 9-differential pressure meter, 10-switch valve Note: Take the inner diameter of the pipe d Specifies the pipe length in units. 3
JB/T6725—93
Figure 4 Hydraulic pulse fatigue test device diagram
1-motor-driven oil pump, 2-metal pipe: 3-oil storage tank: 4-frame Thermostat: 5 - cold tube (heat exchanger); 6 - time relay and counter. Used to control electromagnetic readings 7 and 8: 7.8 - Solenoid valve: 9 - filter in test, 10 - pressure gauge; 11 -Inlet pressure control read 60mn
009
Figure 5 Check valve leakage test device diagram
1-Pressure head oil pipe, 2-Dry plug: 3-Hose (removable) 4-measurement scale, 5-test quick cleaner; 6-test connection seat, 7-bleed screw; 8-oil inlet cock; 9-filter, 10-oil pump, 11-test fluid: 12-fuel tank 6 Test methods
6.1 Internal cleanliness test
JB/T6725-93
100
Figure 6 Static pressure damage test device diagram
1-manual high-pressure oil recorder, 2-switch valve : 3 - Pressure gauge: 4 - Filter under test: 5 - Switch reading: 6 - Oil registration
Figure 7 Vibration epidemic test device country
1 - Motor-driven oil pump; 2 Oil tank; 3 - pressure regulator; 4 - switch valve: 5 - pressure gauge: 6 - connecting block, 7 - input accelerometer; 8 - reducer in test: 9 - output accelerometer 6.1.1 Measurement method according to GB3821 Provisions. 6.1.2 Test results
The test report should include the following content:
a.
b.
c.
d.||tt| |e.
Filter model and manufacturer;
Test unit:
Test period;
Test results:
Tester.
6.2 Pressure drop-flow characteristic test
6.2.1 Working characteristics of the test
6.2.1.1 The full-flow oil filter on the internal combustion engine is installed in the oil extraction and engine main oil Between the channels, it must produce a pressure drop so that the effective oil pressure entering the engine is lower than the oil supply pressure of the oil pump. 5 | | tt | | JB/T6725-93 | | tt |
6.2.2 Test device (see Figure 1)
In Figure 1, 6d is the length of the straight pipe section of the inlet and outlet oil pipe. 6.2.3 Test fluid
At the test temperature, if simulating normal working conditions, an engine oil with a kinematic viscosity of 24 mm/s should be selected (for example, when CA30 engine oil is used, the oil temperature is about 74°C). If simulating cold Under normal working conditions, engine oil with a kinematic viscosity of 500mm/s should be selected. The oil temperature during the test should not exceed 100°C and the test fluid must be clean. To achieve these viscosities, two different oils can be used. 6.2.4 Test procedure
6.2.4.1 As shown in Figure 1, install the filter to be tested on the test bench. 6.2.4.2 Add the clean test fluid into the oil tank in the required amount so that it only circulates through the bypass oil circuit of the test bench and does not pass through the filter being tested. 6.2.4.3 Turn on the heater or cooler and adjust it to the required temperature to stabilize the oil temperature. 6.2.4. 4
6.2.4.5
After the oil temperature stabilizes, pass approximately 50% of the rated flow rate of engine oil through the filter under test and stabilize the oil temperature again. When the indication of the thermometer stabilizes at the required temperature value, start to measure the pressure drop through the filter, and select at least 6 increments that are approximately equal within the range of 10% to 110% of the rated volume flow base of the filter under test. The flow rate (preferably 8) is passed through the filter, and the flow rate and pressure should be kept stable while recording the reading at each test point. 6.2.4.6 For engine oils of different viscosities, the procedures specified in 6.2.4.2~6.2.4.5 should be followed. 6.2.4.7 The measurement accuracy of pressure is ±5%. 6.2.4.8 The measurement accuracy of flow rate is ±2%. 6.2.5 Test results
The relationship between flow rate and pressure drop through the filter under each viscosity should be represented by a curve graph. The test report should include the following content:
a.
b.
c.
d.
f.
6|| tt||Filter model and manufacturer:
Test unit;
Test date:
Test fluid viscosity: 24mm*/s
500mm*/s| |tt||Tester;
Characteristic curve (as shown in Figure 8).
