Some standard content:
J20
JB
Machinery Industry Standard of the People's Republic of China
JB/T6683-93
Combination valve block for hydraulic steering gear
Published on June 4, 1993
Ministry of Machinery Industry of the People's Republic of China
Published
Implementation on January 1, 1994
Machinery Industry Standard of the People's Republic of China
Combination valve block for hydraulic steering gear
Subject content and scope of application
JB/T6683-93
This standard specifies the type, basic parameters, technical requirements, test methods, inspection rules and markings, packaging, and other requirements of the combination valve block (hereinafter referred to as the combination valve block) for use with BZZ type cycloid rotary valve type full hydraulic steering gear. This standard applies to combination valve blocks with hydraulic oil or other mineral oils with equivalent performance as the working medium. 2 Reference standards
GB2828 Batch inspection counting sampling procedure and sampling table (applicable to continuous batch inspection) JB5120 Cycloidal rotary valve type full hydraulic steering gear 3 Types
3.1 Classification
Combination valve blocks are divided into five types according to the functions of the valves integrated in the valve block, namely FKA type, FKB type, FKC type, FKD type and FKE type. Graphic symbols are shown in Figures 1, 2, 3, 4 and 5. Figure
FKA
Figure 3FK C
Approved by the Ministry of Machinery Industry on June 4, 1993
Figure 5FKE
Figure 2FKB
Figure 4FKD
Implemented on January 1, 1994
1
3.2
Model marking
000-00-0
Marking example:
JB/T6683-93
Bidirectional buffer width set pressure, MPa
Nominal (rated) flow, L/min
Maximum set pressure of relief valve:
C-6.3MPa
D-10MPa;
E-16MPa
Block type: square, no mark
T shape.2
Function of valve block;
A; The block contains one-way valve, relief valve, two-way buffer valve and two-way oil replenishment valve:
B: The block contains one-way valve, two-way buffer valve and two-way oil replenishment valve C. The valve block contains a one-way valve, a relief valve and a two-way buffer valve D: The valve block contains a one-way valve and a two-way buffer valve: E: The valve block contains a one-way valve and a relief valve
Valve block name: FK
The combined valve block contains a one-way valve, a relief valve, a two-way buffer valve and a two-way oil replenishment valve. The valve block is square, the maximum set pressure of the relief valve is 10MPa, the nominal flow is 30L/min, and the maximum set pressure of the two-way buffer valve is 15MPa. The model is: FKA-D30-15. b. The combined valve block contains a one-way valve and a two-way buffer valve. The valve block is T-shaped, the nominal flow is 30L/min, and the maximum set pressure of the two-way buffer valve is 20MPa. The model is: FKD2-30-20. The combination valve block contains a one-way valve and an overflow valve. The valve block is square, the maximum set pressure of the overflow valve is 10MPa, the nominal flow is 30L/min, and the model is: FKE-D30
4 Basic parameters and connection dimensions of the combination valve block The basic parameters and connection dimensions of the combination valve block shall comply with the provisions of Table 1 and Figures 6 and 7, and the matching dimensions of the joint surface with the hydraulic steering gear shall comply with the provisions of JB5120.
Table 1 Basic parameters of combined valve block for hydraulic steering gear Type
No.
FKA-C30-10
FKC-C30-10
FKB-30-10
FKD-30-10
FKE-C30
FKA-D30-15
FKC-D30-15
FKB-30-15
FKD-30-15||tt| |FKE-D30
2
Nominal flow
L/min
30
30
Maximum set pressure of relief valve
MPs
6.3
6.3
10
10
Maximum set pressure of two-way buffer valve
MPa
10
15
Model
No.
