JB/T 9840.2-1998 Technical requirements for air brake valves in air brake systems for tractor trailers
Some standard content:
ICS65.060.10
Machinery Industry Standard of the People's Republic of China
[B/T9840.2-1998
Brake valve for pneumatic braking system of tractor trailer-Technical reqirement1998-09-30Published
Jiajia Machinery Industry Bureau
1998-12-01 Implementation
Old 9840.2-1998
This standard is a revision of 7.B66002-9 "Technical requirements for pneumatic brake system of tractor trailer", and incorporates the relevant provisions of ZET66001.2-89 "Series of parameters of pneumatic brake system components of tractor trailer" into this standard. From the date of implementation, this standard will replace ZBT66002-B9 and ZBT66001.2-89. This standard is proposed and managed by the National Technical Committee for Standardization of Pitumatic Braking Machines. The unit of this standard is Luoyang Pitumatic Braking Research Institute. The main drafter of this standard is Ma En:
Machinery Industry Standard of the People's Republic of China
Technical requirements for pneumatic brake valves for pitumatic braking systems of tractor trailers
Technical requirements for pneumatic brake valves for pitumatic braking systems of tractor trailers reqirementB9B40.2-1998
2BT65002-89
ZB T66 00[,2~89
This standard specifies the technical requirements, test methods, inspection rules, marking, installation, transportation and storage of the air brake valve of the air brake system of the crane trailer.
This standard is applicable to the air brake valve of the air brake system of the crane trailer. 2
Cited standards
The following standards contain clauses, which constitute the clauses of this standard through reference in this standard. When this standard is published, the versions shown are valid, and all versions will be revised. The latest version of the listed standards should be used when using the standard. GB82#87
Batch inspection counting sampling procedure must be sampled (applicable to continuous Inspection of renewal of approval) CiA/T1338492 Technical requirements for pressure relief of electromechanical products packaging JD/T5673-91 Series parameters General technical conditions for agricultural and forestry standard machinery and its painting General technical conditions for tractor suspension air brake system Air brake component measurement parameters Table 1 QFI-GG30 Nominal reaction force kPa Nominal diameter Total nominal volume of brake air L 4 Technical requirements QFJ-&/630 4.1 Air brake components shall be manufactured in accordance with the product samples and technical documents approved by the specified procedures. QrI-1G630
4.2 The surface of the air brake valve should be smooth and smooth, without flash and roughness. The metal beryllium layer and the oxidation treatment layer should not fall off or rust. The painted surface should meet the requirements of TQ-2-2 of JB/T56. 4.3 The operating temperature of the air brake valve is between -30~70%. 4.4 Performance
4.4.1 The minimum pressure of the air brake valve is between 20 kPa. 4.4.2 Static performance
4.4.2.1 The static performance should meet the requirements. The minimum balance pressure shall not be greater than 50kPa. Approved by the State Machinery Industry Bureau on September 3, 1998: Inspection. JB/I9840.2—1998. 4.4.2.2. Within the specified range: the input pressure and the push rod (whistle core or pull arm) stroke and the push rod (pedal or pull arm) force shall remain constant. 4.4.3 Animal nature. 4.4.3.1 Brushing back-to-bottom attachment time. When the brake operating mechanism begins to work, the test shall use the maximum allowable matching brake air chamber nominal volume. The storage volume shall meet the requirements of Table 1. The time required for the pressure to rise from zero to 75% of the nominal pressure shall not exceed .5s. 4.4.3.2 Release drive time
When the brake belt mechanism starts to work, the volume of the gas tank with the maximum nominal capacity of the brake air chamber used in the test should be as specified in Table [, and the time required for the force to drop from 630kPa to 10% of the nominal pressure shall not be greater than 1s. 4.4.4 Lightning resistance
4.4.4, 1 air brake valve and 11L gas tank are connected, in the brake release state, under nominal pressure, the pressure drop within 5m should not be more than +15kPa
4.4.4.1 The air brake valve and 1L gas tank are connected, in the full braking state, under nominal pressure, the pressure drop within 5m should not be more than F30kPa,
4.4.5 Pressure resistance test of normal parts
At 125% of the nominal pressure, after 30 action cycles of bench pressure resistance test, no part shall fail, and the sealing shall comply with the requirements of 4.4.4.
