This part specifies the test for determining the bypass valve characteristics of the filter element of the full-flow oil filter of the internal combustion engine. The test specifies the use of two viscosity oils to evaluate the performance of the filter element bypass valve when using low temperature oil and normal operating temperature oil. GB/T 8243.2-2003 Test methods for full-flow oil filters for internal combustion engines Part 2: Filter element bypass valve characteristics GB/T8243.2-2003 Standard download decompression password: www.bzxz.net

GB/T8243.2--2003/ISO 4548-2:1997 GB/T8243 "Test methods for full-flow oil filters for internal combustion engines" currently includes the following parts: Part 1: Pressure difference-flow characteristics; Part 2: Filter element bypass valve characteristics; Part 3: High pressure difference and high temperature resistance characteristics; Part 4: Initial filtration efficiency, life and cumulative efficiency (weight method); Part 5: Cold start simulation and hydraulic pulse endurance test; Part 6: Static pressure burst test; Part 7: Vibration fatigue test; Part 9: Inlet and outlet check valve test; Part 10: Life and cumulative efficiency when the oil contains water; Part 11: Self-cleaning filter; Part 12: Determination of filtration efficiency and ash holding capacity by particle counting method. This part is Part 2 of GB/T8243.
This part is equivalent to the international standard ISO4548-2:1997 "Test methods for full-flow oil filters for internal combustion engines Part 2: Characteristics of filter element bypass valve" (English version)
Characteristics of filter element bypass element".
This part replaces GB/T8243.4-1987 "Test methods for full-flow lubricating oil filters for diesel engines". This part is proposed by the China Machinery Industry Federation. This part is under the jurisdiction of the National Technical Committee for Standardization of Internal Combustion Engines. The drafting units of this part: Shanghai Internal Combustion Engine Research Institute, the 711th Institute of the 7th Research Institute of China Shipbuilding Industry Corporation. The drafters of this part: Qu Junming, Hong Dunlin, Song Guochan, Yao Kangmao, Chen Linshan. GB/T8243.2-2003/IS04548-2:1997 Introduction
GB/T8243 specifies the standard test procedures for measuring the performance of full-flow oil filters for internal combustion engines. The standard is compiled from individual parts, each of which deals with a certain operating characteristic. The whole set of tests provides the necessary information for evaluating the filter characteristics, but can be tested separately if the user and the manufacturer agree.
This standard has been revised to make the presentation consistent with the requirements of the current ISO guidelines. The main changes are editorial changes to the layout and text. Minor changes have also been made to the technical content, including the provision of ISO VG and SAE grade oil grades for the test fluid, and the revision of the test bench dimensions to be consistent with ISO3968. In addition, the flow meter on the test bench has been relocated downstream of the throttle valve. I
1 Scope
GB/T 8243.2—2003/ISO 4548-2:1997 Test methods for full-flow oil filters for internal combustion engines Part 2: Filter element bypass valve characteristics
This part of GB/T 8243 specifies the test for determining the bypass valve characteristics of full-flow oil filters for internal combustion engines. The test specifies the use of two viscosity oils to evaluate the performance of the filter element bypass valve when using low-temperature oil and normal operating temperature oil. 2 Normative references
The provisions of the following documents become the provisions of this part through reference to this part of GB/T 8243. For any dated referenced document, all subsequent amendments (excluding errata) or revisions are not applicable to this part, however, parties to an agreement based on this part are encouraged to investigate whether the latest versions of these documents can be used. For any undated referenced document, the latest version of the document applies to this part.