FK A-E30-20
FKC-E30-20
FKB-30-20
FKD-30-20
FKE-E30
Nominal flow
L/min
30
Note: Each model has square and T-shaped, 2-412.5
Figure 6 Square combination ceramic block
Note, old product D=20 new development product D=225 combination block technical requirements||t t||JB/T668393
Continued Table 1
Reverse flow volume maximum set pressure
MPa
16
16
Maximum set pressure of bidirectional buffer
MPa
20
01o0
G
6
Figure 7 T-shaped combination valve block
The combination block shall comply with the requirements of this standard and be manufactured in accordance with the national samples and technical documents approved through the prescribed procedures. .1
5.2 The combined valve block shall meet the following requirements when tested at an oil temperature of 50℃ and an oil kinematic viscosity of 17~33mm*/s: a. The performance shall comply with the provisions of Table 2:
b. After the overflow valve is opened and closed 300,000 times and the two-way buffer valve is opened and closed 50,000 times each, the opening and closing characteristics shall not decrease by more than 10% compared with the specified value, and the pressure swing shall not increase by more than 10% compared with the specified value: c. During the pressure test with the test pressure being 1.25 times the maximum set pressure of the overflow valve and the pressure maintained for 5 minutes, there shall be no abnormal phenomena such as external leakage and damage.
5.3 The materials of the parts shall comply with the provisions of the drawings, and substitution is allowed without reducing the product quality. 5.4 The combined valve block shall be able to work normally within a range of -20~80℃. 5.5 The internal cleanliness of the combined valve block stipulates that the weight of the dirt shall not exceed 200mg. 5.6 All parts (including outsourced parts and purchased parts) can be put into storage only after passing the inspection. The parts should be cleaned and deburred before assembly. Parts that are deformed, damaged or rusted due to improper storage or transportation and affect product quality shall not be used for assembly. 5.7 Assembly tools must be used when installing the valve block to prevent damage to the sealing part and causing the sealing edge to be cut. 5.8 For the combined valve block that has passed the inspection, all exposed oil ports should be sealed with oil-resistant plugs, and the joint surfaces should be coated with anti-rust grease. Other surfaces are coated with grease, and the coating thickness and color must be uniform. 5.9 All exposed oil ports of the reading body should be clearly marked with symbols indicating the function of the port: PB-
Working oil port,
-pressure oil port: T
Return oil port: A
3
6683-93
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Combined valve block test method
6
6.1 Test conditions
6.1 .1. Test oil
a. Viscosity
JB/T6683-93
At 50C, the kinematic viscosity is 17~33mm*/s (special requirements will be specified separately). b. Oil temperature
When performing the test, unless otherwise specified, the temperature of the oil entering the component being tested: the type test shall be conducted at 50 ± 2°C; the factory test shall be conducted at 50 ± 4°C.
e. Cleanliness level
The solid pollution level of the test oil shall not be higher than level 11. 6.1.2 Test device
a.
b.
The principle of the test system is shown in Figure A1 in Appendix A (reference part). The measurement accuracy level of the test system should be selected and maintained in the table 3. Within the scope specified in 3, type testing adopts Class B accuracy and factory testing adopts Class C accuracy.
Table 3 Allowable error of test system
Instrument, table name only
Pressure gauge %
Flow meter %
Thermometer.℃||tt| |B
±1.0
±0.5
±2. 0
Note: Only the maximum range of the table shall not exceed 2 times the maximum parameter value of the component under test. 6.1.3 Measure the whole point position
a.
measure
meaning
level
differential
c
± 1.5 | | tt | | ±1.0 | | tt | | ± 4.0 | During the steady-state test, it is allowed to move the measuring point farther away from the overflow block under test, but the actual pressure loss of the pipeline must be considered. The temperature measurement point should be set 2d to 4d upstream from the pressure measurement point. h.
6.1.4 Steady-state condition accuracy level
When the average index value of the measured parameters changes within the range specified in Table 4, the measured values ??of the test parameters are allowed to be recorded. Table 4 The allowable variation range of the average index value of the measured parameters glass
control
pressure
flow
force
quantity %
Level B| | tt | |Test items and methods are shown in Table 5.