4. 4. 6 Durability
After the air brake steel ratio 25×10° action balance ring durability test, the uniformity reduction test force drop is not more than twice the value specified in 4.4.4. The dynamic characteristics should meet the requirements of 4.4.3. 4.s Warranty period
Under the condition that the manufacturer complies with the installation, maintenance and use regulations specified in the instruction manual of the tractor air brake device, the warranty period is the same as the warranty period of the main engine.
During the warranty period, if the air brake fails or is used incorrectly, the manufacturer shall be responsible for repair, replacement and refund.
5 Test method
S. Nominal pressure test
5. 1. 1 Test quantity
The schematic diagram of the test device is shown in 1.
1-1; 2-2; 3-Start and end; 4-11 Gas storage amount: 5-2-3; 6-Loading and stopping time: 7-Gas condition 1 adjustment: Linkage: A
Figure 1 "Nominal pressure test device schematic diagram
JB/T9840.2-1998
S.1.2 Air brake test range: Adjust the air brake pressure in Figure 1, so that the air brake head is in the state of releasing the brake, and the distance between the seat and the seat is still 1.5~2.5mm; then release or slightly move the limit stop Ⅱ and the A-control lamp, so that the air brake valve in the full brake state outputs gas at the nominal pressure value 5.1.3 Repeat the air brake valve at the full brake state, and its output pressure must be the nominal pressure value that is stable. 5.2 Brake light switch on and off test
5.2.1 Connect the brake light switch 11 to a circuit with a voltage of 12V and a current of 5A, and gradually increase the stroke of the operating lever (pedal or pull) from zero to the maximum. When the pressure change (rate 1) is within the range of 2(-kPa), the brake light switch should be turned on. 5.2.2 During the negative stroke (pedal or pull), the pressure change (rate 1) should gradually decrease to the maximum. When the pressure reading is lower than the range of 20~80kPa, the brake light switch should be turned on.
5.3 Static test
5.3.1 Test equipment
The schematic diagram of the test instrument is shown in Figure 2.
1—air, 2—adjustment time: 3—quality: 4—actual reference force instrument: displacement sensor, 6—addition: 7—transmitter:—air brake, 9—storage (each) Figure 2 Schematic diagram of static test equipment
5.3.2 Test conditions
5.3.2.1 The standard force instrument is not less than U.4 level, and its upper limit is not more than 2.5 of the test stop force. 5.3.2.2 The accuracy of the sensor and the recorder should ensure that the error of the measured value is not greater than 3%. 5.3.2.3 The air brake input air is stable at B0kPa+20kPa. 5.3.3 Take the air and increase the travel of the push rod (sinking or position) to the limit. Under each state, record the relationship between the air pressure and the push (with plate or pull) travel S and the pull rod (stepping plate or pressing force). Repeat the test twice. 5.3.4 Test result processing
5.3.1 performance test The results are averaged and plotted as curves (except for those that are directly recorded). The curves are shown in Figure 3. The lowest 7 micro-gas Pm and the highest output gas are marked on the curves, and the input gas is given. teripa
screen
Figure 3 Single-chamber air brake valve static characteristic curve diagram 5.4 Dynamic characteristic test
5.4.1 Monitoring device
Schematic diagram of the test device is shown in Figure 4
JB/T9840.2-1998
1—gas source; 2—Hello chart: 3—standard pressure gauge: 4—gas tank (one for each control), 5—transfer device: a 2mm long, 2mm inner diameter short pipe, 7—efficiency device: 8—force sensor: 9—gas resistance: 10—through head: 1—9# automatic alarm 350m each, 12mm inner diameter 12—1 gas follower (two for each original): 13—H sensor diagram 4 dynamic characteristics test device declaration general diagram
5. 4. 2 Test conditions
5.4.2.1 Same as 5.3.21 and 5.3.2.2,
5, 4, 2.2 Same as 5.1.2.3g
5.4.2.3 The inner diameter of each joint of the test device is 10. 5.4.3 Turn on the air source, and the pedal (road plate or pull arm) moves to the full stroke at the fastest speed, and record the relationship between the output air pressure β and time.