ISO1219-1:1991 Graphical symbols and schematics for hydraulic transmission systems and components Part 1: Graphical symbols ISO11841-1 Vocabulary of filters for road vehicles and internal combustion engines Part 1: Definitions of filters and their components ISO11841-2 Vocabulary of filters for road vehicles and internal combustion engines Part 2: Definitions of characteristics of filters and their components 3 Definitions
This part of GB/T8243 adopts the definitions specified in ISO11841-1 and ISO11841-2. 4 Graphical symbols
The graphical symbols used in this part of GB/T8243 are in accordance with the provisions of ISO1219-1. 5 Working characteristics to be tested
The function of the oil filter element bypass valve is to keep sufficient, even unfiltered, oil supplied to the engine when the filter element pressure difference is too high, for example, when the engine is started at low temperature or the filter element is blocked. This situation will occur. In order to limit the amount of unfiltered oil that enters the engine when the filter pressure difference is not too high, the bypass valve should usually be designed so that it will not open when the pressure difference is below the specified value, and allow oil not exceeding the specified flow rate to leak out when the pressure difference does not exceed this value. In order to keep enough oil supplied to the engine when the filter element is completely blocked, the bypass valve should usually be designed so that it will not exceed the specified pressure difference when the full flow rate of oil passes through it. The tests specified in this part of GB/T8243 are used to measure the pressure difference of the bypass valve over the entire oil flow range.
These tests include the requirement to record any noise made by the bypass valve, such as due to valve vibration, because it has been found that the noise of these parts is related to wear.
6 Filters to be tested
6.1 Filter assembly
Remove the filter element in the filter and install an oil-tight filter element model of the same size in its place. When it is difficult to replace the filter element with an oil-tight filter element model, such as a spin-on filter, the filter should be opened, the bypass valve removed and placed in a separate housing for testing. The design of the housing should be agreed upon by the filter manufacturer and the user. 1
GB/T8243.2—2003/ISO4548-2:19976.2 Bypass valve
The bypass valve, test fluid and test bench of the test filter should be kept clean. The term "clean" in this part of GB/T8243 means that when the test fluid circulates through the test bench and the filter at the rated flow rate of the filter at the test temperature for 5 minutes, no increase in the pressure difference of the test filter (not modified according to 6.1) is detected. 7 Test bench
Figure 1 is the general layout of the test bench, which should include the components described in 7.1 to 7.5, as well as the necessary pipes, joints and supports.
Device pressure differential gauge
Label explanation:
or two separate pressure gauges;
Oil tank equipped with thermostatically controlled heater and cooler (preferably insulated); 2
Electric pump:
3---——Regulating valve (for regulating pressure); 4--Switch valve;
A flow meter;
Test filter;
Temperature sensor connected to temperature indicator; -Pressure gauge;
A differential pressure gauge or two separate pressure gauges for measuring the pressure differential of filter bypass components; A sampling valve installed on the filter outlet pipe to introduce the engine oil into the measuring tube; Regulating valve (for regulating flow);
A differential pressure gauge or two separate pressure gauges for measuring the pressure differential of filter bypass components when necessary; Natural oil drain pipe.
Figure 1 General layout of the test bench
7.1 Oil tank
GB/T 8243.2—2003/ISO 4548-2: 1997 The oil tank should be able to store sufficient oil and should be equipped with a thermostatically controlled heater and cooler to maintain a stable test temperature. The heater should be arranged to avoid local overheating of the oil. When the oil circulates, the return pipe to the oil tank and the oil outlet pipe of the filter should have their terminals below the tank liquid level. The temperature should be adjusted to keep the oil viscosity within the specified range. 7.2 Regulating valve
Regulating valves 3 and 11 are used to control pressure and flow. Needle valves or diaphragm valves are recommended. 7.3 Flowmeter
The flowmeter should be suitable for oils with kinematic viscosities of 24mm2/sl and 500mm2/s, and should record the flow in the pipeline to the filter. Alternatively, the flow meter can be installed in the filter outlet pipe, and a calibrated measuring cylinder and stopwatch can be used for measurement. 7.4 Filter inlet and outlet pipes
The diameter of the inlet and outlet pipes should be the same as the size of the filter inlet and outlet holes, or the filter manufacturer and the user can agree on the size of the inlet and outlet pipes, for example, consistent with the hole on the engine body where the filter is installed. The screw holes for measuring the pressure difference of the entire filter set should be set 5 times the pipe diameter upstream of the filter inlet hole and 10 times the pipe diameter downstream of the filter outlet hole. The inlet and outlet pipes within the range of 8 times the pipe diameter upstream and 13 times the pipe diameter downstream of the filter inlet and outlet holes should be straight pipe sections without any obstruction.
