Some standard content:
GB17878-1999
This standard is formulated for use with GB17268-1998 "Non-refillable welded steel cylinders for industry". Appendix A of this standard is the appendix of the standard. This standard is proposed and managed by the National Technical Committee for Standardization of Gas Cylinders. The drafting unit of this standard: Juhua Group Engineering Co., Ltd. The main drafters of this standard: Ye Xiaoru, Zhou Hao, Fang Changqing, Zhang Yimin. 162
1 Scope
National Standard of the People's Republic of China
Non-refillable cylinder valve for industry
Non-refillable cylinder valve for industryGB17878-1999
This standard specifies the requirements, test methods, inspection rules, marking, packaging and storage and transportation of non-refillable cylinder valves for industry (hereinafter referred to as cylinder valves).
This standard is applicable to low-pressure liquefied gas cylinder valves with working temperature of -20~~60C and working pressure not more than 2.7MPa. 2 Referenced standards
The provisions contained in the following standards constitute the provisions of this standard through reference in this standard. When this standard is published, the versions shown are valid. All standards will be revised, and the parties using this standard should explore the possibility of using the latest versions of the following standards. GB/T699-1988 Technical conditions for high-quality carbon structural steel GB/T4423-1992 Copper and copper alloy drawn bars HG2233-1991 Copolymer acetal resin
HG2349-1992 Polyamide 1010 resin
ANSI B1.1-1998 Standard thread
ANSI B1.2—1997 Standard thread gauge and measurement 3 Requirements
3.1 Basic type structure and external dimensions requirements 3.1.1 The basic external shape and dimensions of the bottle valve are shown in Figure 1. 3.1.2 Under the condition that the bottle valve is not damaged, the type structure of the bottle valve should be able to prevent repeated filling by various means. 3.1.3 The thread of the bottle valve outlet is 0.4375-20UNF-2A, and the tooth angle is 60°. The thread should comply with the provisions of ANSIB1.1. Approved by the State Administration of Quality and Technical Supervision on October 10, 1999 and implemented on June 1, 2000
GB 17878—1999
we-ana
Inlet
Outlet
Figure 1 Basic shape and size of bottle valve
3.1.4 The nominal diameter of the bottle valve is greater than or equal to 4mm. 3.1.5 The total height of the bottle valve (closed state) shall not be greater than 70mm. 3.1.6 The valve body of the bottle valve is connected to the cylinder body in a non-detachable manner. 3.1.7 The full stroke of the valve stem when the bottle valve is opened and closed shall not be less than 3mm. 3.2 Material requirements
3.2.1 The materials of the main structural parts of the cylinder valve shall comply with the requirements of Table 1. When other materials are used, their performance shall not be lower than the standard requirements of the materials listed in Table 1.
Part name
Material name
HPb59-1
Polyamide 1010 resin
Copolymer acetal resin
3.2.2 The materials of the valve stem, valve core and rubber parts shall be compatible with the filling medium. 3.2.3 The material properties of rubber seals shall not be lower than the following requirements: a) Hardness 65 degrees ± 5 degrees (Shore A); b) Breaking strength not less than 9.8MPa; c) Breaking elongation not less than 250%; d) Permanent deformation rate not more than 10%; e) After soaking in liquefied chlorofluorocarbon at room temperature for 24 hours, the weight change rate is not more than 6%; f) Rubber seals should ensure normal operation at working temperature; g) At a compression rate of 20% and a temperature of -20°C, the compression cold resistance coefficient is not less than 0.3; in accordance with the standard GB/T 4423
GB/T699
HG2349
HG2233
h) After 24 hours at an air compression rate of 20% and a temperature of 100°C, the compression permanent deformation is not greater than 40%; i) After 24 hours in air at 100°C, the elongation aging coefficient is not greater than 0.75. 3.3 Processing requirements
3.3.1 The valve body shall be forged. There shall be no defects such as cracks, scars, pores, or misaligned molds on the surface of the valve body. 3.3.2 The outlet thread shall be inspected and qualified by the gauge of ANSIB1.2. 3.3.3 After processing, the valve body shall be treated to prevent corrosion from the filling medium and water, and shall meet the corresponding standard requirements after treatment. 164
GB 17878 -- 1999
3.3.4 The valve stem, valve core, etc. are injection molded and shall not have defects such as cold shut, charred material, impurities, pores, etc.; burrs, sharp edges and flashes shall be cleaned. 3.3.5 The flash of rubber seals shall be less than 0.07mm. 3.4 Performance requirements
3.4.1 Opening and closing
The opening and closing of the bottle valve shall be flexible at a working pressure of 2.7MPa and the opening and closing torque shall not exceed 3Nm. 3.4.2 Startability
When the bottle valve is opened at a working pressure of 0.5MPa, the medium shall be released smoothly. 3.4.3 Airtightness
At a working pressure of 2.7MPa, there shall be no leakage or other abnormal phenomena in any opening and closing position of the bottle valve. 3.4.4 Pressure resistance