5.4.4 When the air brake is in full braking state and its output reaches the maximum value, quickly return the pedal cup (pedal arm) to the release brake position, and record the relationship between the output air pressure and time. 3.4.5 Test results and treatment
5.4.5.1 Draw the test results of 5.4.3 and 5.4.4 into a dynamic characteristic curve (except for recording the dynamic characteristics directly by the line). See Figure 5 for the dynamic characteristic curve diagram. The time coordinate is calculated from the time of pushing (stepping on or pulling) the external movement. p:aPe
Read 5 single air shell dynamic characteristic curve diagram JB/T9840.2-1997
S.4.S.2 According to the test results of 5.4.3 and 5.4.4, determine A, (A: A,2, B, B, H,), C. (C, C,) on the curve, or mark the time interval (). (: (see Figure 5) A: The point where the output pressure reaches 75% of Pm:||tt ||B: The point where the push starts to return;
C: The point where the output pressure drops to 1U%pP; t: The time interval from the start of the movement of the middle plate (plate or arm) to the output pressure reaching 75%P;,: The time interval from the start of the movement of the inner plate (sunken plate or arm) to the output pressure dropping to 10% of the output pressure: 1, 2, 1 are the numbers of the 1.2.3 chambers of the gas-tight valve. 5.5 Time test
5.5.1 Test device
The schematic diagram of the test device is shown in Figure 6.
【—source; 2-pressure regulating network; 3-pressure regulating network: 411 gas storage tank; 5-standard 4 pressure gauge: 6-stop valve; 7-pressure regulating network Figure 6 Sealing test device schematic diagram
5.5.2 Test conditions
5, 5.2.1 Same as 5.3.2.1.
5.5.2.2 Seal the remaining air outlets. 5.5.2.3 Test pressure, not less than the nominal pressure of the air brake. 5.5.2.4 The sealing device is not allowed to lose air
5..3 Release the pneumatic state of the air brake, input compressed air to its air intake: 1: close the stop valve 3 (see Figure 6) and determine the sealing index of the test air brake under the release of the pneumatic state. 5.5.4 Put the air brake in the full braking state, input compressed air to its air port, close the stop valve 6 (see Figure 6), and measure the sealing index of the test pneumatic valve under the full braking state. 5.6 Endurance test
5.6.1 Inspection
The test is carried out on a special joint depth.
5. 6.2 Test conditions
5.6.2.1 The test pressure shall not be less than 125% of the pressure of the pneumatic valve. 5.6.2.2 Note: The action frequency of the valve (push or protector) is 15~30 times/m, and the action mode is to act in the manner of quick action-pressure maintenance-rapid release. The air pressure value of the pneumatic valve during the pressure maintenance period shall comply with the provisions of 5.6.2.1. 5.6.3 Perform the over-sequence sealing test according to 5.5. The test pressure shall comply with the provisions of 5.6.2.1. Regulations, JB/T9840.2-1999
5.6.4 Continuous action is not less than 30 cycles, observe the working conditions of the air brake, 5.6.5 Same as 5.6.3,
, 66XiS three-way static special shock test,
5.6.7 Treatment of test results
5.6.7.1 Determine the sealing index according to the test results of 56.3 and 5.6.5, 5.6.7.2 Check the static characteristics according to the test results of 56.6. 5.6.3 If necessary, disassemble the air brake valve and check the required parts. 5.7 Endurance test
5. 7. 1 Test device
The test is carried out on a special test bench.
5.7.1 Test conditions
Test conditions shall be in accordance with the provisions of 53.2.3
5.7.3 Carry out 25×1 action cycles according to the provisions of 5.6.2.2. During the test, the output pressure of the air brake network shall meet the requirements of 5.3.2.3. 5.7.4 Continuous action and number of times,
5.7.5 During the test or in accordance with the provisions of 5.5, regular inspections shall be carried out. The interval between two adjacent inspections shall not exceed 5×10 action cycles. 5.6 The test shall be terminated when any of the following situations occurs: and the total number of tests shall be recorded:) Basic parts are damaged:
b! The sealing effect may cause the assembly tightness index to exceed 60kPa in the brake release state and the full dynamic state. 5.7.7 Test results The life of the parts and the life of the air brake valve shall be determined according to the test results of 5.7.5 and 5.7.6. 6 Inspection rules 6.1 Inspection Each air brake valve product shall be inspected by the quality inspection department of the manufacturer before it can be inspected. The inspection items shall be in accordance with the provisions of 2. Table 2
Release pressure
6.2 Type test
Closeness
Minimum production pressure
Judgement of dynamic reaction
Responding when releasing the brake
Total brake ratio
Release dynamic state sound
Individual dynamic state sealing
Release brake state dust
Minimum brake light standard ||t t||The relevant crown can be used for light
Type test In general, the floating connection GB2828 standard is required to be selected for pre-inspection, and the drainage plan and the total determination shall be carried out in accordance with the provisions of 6
FB/T9840.2-1998
Product grade classification standard, or it can be inspected according to the sampling method agreed upon by the supply and demand parties, 7. Marking, packaging, transportation and storage
7! The requirements of the product mark include: a) manufacturer name and address: b) product name: s) product model or mark: d) manufacturing date (or number) or production number. 2 The packaging of the air brake valve shall comply with the provisions of GBT13384. The air brake valve shall at least provide the following technical documents: a) product instruction manual: b) product certificate: e) packing list: d) packing list. 3. The air brake valve shall not be damaged or lost in normal transportation. 4. The air brake valve shall be stored in a ventilated and properly warehouse to ensure that it is delivered on the date of delivery. The product shall not be rusted or damaged due to the special requirements of the supply and demand.) only about the cover, or mark the time interval (). (: (See Figure 5) A: The point where the output pressure reaches 75%Pm:
B: The point where the push starts to return;
C: The point where the output pressure drops to 1U%pP; t: The time interval from the start of the movement of the middle plate (plate or arm) to the output pressure reaching 75%P; t: The time interval from the start of the movement of the inner plate (sunken plate or arm) to the output pressure dropping to 10% of the pressure; 1, 2, 1 are the serial numbers of the 1.2.3 chambers of the gas valve. 5.5 Time test
5.5.1 Test device
The schematic diagram of the test device is shown in Figure 6.