7.5 Sampling valve oil drain pipe
In order to avoid draining the oil outlet pipe of the entire filter set when measuring the leakage, the natural oil drain pipe of the sampling valve 10 should be placed at the same height as the test filter.
Note: The oil drain pipe is not shown in Figure 1.
8 Test fluid
Unless the filter manufacturer and the user agree otherwise, a suitable engine oil and a suitable temperature should be selected for the test so that the kinematic viscosity reaches 24mm2/s when simulating normal operating conditions and 500mm2/s when simulating low temperature conditions. The engine oil temperature must not exceed 100℃.
Note 1: In order to achieve these viscosities, it may be necessary to use two different engine oils. At a temperature of about 74 °C, using ISOVG100 (SAE30) oil (see [17 and L3I, or at a temperature of about 83 °C, using ISOVG150 (SAE40) oil, the viscosity can reach 24 mm2/s. At a temperature of about 38 °C, using ISOVG460 (SAE140) oil (see [1] and [3J), the viscosity can reach 500 mm2/s. NOTE 2: In particular, when two specified test oils are used alternately on the same test equipment, there is a possibility of mixing. The change in the resultant viscosity should be closely monitored and the change in viscosity should be adjusted by changing the test temperature or replacing part or all of the test oil. 9 Measurement accuracy of test conditions
The measurement of test conditions should be maintained within the accuracy specified in Table 1. The unit of measurement of pressure difference is kilopascal (kPa). Table 1 Measurement accuracy
Test conditions
Oil viscosity
Oil flow rate
1) 1 mm/s=1 cSt.
Accuracy/%
GB/T8243.2—2003/ISO4548-2:199710Test Procedure
10.1Install the test filter (modified according to 6.1) on the test bench as shown in Figure 1. 10.2Add clean test fluid into the oil tank 1 as required and allow it to circulate in the test bench only through the bypass pipe. At this stage, the test fluid should not flow through the filter.
10.3Turn on the heater or cooler, adjust the thermostat to the required temperature (see Chapter 8), and allow the temperature to gradually stabilize. 10.4When the oil temperature in the oil tank 1 reaches a stable state, allow the test fluid to pass through the filter bypass valve at about 50% of the rated flow rate and allow the temperature to stabilize again. If necessary, the test fluid in the system can be released. 10.5 When the temperature indicator 7 shows that the oil temperature at the filter inlet has stabilized at the required value (see Chapter 8), connect the natural drain pipe on the sampling valve 10 to allow the collected oil to flow back to the tank. Repeat several times to reduce the amount of oil passing through the filter bypass valve to zero. 10.6 Slowly increase the oil inlet pressure of the filter element bypass valve to 10% lower than the minimum allowable opening pressure value specified for the valve. Collect the oil flowing out of the sampling valve 10 in a scaled measuring tube and measure the leakage under the pressure difference. Use a stopwatch to measure the time required for oil sample collection. Before collecting oil samples, ensure that the leakage reaches a stable level. Note: When there is no technical specification, the pressure at a viscosity of 24 mm/s and a flow rate of 1 L/min should be used as the valve opening pressure. 10.7 Within the filter's 110% rated flow range, take at least 8 flow points in approximately equal increments, measure the pressure difference of the filter element bypass valve at each point, and record the opening pressure of the bypass valve. Note: The flow rate is adjusted to the required value by adjusting the pressure regulating valve 3 and the flow regulating valve 11 to ensure that the inlet pressure is greater than the indicated differential pressure and that the filter outlet is under positive pressure. The flow rate should be gradually approached from a low flow rate to the required flow rate value each time. Before taking each differential pressure reading, the flow rate should be allowed to remain stable for at least 10 seconds or the pressure reading should be stable.