No. engine oil
No. engine oil
:
C:
Flow rate L/min
Figure 8 Filter pressure drop - flow rate Characteristic curve
6.3 Filter bypass element characteristic test
6.3.1 Operating characteristics of the test
JB/T6725-93
6.3.1.1 Next to the oil filter element The function of the pass element is to maintain enough oil (even if this part of the oil is unfiltered) to be supplied to the engine when the pressure drop of the filter element is high. This can occur, for example, when the engine is started cold or when the filter element is clogged. 6.3.1.2 When the pressure drop through the filter is not too large, in order to limit unfiltered oil from entering the engine, the bypass element is usually designed not to open when it is lower than the specified pressure drop. When the pressure drop does not exceed this value, Bypass components are allowed to have leakage not exceeding the specified value. 6.3.1.3 When the filter element is completely clogged, in order to maintain a sufficient amount of engine oil supply to the engine, the bypass element designed to pass through all the engine oil should not exceed the specified pressure drop. The test specified in this standard measures the pressure drop before and after the bypass element over the entire oil flow range. 6.3.2 Test device (see Figure 1 and Figure 9). D |
6.3.4 Test procedure
6.3.4.1 Install the bypass valve assembly in a special test housing, as shown in Figure 9; D, equal to the filter diameter, in D, ≥ D. 6.3.4.2 Connect the test housing with bypass installed to the position of the filter under test in the test bench. 6.3.4.3 Add the required amount of clean test fluid into the fuel tank so that it only passes through the bypass circulation of the test bench and does not pass through the bypass door. 6.3.4.4 After the oil temperature stabilizes, the engine oil with approximately 50% of the rated volume flow rate is passed through the bypass and the oil temperature is stabilized again. 6.3.4.5 When the thermometer indication stabilizes at the required temperature, pass a certain flow of engine oil through the bypass valve, and then gradually reduce the flow until the bypass valve is closed. Repeat this several times and then reduce the flow to zero. 6.3.4.6 Slowly increase the oil inlet pressure. When the pressure difference before and after reaching the filter is 0.03MPa lower than the specified opening pressure, use a meter or micro flow meter to measure the leakage under this pressure drop. The leakage volume should be ensured to be stable before measuring the leakage volume. 6.3.4.7 Take at least 6 roughly equal flow increments between 0 and 110% of the rated volume flow of the filter, and measure the pressure drop at each point when passing through the bypass valve. The flow must increase to each point in order from small to large. Set value, pay attention to the opening pressure of the bypass valve. The flow rate should be allowed to stabilize before recording the pressure drop at each point.
6.3.4.8 When the flow rate reaches the highest value, then reduce the flow rate successively, measure the pressure drop at each point according to the same flow rate classification in 6.3.4.7, and pay attention to the closing pressure of the bypass wide. 6.3.4.9 If the bypass makes noise during the test, record the flow rate and noise characteristics at this time. If it is necessary to use two different viscosity engine oils for separate tests, the requirements of Article 6.2.3 should be followed. 6. 3. 4. 10
The measurement accuracy of pressure is ±5%.
6.3. 4.11
6.3.4.12 The measurement accuracy of flow rate is ±2%. 6.3.5 Test results
6.3.5.1 The relationship between the pressure drop and flow rate through the filter element bypass element under the specified viscosity should be represented by a curve chart. Mark the flow profile along the curve when the noise is emitted.
7
For example, when simulating cold working conditions, an engine oil with a kinematic viscosity of 500mm/s should be selected. The oil temperature during the test should not exceed 100°C and the test fluid must be clean. To achieve these viscosities, two different oils can be used. 6.2.4 Test procedure
6.2.4.1 As shown in Figure 1, install the filter to be tested on the test bench. 6.2.4.2 Add the clean test fluid into the oil tank in the required amount so that it only circulates through the bypass oil circuit of the test bench and does not pass through the filter being tested. 6.2.4.3 Turn on the heater or cooler and adjust it to the required temperature to stabilize the oil temperature. 6.2.4. 4
6.2.4.5
After the oil temperature stabilizes, pass approximately 50% of the rated flow rate of engine oil through the filter under test and stabilize the oil temperature again. When the indication of the thermometer stabilizes at the required temperature value, start to measure the pressure drop through the filter, and select at least 6 increments that are approximately equal within the range of 10% to 110% of the rated volume flow base of the filter under test. The flow rate (preferably 8) is passed through the filter, and the flow rate and pressure should be kept stable while recording the reading at each test point. 6.2.4.6 For engine oils of different viscosities, the procedures specified in 6.2.4.2~6.2.4.5 should be followed. 6.2.4.7 The measurement accuracy of pressure is ±5%. 6.2.4.8 The measurement accuracy of flow rate is ±2%. 6.2.5 Test results
The relationship between flow rate and pressure drop through the filter under each viscosity should be represented by a curve graph. The test report should include the following content:
a.
b.
c.
d.
f.