[— source; 2- pressure regulating network; 3 network: 411 gas storage tank; 5- standard 4 pressure gauge: 6- stop valve; 7- control or Figure 6 Sealing test device schematic diagram
5.5.2 Test conditions
5, 5.2.1 Same as 5.3.2.1.
5.5.2.2 Seal the remaining air outlets. 5.5.2.3 Test pressure, not less than the nominal pressure of the air brake. 5.5.2.4 The sealing device is not allowed to lose air
5..3 Release the pneumatic state of the air brake, input compressed air to its air intake: 1: close the stop valve 3 (see Figure 6) and determine the sealing index of the test air brake under the release of the pneumatic state. 5.5.4 Put the air brake in the full braking state, input compressed air to its air port, close the stop valve 6 (see Figure 6), and measure the sealing index of the test pneumatic valve under the full braking state. 5.6 Endurance test
5.6.1 Inspection
The test is carried out on a special joint.
5. 6.2 Test conditions
5.6.2.1 The test pressure shall not be less than 125% of the pressure of the pneumatic valve. 5.6.2.2 Note: The action frequency of the pneumatic valve (push or protector) is 15~30 times/m, and the action mode is the method of quick action-pressure maintenance-rapid release. The air pressure value of the pneumatic valve during the pressure maintenance period shall comply with the provisions of 5.6.2.1. 5.6.3 Perform the over-sequence sealing reduction test according to 5.5. The test pressure shall comply with the provisions of 5.6.2.1, JB/T9840.2-1999
5.6.4 The continuous action shall be no less than 30 cycles, and the working condition of the air brake shall be observed. 5.6.5 The static characteristics test shall be carried out in accordance with 5.6.3,
, and 66.5.
5.6.7 Treatment of test results
5.6.7.1 Determine the sealing index according to the test results of 56.3 and 5.6.5. 5.6.7.2 Check the static characteristics according to the test results of 56.6. 5.6.3 If necessary, disassemble the air brake valve and inspect the required parts. 5.7 Endurance test
5. 7. 1 Test device
The test is carried out on a special test bench.