10.8 Reduce the flow rate and measure the differential pressure of the filter element bypass valve at the same flow rate and the procedure described in 10.7, gradually approaching the required flow rate each time from a high flow rate. Record the closing pressure of the bypass valve. 10.9 When the differential pressure drops below 10% of the minimum opening pressure specified for the filter element bypass valve, measure the leakage at this differential pressure according to 10.6. 10.10 If the filter element bypass component makes noise during the test, the flow rate and noise characteristics at this time should be recorded. 10.11 Measure each viscosity of engine oil according to the procedures described in 10.2 to 10.10. 11 Test Result Report
A typical test report is shown in Figure 2. It includes a graph showing the pressure differential of the filter element bypass valve as the flow rate increases or decreases at each viscosity. The flow rate in the noise zone should be marked along the curve.
Testing unit
Filter type
Manufacturer
Model and/or batch number (if applicable)
Test date
Test fluid [24 mm2/s]
Test fluid [500 mm2/s]
Filter element bypass valve test report
(Brand) Temperature
(Brand) Temperature
GB/T8243.2--2003/ISO4548-2:1997℃
At a viscosity of 24 mm2/s, the leakage at the specified minimum allowable opening pressure e)
When the pressure increases
When the pressure decreases
At the specified flow rate
(L/min) and viscosity
(mm2/s), the opening pressure of the measured bypass valve is the pressure difference at the rated flow rate when the viscosity is 24mm2/s and 500mm2/s: g)
When the pressure increases
The pressure is stored in hours
Attached is a schematic diagram of the bypass valve test device and the position of the pressure measuring hole h)
Characteristic curve
The maximum allowable pressure specified at the rated flow rate Difference kPa
500mm2/s
24mm2/s
Rated flow/L, min-1
Flow increasing
Flow decreasing
Noise area
Figure 2 Test report example
GB/T8243.2—2003/IS04548-2:1997L11
References
ISO3448:1992, Industrial liquid lubricants - ISO viscosity classification 1ISO3968:1981, Evaluation of pressure drop and flow characteristics of hydraulic transmission filters. [2]
ANSI/SAEJ300-1993, Engine oil viscosity classificationThe pressure at a viscosity of 24 mm/s and a flow rate of 1 L/min shall be taken as the opening pressure of the valve. 10.7 Take at least 8 flow points in approximately equal increments within the filter's 110% rated flow range, measure the pressure difference at each point of the filter element bypass valve, and record the opening pressure of the bypass valve. Note: The flow rate is adjusted to the required value by adjusting the pressure regulating valve 3 and the flow regulating valve 11 to ensure that the inlet pressure is greater than the indicated pressure difference to maintain a positive pressure at the filter outlet. The flow rate should be gradually approached from a low flow rate to the required flow value each time. Before each differential pressure reading is taken, the flow rate should be allowed to remain stable for at least 10 seconds or the pressure reading should be stable.
10.8 Reduce the flow rate and measure the pressure difference of the filter element bypass valve at the same flow rate used in 10.7 and using the procedure described in 10.7, gradually approaching the required flow value each time from a high flow rate. Record the closing pressure of the bypass valve. 10.9 When the pressure difference drops below 10% of the minimum opening pressure specified for the filter element bypass valve, measure the leakage at this pressure difference according to 10.6. 10.10 If the filter element bypass component makes noise during the test, the flow rate and noise characteristics at this time should be recorded. 10.11 For each viscosity of engine oil, measure the procedure described in 10.2 to 10.10. 11 Test Results Report
A typical test report is shown in Figure 2. It includes a graph of the filter element bypass valve pressure difference as the flow rate increases and decreases at each viscosity. The flow rate in the noise area should be marked along the curve.