6.2.1. Combined valve block type test items
Test accuracy level
c-level
±2. 5
±2.5
Includes all test items of No. 1 relief valve, No. 2 two-way buffer valve, No. 3 one-way valve and No. 4 two-way oil replenishment valve in Table 5
6.2.2 The factory test items of the combined block
include the test items of 1.1, 1.2, 1.3 of the overflow reading of serial number 1 and the two-way buffer reading of serial number 2 and 2.1, 2.2, 2.3 of serial number 5 and the test items of serial number 5 in Table 5: where the serial number 1.3 and serial number 5 are random test items. Serial number
1
1.1
1. 2
1.3
1.4
is
2
2.1
2.2
2.3
Test items
Ying Liuxie
Pressure adjustment range
Iso-pressure endurance
(Opening and closing characteristics)
Test
Combined pressure test
Pressure loss test
Endurance test|| tt||Two-way buffer reading
Pressure adjustment range and pressure
force-determined test
equal pressure characteristics
high closing characteristics)
test face| |tt||Setting pressure difference
Complete version
One-way pressure
Loss test
Pressure loss of two-way oil supply valve
Test
Inside the combination valve block
Decontamination test
JB/T 6683-93
Table 5 test items and methods
Test||tt ||Check
Fang
Method"
Turn on the solenoid valve 8-6. Close the unloading circuit of the overflow 2-1. Adjust the overflow 2-1 so that The system pressure reaches 21MPa, turn on the reversing width 8-1, 8-5, then connect the 4-1 pressure oil circuit, adjust pump 1 to make the oil supply reach 30L/min. Carry out the following tests:| |tt||a.
b.
Adjust the tested valve 4-1, observe and record the value from the pressure gauge 3-5, until the required pressure adjustment pattern is adjusted; adjust Subject 4-1 reaches the adjusted pressure. Measure the pressure value from the pressure gauge 3-5. Repeat 3 times and take the average value. Subject 4-1 passes 30L/min oil and adjusts the medical force to the adjusted pressure. Set the pressure and adjust the flow 2-1. Record the pressure px value of the drum trial 4-1 with the overflow volume of 0.8L/min and the pressure value p when the flow is fully open: then adjust the relief valve 2-1 , gradually reduce the system pressure, record the pressure value P when the overflow volume of the tested valve 4-1 is 0.8L/min during the idle closing process, repeat the test 3 times, take the average value, and calculate the opening rate and closing rate. Trial reading 4-1 Through the oil flow of less than 4L/min, adjust the pressure to 1.25 times the set pressure, and maintain the pressure for 5 minutes. Observe whether there is oil leakage everywhere in the combined valve block
Trial reading 4-1 Through 30L/min oil, adjust the test reading 4-1 so that the pressure regulating spring of the valve is in a free state. Measure the pressure at the inlet and round oil port of the valve with pressure gauges 3-5 and 3-4. Repeat the test. 3 times, take the average value, calculate the pressure loss adjustment system 1 to make the oil supply volume 30L/min: turn on PCCW 8-6, close the unloading circuit of overflow 2-1, and adjust the overflow network 2- 1. Make the system pressure 16MPai and connect the reversing device 8-1 to connect the pressure oil circuit of 4-1: Continuously reverse the reversing device 8-5 at a rate of 20 to 40 times/min. , so that the number of impacts of subject 4-1 reaches 300,000 times, and then test various performance indicators of subject +-1
Adjust pump 1 so that the oil supply volume is 4L/min, and turn on the electromagnetic Valve 8-6. Close the unloading circuit of the relief valve 2-1, adjust the overflow valve 2-1 to make the system pressure reach 21MPa, and connect the reversing valves 8-1 and 8-2. Make the subject 4 Connect the pressure oil circuit of -2 or 4-3, and conduct the following tests respectively:
a. Adjust the distance between the test subject and 4-2 or 4-3, and observe the case from the pressure gauge 3-3 or 3-2. Record the value until the required pressure adjustment range is adjusted respectively;
b. Adjust the tested valve 4-2 or 4-3 to the set pressure, from the pressure gauge 3-3. or 3-2 Measure the pressure swing value, repeat it 3 times, and combine the average value
to adjust the system 1 so that the flow rate through the subject 4-2 or 4-3 is 4L/min, and the drum trial 4-2 or 4- 3 is at the set pressure. Adjust the flow meter 2-1. Record the pressure value pk when the overflow volume of 4-2 or 4-3 is 0.15L/min and the pressure value P when the flow is fully open, and then Adjust the overflow 2-1. Reduce the system pressure gradually + record the pressure value when the overflow is 0.15L/min during the closing process of the test 4-2 or 4-3. Repeat the test 3 times and take the Its approximate value, and calculate the opening rate and closing adjustment pump 1 supply volume is 4L/min, turn on the reversal 8-1 and 8-2. Connect the oil line of the tested valve 4-2 or 4-3. Pass, respectively adjust the health and government wind network + 20% to 4-3 to set the monitoring force, and adjust the pump 1 within the specified range so that the oil supply is 30L/min. .Connect the solenoid valve 8-6 to close the partial load circuit of the relief valve 2-1, then connect the solenoid valve 8-1, and measure the oil inlet and outlet of the valve 4-6 from the pressure gauge 3-6.3-5 The pressure value at the port, calculate the pressure loss adjustment system 1 to make the oil supply volume 8L/min, turn on the electromagnetic lubrication 8-6. Close the unloading circuit of the overflow 2-1, and then turn on the electromagnetic 8-1 .8-3, make sure the inlet pressure of 4-4 and 4-5 is correct, and adjust it to 2-2. Measure the pressure of 4-4 or 4 from the pressure gauge 3-4.3-2 or 3-5. -5 The pressure value of the inlet and outlet and the calculation of pressure loss shall be carried out according to the requirements of Appendix B
Note, 1) The codes in this column refer to Figure A1. 6
JB/T-6683-- 93
6.2.3 The internal cleanliness test of the combined reading block shall be conducted at least once every six months. 7 Inspection rules
According to different requirements, inspection is divided into two categories: type test and factory test. 7.1 Type test
7.1.1 Type test refers to a comprehensive inspection of the quality and performance of the combined block to identify the trial production Or test whether the produced combination block meets the standard requirements.