6|| tt||Filter model and manufacturer:
Test unit;
Test date:
Test fluid viscosity: 24mm*/s
500mm*/s| |tt||Tester;
Characteristic curve (as shown in Figure 8).
No. engine oil
No. engine oil
:
C:
Flow rate L/min
Figure 8 Filter pressure drop - flow rate Characteristic curve
6.3 Filter bypass element characteristic test
6.3.1 Operating characteristics of the test
JB/T6725-93
6.3.1.1 Next to the oil filter element The function of the pass element is to maintain enough oil (even if this part of the oil is unfiltered) to be supplied to the engine when the pressure drop of the filter element is high. This can occur, for example, when the engine is started cold or when the filter element is clogged. 6.3.1.2 When the pressure drop through the filter is not too large, in order to limit unfiltered oil from entering the engine, the bypass element is usually designed not to open when it is lower than the specified pressure drop. When the pressure drop does not exceed this value, Bypass components are allowed to have leakage not exceeding the specified value. 6.3.1.3 When the filter element is completely clogged, in order to maintain a sufficient amount of engine oil supply to the engine, the bypass element designed to pass through all the engine oil should not exceed the specified pressure drop. The test specified in this standard measures the pressure drop before and after the bypass element over the entire oil flow range. 6.3.2 Test device (see Figure 1 and Figure 9). D |
6.3.4 Test procedure
6.3.4.1 Install the bypass valve assembly in a special test housing, as shown in Figure 9; D, equal to the filter diameter, in D, ≥ D. 6.3.4.2 Connect the test housing with bypass installed to the position of the filter under test in the test bench. 6.3.4.3 Add the required amount of clean test fluid into the fuel tank so that it only passes through the bypass circulation of the test bench and does not pass through the bypass door. 6.3.4.4 After the oil temperature stabilizes, the engine oil with approximately 50% of the rated volume flow rate is passed through the bypass and the oil temperature is stabilized again. 6.3.4.5 When the thermometer indication stabilizes at the required temperature, pass a certain flow of engine oil through the bypass valve, and then gradually reduce the flow until the bypass valve is closed. Repeat this several times and then reduce the flow to zero. 6.3.4.6 Slowly increase the oil inlet pressure. When the pressure difference before and after reaching the filter is 0.03MPa lower than the specified opening pressure, use a meter or micro flow meter to measure the leakage under this pressure drop. The leakage volume should be ensured to be stable before measuring the leakage volume. 6.3.4.7 Take at least 6 roughly equal flow increments between 0 and 110% of the rated volume flow of the filter, and measure the pressure drop at each point when passing through the bypass valve. The flow must increase to each point in order from small to large. Set value, pay attention to the opening pressure of the bypass valve. The flow rate should be allowed to stabilize before recording the pressure drop at each point.
6.3.4.8 When the flow rate reaches the highest value, then reduce the flow rate successively, measure the pressure drop at each point according to the same flow rate classification in 6.3.4.7, and pay attention to the closing pressure of the bypass wide. 6.3.4.9 If the bypass makes noise during the test, record the flow rate and noise characteristics at this time. If two engine oils of different viscosities need to be tested separately, the requirements of Article 6.2.3 should be followed. 6. 3. 4. 10
The measurement accuracy of pressure is ±5%.
6.3. 4.11
6.3.4.12 The measurement accuracy of flow rate is ±2%. 6.3.5 Test results
6.3.5.1 The relationship between the pressure drop and flow rate through the filter element bypass element under the specified viscosity should be represented by a curve chart. Mark the flow profile along the curve when the noise is emitted.