5.7.1 Test conditions
Test conditions shall be in accordance with the provisions of 53.2.3
5.7.3 Carry out 25×1 action cycles according to the provisions of 5.6.2.2. During the test, the output pressure of the air brake network shall meet the requirements of 5.3.2.3. 5.7.4 Continuous action and number of times,
5.7.5 During the test or in accordance with the provisions of 5.5, regular inspections shall be carried out. The interval between two adjacent inspections shall not exceed 5×10 action cycles. 5.6 The test shall be terminated when any of the following situations occurs: and the total number of tests shall be recorded:) Basic parts are damaged:
b! The sealing effect may cause the assembly tightness index to exceed 60kPa in the brake release state and the full dynamic state. 5.7.7 Test results The life of the parts and the life of the air brake valve shall be determined according to the test results of 5.7.5 and 5.7.6. 6 Inspection rules 6.1 Inspection Each air brake valve product shall be inspected by the quality inspection department of the manufacturer before it can be inspected. The inspection items shall be in accordance with the provisions of 2. Table 2
Release pressure
6.2 Type test
Closeness
Minimum production pressure
Judgement of dynamic reaction
Responding when releasing the brake
Total brake ratio
Release dynamic state sound
Individual dynamic state sealing
Release brake state dust
Minimum brake light standard ||t t||The relevant crown can be used for lightWww.bzxZ.net
Type test In general, the floating connection GB2828 standard is required to be selected for pre-inspection, and the drainage plan and the total determination shall be carried out in accordance with the provisions of 6
FB/T9840.2-1998
Product grade classification standard, or it can be inspected according to the sampling method agreed upon by the supply and demand parties, 7. Marking, packaging, transportation and storage
7! The requirements of the product mark include: a) manufacturer name and address: b) product name: s) product model or mark: d) manufacturing date (or number) or production number. 2 The packaging of the air brake valve shall comply with the provisions of GBT13384. The air brake valve shall at least provide the following technical documents: a) product instruction manual: b) product certificate: e) packing list: d) packing list. 3. Ensure that the air brake valve will not be damaged or lost during normal transportation. 4. The air brake valve shall be stored in a ventilated and properly warehouse to ensure that the product is delivered on time. The product shall not be rusted or damaged due to the special requirements of the supply and demand.) only about the cover, or mark the time interval (). (: (See Figure 5) A: The point where the output pressure reaches 75%Pm:
B: The point where the push starts to return;
C: The point where the output pressure drops to 1U%pP; t: The time interval from the start of the movement of the middle plate (plate or arm) to the output pressure reaching 75%P; t: The time interval from the start of the movement of the inner plate (sunken plate or arm) to the output pressure dropping to 10% of the pressure; 1, 2, 1 are the serial numbers of the 1.2.3 chambers of the gas valve. 5.5 Time test
5.5.1 Test device
The schematic diagram of the test device is shown in Figure 6.
[— source; 2- pressure regulating network; 3 network: 411 gas storage tank; 5- standard 4 pressure gauge: 6- stop valve; 7- control or Figure 6 Sealing test device schematic diagram
5.5.2 Test conditions
5, 5.2.1 Same as 5.3.2.1.
5.5.2.2 Seal the remaining air outlets. 5.5.2.3 Test pressure, not less than the nominal pressure of the air brake. 5.5.2.4 The sealing device is not allowed to lose air
5..3 Release the pneumatic state of the air brake, input compressed air to its air intake: 1: close the stop valve 3 (see Figure 6) and determine the sealing index of the test air brake under the release of the pneumatic state. 5.5.4 Put the air brake in the full braking state, input compressed air to its air port, close the stop valve 6 (see Figure 6), and measure the sealing index of the test pneumatic valve under the full braking state. 5.6 Endurance test
5.6.1 Inspection
The test is carried out on a special joint.
5. 6.2 Test conditions
5.6.2.1 The test pressure shall not be less than 125% of the pressure of the pneumatic valve. 5.6.2.2 Note: The action frequency of the pneumatic valve (push or protector) is 15~30 times/m, and the action mode is the method of quick action-pressure maintenance-rapid release. The air pressure value of the pneumatic valve during the pressure maintenance period shall comply with the provisions of 5.6.2.1. 5.6.3 Perform the over-sequence sealing reduction test according to 5.5. The test pressure shall comply with the provisions of 5.6.2.1, JB/T9840.2-1999
5.6.4 The continuous action shall be no less than 30 cycles, and the working condition of the air brake shall be observed. 5.6.5 The static characteristics test shall be carried out in accordance with 5.6.3,
, and 66.5.
5.6.7 Treatment of test results
5.6.7.1 Determine the sealing index according to the test results of 56.3 and 5.6.5. 5.6.7.2 Check the static characteristics according to the test results of 56.6. 5.6.3 If necessary, disassemble the air brake valve and inspect the required parts. 5.7 Endurance test
5. 7. 1 Test device
The test is carried out on a special test bench.