7.1.2 Type test must be carried out for any of the following situations:.
Trial production of combination valve block (including combination valve block transferred to factory): When the design, process or use of the combination valve block When changes in materials affect the performance of the combined reading block; b.
e
d.
When there is an unacceptable deviation between the results of the factory test and the previously conducted type test: A type test shall be carried out at least once every three years for mass-produced combination weighing blocks. The number of combined blocks for type testing is stipulated to be 3 units, one of which will be tested for the entire project, and the rest will only be used for performance testing. If there are 7.1.3
unqualified ones in the test, the number of tested pieces should be increased, such as If there are still unqualified parts, the type test of the combination block will be deemed as unqualified. 7.2 Factory test
7.2.1 Factory test refers to the test performed to inspect the quality of the combined block before leaving the factory. The factory test should be carried out by the relevant departments of the manufacturer. The combined valve block can only be shipped after passing the inspection.
7.2.2 Factory test items are divided into two categories: mandatory testing and random testing. During random testing, the number of products in the random testing items shall adopt a normal inspection one-time sampling plan in accordance with the provisions of GB2828. The qualified quality level (AQL) is 2.5. The inspection level is general inspection level 1. 7.2.3 Users have the right to re-inspect the quality of products according to the requirements of the factory must-test items. The sampling quantity is 1 head of the purchased batch, but not less than 2 units. If there are any unqualified products in the random inspection results, double the number of products will be re-sampled for testing. If there are still unqualified products, it will be deemed unqualified. 8 Test data
The test data is recorded in the record sheet. For the record sheet, please refer to Appendix C (reference part). 9 Marking and packaging
9.1 Mark
9.1.1 The design of the combined reading plate nameplate should be It should be beautiful and elegant, with clear lines, and should comply with the relevant regulations on the product nameplate. The nameplate should be installed squarely and firmly on an obvious part of the combined valve block. 9.1.2
The nameplate content should at least include:
9.1.3
Combined wide block name:
h.
c.||tt| |Main technical parameters of combined valve block:
Manufacturer name;
Xie import date or case number.
9.2 Packaging
9.2.1 Combined lubrication with plastic plugs at both ends. 9.2.2
a.
The following documents should be attached when the combined reading block is shipped from the factory and packed: Certificate section:
Instructions for use (including: component name, model, outline drawing, Installation and connection dimensions, structural diagram, main technical parameters, use b.
maintenance methods and spare parts detailed list, etc.):
c. Packing list.
All documents should be placed in plastic bags.
9.2.3. When packaging, the specified spare parts and combined female blocks should be packed together and firmly fixed in the box. 9.2.4 The packaging should be sturdy and durable, and have shockproof and moisture-proof measures. t
9.2. 5
a.
b.
c.
d.
e.
f .
8
JB/T6683-93
The following signs should be clearly marked on the outer wall of the packaging box: Product name and quantity:
Weight (kg): ||tt ||Manufacturer name;
Ordering unit name, address and destination name; Transportation precautions;
Packing year, month, day,
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