7
For example, when simulating cold working conditions, an engine oil with a kinematic viscosity of 500mm/s should be selected. The oil temperature during the test should not exceed 100°C and the test fluid must be clean. To achieve these viscosities, two different oils can be used. 6.2.4 Test procedure
6.2.4.1 As shown in Figure 1, install the filter to be tested on the test bench. 6.2.4.2 Add the clean test fluid into the oil tank in the required amount so that it only circulates through the bypass oil circuit of the test bench and does not pass through the filter being tested. 6.2.4.3 Turn on the heater or cooler and adjust it to the required temperature to stabilize the oil temperature. 6.2.4. 4
6.2.4.5
After the oil temperature stabilizes, pass approximately 50% of the rated flow rate of engine oil through the filter under test and stabilize the oil temperature again. When the indication of the thermometer stabilizes at the required temperature value, start to measure the pressure drop through the filter, and select at least 6 increments of approximately equal value within the range of 10% to 110% of the rated volume flow base of the filter under test. The flow rate (preferably 8) is passed through the filter, and the flow rate and pressure should be kept stable while recording the reading at each test point. 6.2.4.6 For engine oils of different viscosities, the procedures specified in 6.2.4.2~6.2.4.5 should be followed. 6.2.4.7 The measurement accuracy of pressure is ±5%. 6.2.4.8 The measurement accuracy of flow rate is ±2%. 6.2.5 Test results
The relationship between flow rate and pressure drop through the filter under each viscosity should be represented by a curve graph. The test report should include the following content:
a.
b.
c.
d.
f.
6|| tt||Filter model and manufacturer:
Test unit;
Test date:
Test fluid viscosity: 24mm*/s
500mm*/s| |tt||Tester;
Characteristic curve (as shown in Figure 8).
No. engine oil
No. engine oil
:
C:
Flow rate L/min
Figure 8 Filter pressure drop - flow rate Characteristic curve
6.3 Filter bypass element characteristic test
6.3.1 Operating characteristics of the test
JB/T6725-93
6.3.1.1 Next to the oil filter element The function of the pass element is to maintain enough oil (even if this part of the oil is unfiltered) to be supplied to the engine when the pressure drop of the filter element is high. This can occur, for example, when the engine is started cold or when the filter element is clogged. 6.3.1.2 When the pressure drop through the filter is not too large, in order to limit unfiltered oil from entering the engine, the bypass element is usually designed not to open when it is lower than the specified pressure drop. When the pressure drop does not exceed this value, Bypass components are allowed to have leakage not exceeding the specified value. 6.3.1.3 When the filter element is completely clogged, in order to maintain a sufficient amount of engine oil supply to the engine, the bypass element designed to pass through all the engine oil should not exceed the specified pressure drop. The test specified in this standard measures the pressure drop before and after the bypass element over the entire oil flow range. 6.3.2 Test device (see Figure 1 and Figure 9). D |
6.3.4 Test procedure
6.3.4.1 Install the bypass valve assembly in a special test housing, as shown in Figure 9; D, equal to the filter diameter, in D, ≥ D. 6.3.4.2 Connect the test housing with bypass installed to the position of the filter under test in the test bench. 6.3.4.3 Add the required amount of clean test fluid into the fuel tank so that it only passes through the bypass circulation of the test bench and does not pass through the bypass door. 6.3.4.4 After the oil temperature stabilizes, the engine oil with approximately 50% of the rated volume flow rate is passed through the bypass and the oil temperature is stabilized again. 6.3.4.5 When the thermometer indication stabilizes at the required temperature, pass a certain flow of engine oil through the bypass valve, and then gradually reduce the flow until the bypass valve is closed. Repeat this several times and then reduce the flow to zero. 6.3.4.6 Slowly increase the oil inlet pressure. When the pressure difference before and after reaching the filter is 0.03MPa lower than the specified opening pressure, use a meter or micro flow meter to measure the leakage under this pressure drop. The leakage volume should be ensured to be stable before measuring the leakage volume. 6.3.4.7 Take at least 6 roughly equal flow increments between 0 and 110% of the rated volume flow of the filter, and measure the pressure drop at each point when passing through the bypass valve. The flow must increase to each point in order from small to large. Set value, pay attention to the opening pressure of the bypass valve. The flow rate should be allowed to stabilize before recording the pressure drop at each point.
6.3.4.8 When the flow rate reaches the highest value, then reduce the flow rate successively, measure the pressure drop at each point according to the same flow rate classification in 6.3.4.7, and pay attention to the closing pressure of the bypass wide. 6.3.4.9 If the bypass makes noise during the test, record the flow rate and noise characteristics at this time. If two engine oils of different viscosities need to be tested separately, the requirements of Article 6.2.3 should be followed. 6. 3. 4. 10
The measurement accuracy of pressure is ±5%.