5.7.1 Test conditions
Test conditions shall be in accordance with the provisions of 53.2.3
5.7.3 Carry out 25×1 action cycles according to the provisions of 5.6.2.2. During the test, the output pressure of the air brake network shall meet the requirements of 5.3.2.3. 5.7.4 Continuous action and number of times,
5.7.5 During the test or in accordance with the provisions of 5.5, regular inspections shall be carried out. The interval between two adjacent inspections shall not exceed 5×10 action cycles. 5.6 The test shall be terminated when any of the following situations occurs: and the total number of tests shall be recorded:) Basic parts are damaged:
b! The sealing effect may cause the assembly tightness index to exceed 60kPa in the brake release state and the full dynamic state. 5.7.7 Test results The life of the parts and the life of the air brake valve shall be determined according to the test results of 5.7.5 and 5.7.6. 6 Inspection rules 6.1 Inspection Each air brake valve product shall be inspected by the quality inspection department of the manufacturer before it can be inspected. The inspection items shall be in accordance with the provisions of 2. Table 2
Release pressure
6.2 Type test
Closeness
Minimum production pressure
Judgement of dynamic reaction
Responding when releasing the brake
Total brake ratio
Release dynamic state sound
Individual dynamic state sealing
Release brake state dust
Minimum brake light standard ||t t||The relevant crown can be used for light
Type test In general, the floating connection GB2828 standard is required to be selected for pre-inspection, and the drainage plan and the total determination shall be carried out in accordance with the provisions of 6
FB/T9840.2-1998
Product grade classification standard, or it can be inspected according to the sampling method agreed upon by the supply and demand parties, 7. Marking, packaging, transportation and storage
7! The requirements of the product mark include: a) manufacturer name and address: b) product name: s) product model or mark: d) manufacturing date (or number) or production number. 2 The packaging of the air brake valve shall comply with the provisions of GBT13384. The air brake valve shall at least provide the following technical documents: a) product instruction manual: b) product certificate: e) packing list: d) packing list. 3. Ensure that the air brake valve will not be damaged or lost during normal transportation. 4. The air brake valve shall be stored in a ventilated and properly warehouse to ensure that the product is delivered on time. The product shall not be rusted or damaged due to the special requirements of the supply and demand.1. Inspection
Each air brake valve product can be inspected by the quality inspection department of the manufacturer before it can be inspected! The inspection items shall be in accordance with the provisions of 2. Table 2
General test
6.2 Form test
Tightness
Minimum pressure
Judgement of dynamic reaction
Return when releasing the brake
Total brake ratio
Release dynamic state sound
Individual dynamic state tightness
Release brake state tightness
Release brake state dust
Minimum brake light standard ||t t||The relevant crown can be used for light
Type test In general, the floating connection GB2828 standard is required to be selected for pre-inspection, and the drainage plan and the total determination shall be carried out in accordance with the provisions of 6
FB/T9840.2-1998
Product grade classification standard, or it can be inspected according to the sampling method agreed upon by the supply and demand parties, 7. Marking, packaging, transportation and storage
7! The requirements of the product mark include: a) manufacturer name and address: b) product name: s) product model or mark: d) manufacturing date (or number) or production number. 2 The packaging of the air brake valve shall comply with the provisions of GBT13384. The air brake valve shall at least provide the following technical documents: a) product instruction manual: b) product certificate: e) packing list: d) packing list. 3. The air brake valve shall not be damaged or lost in normal transportation. 4. The air brake valve shall be stored in a ventilated and properly warehouse to ensure that it is delivered on the date of delivery. The product shall not be rusted or damaged due to the special requirements of the supply and demand.1. Inspection
Each air brake valve product can be inspected by the quality inspection department of the manufacturer before it can be inspected! The inspection items shall be in accordance with the provisions of 2. Table 2
General test
6.2 Form test
Tightness
Minimum pressure
Judgement of dynamic reaction
Return when releasing the brake
Total brake ratio
Release dynamic state sound
Individual dynamic state tightness
Release brake state tightness
Release brake state dust
Minimum brake light standard ||t t||The relevant crown can be used for light
Type test In general, the floating connection GB2828 standard is required to be selected for pre-inspection, and the drainage plan and the total determination shall be carried out in accordance with the provisions of 6
FB/T9840.2-1998
Product grade classification standard, or it can be inspected according to the sampling method agreed upon by the supply and demand parties, 7. Marking, packaging, transportation and storage
7! The requirements of the product mark include: a) manufacturer name and address: b) product name: s) product model or mark: d) manufacturing date (or number) or production number. 2 The packaging of the air brake valve shall comply with the provisions of GBT13384. The air brake valve shall at least provide the following technical documents: a) product instruction manual: b) product certificate: e) packing list: d) packing list. 3. Ensure that the air brake valve will not be damaged or lost during normal transportation. 4. The air brake valve shall be stored in a ventilated and properly warehouse to ensure that the product is delivered on time. The product shall not be rusted or damaged due to the special requirements of the supply and demand.
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