The bottle valve shall not have leakage or other abnormal phenomena under the pressure of 4.0MPa. 3.4.5 Vibration resistance
The bottle valve shall be able to withstand vibration with an amplitude of 2mm, a frequency of 33.3Hz and a duration of 30mm under the working pressure of 2.7MPa, and shall not have leakage or other abnormal phenomena. 3.4.6 Temperature resistance
The bottle valve shall not have leakage or other abnormal phenomena within the temperature range of 20-60℃ under the working pressure of 2.7MPa. 3.4.7 Usability
The bottle valve shall be opened and closed 100 times in full stroke under the working pressure of 2.7MPa, and shall not have leakage or other abnormal phenomena. 3.4.8 Non-refillability
The bottle valve is repeatedly filled with medium under the pressure of 0.5MPa, and the weight of the medium allowed to be filled within 2h is not more than 5g. 4 Test method
4.1 Appearance inspection
The appearance of the bottle valve is inspected by visual inspection, and the result should meet the requirements of 3.3.1. 4.2 Opening and closing test
Install the bottle valve on a special device, fill air or nitrogen from the air inlet to 2.7MPa, close the bottle valve with a torque not greater than 3Nm, and immerse it in water for 1min without leakage; then the bottle valve can be opened smoothly with a torque not greater than 3Nm. 4.3 Start-up test
Install the bottle valve on a special device, fill air or nitrogen from the air inlet to 2.7MPa and then close it; then reduce the pressure to 0.5MPa and open the bottle valve, and the filled air or nitrogen should be released smoothly. 4.4 Air tightness test
Install the bottle valve on a special device for testing. 4.4.1 Block the air outlet, fill air or nitrogen from the air inlet to 2.7MPa and immerse in water for 30s. Check any open and closed position. There shall be no leakage or other abnormal phenomena. 4.4.2 Block the air inlet, fill air or nitrogen from the air outlet to 2.7MPa, close the bottle valve and immerse in water for 30s. There shall be no leakage or other abnormal phenomena.
4.5 Pressure test
Install the bottle valve on a special device, block the air outlet, make the bottle valve in the maximum open state, fill water and pressurize to 4.0MPa, maintain pressure for 3min, and there shall be no leakage or other abnormal phenomena. 4.6 Vibration resistance test
Install the bottle valve on a special device, fill air or nitrogen from the air outlet to 2.7MPa, close the bottle valve with a torque not greater than 3Nm, and vibrate up and down for 30min according to the requirements of 3.4.5. There shall be no leakage or other abnormal phenomena. 4.7 Temperature resistance test
GB 17878 1999
Install the bottle valve on a special device for testing, fill it with air or nitrogen and pressurize it to 2.7MPa, and install it in a high temperature box (60C±2C) and a low temperature box (20C±2℃) according to the requirements of 3.4.6 for 4h (open and close for 2h). There should be no leakage or other abnormal phenomena. 4.8 Durability test
Install the bottle valve on a special device, block the air outlet, fill it with air or nitrogen to 2.7MPa from the air inlet, open and close the bottle valve for 100 times at a full stroke at 6 to 10 times/min, and there should be no leakage or other abnormal phenomena. Then conduct the test according to the provisions of 4.3, and meet the requirements of 3.4.3.
For the non-repetitive filling test, see Appendix A (Appendix of the standard). 4.9
5 Inspection rules
5.1 Materials and parts entering the factory must have quality certificates and be inspected and accepted according to standards. 5.2 Type inspection
Inspection items are shown in Table 2.
Table 2 Type inspection items
Appearance inspection
Opening and closing test
Starting test
Air tightness test
Pressure resistance test
Vibration resistance test
Temperature resistance test
Durability test
Non-refillability test
5.2.2 Type inspection is generally carried out by the manufacturer according to needs, but it must be carried out in the following circumstances: a) When the newly designed cylinder valve is put into mass production; b) When the cylinder valve has major changes in design, process, materials, etc.; c) When the cylinder valve has accumulated years of production;
d) When the cylinder valve is put into production again after 6 months of suspension. Test method
5.2.3 The type inspection samples shall generally be 5 randomly selected from a batch of bottle valves produced recently (each batch shall not exceed 1,000). However, when type inspection is necessary, the inspection samples shall be randomly selected from the first batch of production products. 5.2.4 Judgment rules
During type inspection, when only one item and one sample are unqualified, double random sampling (10 pieces) is allowed to be re-inspected according to all items required by Table 2. If the re-inspection is unqualified, the type inspection is unqualified. If the type inspection is unqualified, the manufacturer shall not continue production, and shall improve the design and process, re-inspect the type and pass the inspection before it can be put into mass production. 5.3 Factory inspection