6.3. 4.11
6.3.4.12 The measurement accuracy of flow rate is ±2%. 6.3.5 Test results
6.3.5.1 The relationship between the pressure drop and flow rate through the filter element bypass element under the specified viscosity should be represented by a curve chart. Mark the flow along the curve when the noise is emitted.
7
3. Add the required amount of clean test fluid to the fuel tank so that it only passes through the bypass circulation of the test bench and does not pass through the bypass door. 6.3.4.4 After the oil temperature stabilizes, the engine oil with approximately 50% of the rated volume flow rate is passed through the bypass and the oil temperature is stabilized again. 6.3.4.5 When the thermometer indication stabilizes at the required temperature, pass a certain flow of engine oil through the bypass valve, and then gradually reduce the flow until the bypass valve is closed. Repeat this several times and then reduce the flow to zero. 6.3.4.6 Slowly increase the oil inlet pressure. When the pressure difference before and after reaching the filter is 0.03MPa lower than the specified opening pressure, use a meter or micro flow meter to measure the leakage under this pressure drop. The leakage volume should be ensured to be stable before measuring the leakage volume. 6.3.4.7 Take at least 6 roughly equal flow increments between 0 and 110% of the rated volume flow of the filter, and measure the pressure drop at each point when passing through the bypass valve. The flow must increase to each point in order from small to large. Set value, pay attention to the opening pressure of the bypass valve. The flow rate should be allowed to stabilize before recording the pressure drop at each point.
6.3.4.8 When the flow rate reaches the highest value, then reduce the flow rate successively, measure the pressure drop at each point according to the same flow rate classification in 6.3.4.7, and pay attention to the closing pressure of the bypass wide. 6.3.4.9 If the bypass makes noise during the test, record the flow rate and noise characteristics at this time. If two engine oils of different viscosities need to be tested separately, the requirements of Article 6.2.3 should be followed. 6. 3. 4. 10
The measurement accuracy of pressure is ±5%.
6.3. 4.11
6.3.4.12 The measurement accuracy of flow rate is ±2%. 6.3.5 Test results
6.3.5.1 The relationship between the pressure drop and flow rate through the filter element bypass element under the specified viscosity should be represented by a curve chart. Mark the flow profile along the curve when the noise is emitted.
7
3. Add the required amount of clean test fluid into the fuel tank so that it only passes through the bypass circulation of the test bench and does not pass through the bypass door. 6.3.4.4 After the oil temperature stabilizes, the engine oil with approximately 50% of the rated volume flow rate is passed through the bypass and the oil temperature is stabilized again. 6.3.4.5 When the thermometer indication stabilizes at the required temperature, pass a certain flow of engine oil through the bypass valve, and then gradually reduce the flow until the bypass valve is closed. Repeat this several times and then reduce the flow to zero. 6.3.4.6 Slowly increase the oil inlet pressure. When the pressure difference before and after reaching the filter is 0.03MPa lower than the specified opening pressure, use a meter or micro flow meter to measure the leakage under this pressure drop. The leakage volume should be ensured to be stable before measuring the leakage volume. 6.3.4.7 Take at least 6 roughly equal flow increments between 0 and 110% of the filter's rated volume flow, and measure the pressure drop at each point when passing through the bypass valve. The flow must increase to each point in order from small to large. Set value, pay attention to the opening pressure of the bypass valve. The flow rate should be allowed to stabilize before recording the pressure drop at each point.
6.3.4.8 When the flow rate reaches the highest value, then reduce the flow rate successively, measure the pressure drop at each point according to the same flow rate classification in 6.3.4.7, and pay attention to the closing pressure of the bypass wide. 6.3.4.9 If the bypass makes noise during the test, record the flow rate and noise characteristics at this time. If two engine oils of different viscosities need to be tested separately, the requirements of Article 6.2.3 should be followed. 6. 3. 4. 10
The measurement accuracy of pressure is ±5%.
6.3. 4.11
6.3.4.12 The measurement accuracy of flow rate is ±2%. 6.3.5 Test results
6.3.5.1 The relationship between the pressure drop and flow rate through the filter element bypass element under the specified viscosity should be represented by a curve chart. Mark the flow profile along the curve when the noise is emitted.
7
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