Testing unit
Filter type
Manufacturer
Model and/or batch number (if applicable)
Test date
Test fluid [24 mm2/s]
Test fluid [500 mm2/s]
Filter element bypass valve test report
(Brand) Temperature
(Brand) Temperature
GB/T8243.2--2003/ISO4548-2:1997℃
At a viscosity of 24 mm2/s, the leakage at the specified minimum allowable opening pressure e)
When the pressure increases
When the pressure decreases
At the specified flow rate
(L/min) and viscosity
(mm2/s), the opening pressure of the measured bypass valve is the pressure difference at the rated flow rate when the viscosity is 24mm2/s and 500mm2/s: g)
When the pressure increases
The pressure is stored in hours
Attached is a schematic diagram of the bypass valve test device and the position of the pressure measuring hole h)
Characteristic curve
The maximum allowable pressure specified at the rated flow rate Difference kPa
500mm2/s
24mm2/s
Rated flow/L, min-1
Flow increasing
Flow decreasing
Noise area
Figure 2 Test report example
GB/T8243.2—2003/IS04548-2:1997L11
References
ISO3448:1992, Industrial liquid lubricants - ISO viscosity classification 1ISO3968:1981, Evaluation of pressure drop and flow characteristics of hydraulic transmission filters. [2]
ANSI/SAEJ300-1993, Engine oil viscosity classificationThe pressure at a viscosity of 24 mm/s and a flow rate of 1 L/min shall be taken as the opening pressure of the valve. 10.7 Take at least 8 flow points in approximately equal increments within the filter's 110% rated flow range, measure the pressure difference at each point of the filter element bypass valve, and record the opening pressure of the bypass valve. Note: The flow rate is adjusted to the required value by adjusting the pressure regulating valve 3 and the flow regulating valve 11 to ensure that the inlet pressure is greater than the indicated pressure difference to maintain a positive pressure at the filter outlet. The flow rate should be gradually approached from a low flow rate to the required flow value each time. Before each differential pressure reading is taken, the flow rate should be allowed to remain stable for at least 10 seconds or the pressure reading should be stable.
10.8 Reduce the flow rate and measure the pressure difference of the filter element bypass valve at the same flow rate used in 10.7 and using the procedure described in 10.7, gradually approaching the required flow value each time from a high flow rate. Record the closing pressure of the bypass valve. 10.9 When the pressure difference drops below 10% of the minimum opening pressure specified for the filter element bypass valve, measure the leakage at this pressure difference according to 10.6. 10.10 If the filter element bypass component makes noise during the test, the flow rate and noise characteristics at this time should be recorded. 10.11 For each viscosity of engine oil, measure the procedure described in 10.2 to 10.10. 11 Test Results Report
A typical test report is shown in Figure 2. It includes a graph of the filter element bypass valve pressure difference as the flow rate increases and decreases at each viscosity. The flow rate in the noise area should be marked along the curve.
Testing unit
Filter type
Manufacturer
Model and/or batch number (if applicable)
Test date
Test fluid [24 mm2/s]
Test fluid [500 mm2/s]
Filter element bypass valve test report
(Brand) Temperature
(Brand) Temperature
GB/T8243.2--2003/ISO4548-2:1997℃
At a viscosity of 24 mm2/s, the leakage at the specified minimum allowable opening pressure e)
When the pressure increases
When the pressure decreases
At the specified flow rate
(L/min) and viscosity
(mm2/s), the opening pressure of the measured bypass valve is the pressure difference at the rated flow rate when the viscosity is 24mm2/s and 500mm2/s: g)
When the pressure increases
The pressure is stored in hours
Attached is a schematic diagram of the bypass valve test device and the position of the pressure measuring hole h)
Characteristic curve
The maximum allowable pressure specified at the rated flow rate Difference kPa
500mm2/s
24mm2/s
Rated flow/L, min-1
Flow increasingWww.bzxZ.net
Flow decreasing
Noise area
Figure 2 Test report example
GB/T8243.2—2003/IS04548-2:1997L11
References
ISO3448:1992, Industrial liquid lubricants - ISO viscosity classification 1ISO3968:1981, Evaluation of pressure drop and flow characteristics of hydraulic transmission filters. [2]
ANSI/SAEJ300-1993, Engine oil viscosity classification
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