5.3.1 See Table 3 for inspection items.
Table 3 Factory inspection items
Appearance inspection
Inspection of air outlet thread
Inspection ratio
Test methodWww.bzxZ.net
Dimension of air inlet end
Air tightness test
Non-refillability test
GB 17878 - 1999
Table 3 (End)
Inspection ratio
2% and not less than 2 pieces
Negotiation between the supplier and the buyer
5.3.2 Batch rules
· An inspection batch can be composed of one production batch, or several production batches that meet the following conditions: a) These production batches are manufactured under basically the same conditions of materials, processes, equipment, etc.; b) The time for several production batches to constitute an inspection batch shall not normally exceed 1 day. Test method
5.3.3 Judgment and re-inspection rules
Among the factory inspection items, the appearance inspection, the air outlet thread inspection, the air inlet end and the bottle body connection size inspection, and the air tightness requirements must be inspected one by one and passed before they can leave the factory. The connection size of the air inlet and the bottle body is determined by negotiation between the supply and demand parties, but must comply with the principle of non-removability. When non-refillability appears in the sampling test and only 1 unqualified is found, 5 more samples are allowed to be drawn for re-inspection. If the number of unqualified products in a sampling test is greater than 1 or the re-inspection is still unqualified, the inspection batch of products is unqualified. 6 Marking, packaging and storage and transportation
6.1 Each bottle valve should be stamped with a qualified mark and inspection batch number. 6.2 Each inspection batch shall have a batch product quality certificate (batch product certificate), and the certificate or certificate shall indicate: a) manufacturer name;
b) product name and model;
c) standard number;
d) factory inspection mark and inspection date;
e) production date or batch number.
6.3 Valve packaging
6.3.1 Valves must be packaged. The threaded part is equipped with a plastic sleeve to protect the thread from damage and keep the valve body cavity and valve core clean. 6.3.2 Each box shall be accompanied by a product instruction manual and a packing list when packing. The packing list shall indicate: a) manufacturer name and address;
b) production batch number and inspection batch number;
c) valve name, model, quantity and unit weight. 6.3.3 Storage and transportation of valves
The valve should be placed in a dry place, away from high temperature areas, and should be loaded and unloaded gently during transportation to prevent heavy pressure and collision. 167
A1 Test equipment and process
A1.1 Basic requirements for test equipment
GB 17878
Appendix A
(Appendix to the standard)
Non-repetitive filling test
A1.1.1 The test equipment must have the function of regulating and controlling the pressure of the device system and maintaining the pressure continuously. A1.1.2 The test equipment must have the function of constant pressure and continuous output of the test medium. A1.1.3 The pressure-bearing system of the device must pass the pressure test. The pressure of the pressure test should not be less than twice the maximum working pressure allowed by the test device, and the pressure holding time of the pressure test shall not be less than 3 minutes. A1.1.4 At least two pressure gauges that can correctly display the test pressure at the same time should be installed on the test device. The accuracy level of the pressure gauge shall not be lower than 1.0, and its range shall be 2 to 3 times of the test pressure. The pressure gauge shall be calibrated once a year. A1.2 The process is shown in Figure A1, which is the recommended schematic diagram of the non-refillable test device. 1~- Gas source; 2- Pressure reducing valve; 3.7- Control valve; 4, 6- Pressure gauge 5- Water pressure tank; 8- Test bottle valve; 9 Water accumulation cup Figure A1 Schematic diagram of non-refillable test device A2 Test method
A2.1 The test pressure is 0.5MPa, and the test medium is generally water. A2.2 Test operation requirements
A2.2.1 After filling the water pressure tank with a sufficient amount of water, seal it, adjust the pressure of the test system to 0.5MPa and maintain constant pressure. A2.2.2 After the test bottle valve is closed once, open it to the maximum position. Then install the bottle valve upside down (with the air inlet facing up) on the water outlet joint of the device, open the water outlet valve and test until the test time is over. A2.2.3 After the test, pour the water in the water cup into the measuring cup to determine the filling volume. A2.2.4 During the test, check the pressure of the test system at any time and note whether the displayed values of the two pressure gauges are the same.2 Each inspection batch shall have a batch product quality certificate (batch product certificate), and the certificate or certificate shall indicate: a) manufacturer name;
b) product name and model;
c) standard number;
d) factory inspection mark and inspection date;
e) production date or batch number.
6.3 Valve packaging
6.3.1 Valves must be packaged. The threaded part is equipped with a plastic sleeve to protect the thread from damage and keep the inner cavity of the valve body and the valve core clean. 6.3.2 Each box shall be accompanied by a product instruction manual and a packing list when packing. The packing list shall indicate: a) manufacturer name and address;
b) production batch number and inspection batch number;
c) valve name, model, quantity and unit weight. 6.3.3 Storage and transportation of valves
The valve should be placed in a dry place, away from high temperature areas, and should be loaded and unloaded gently during transportation to prevent heavy pressure and collision. 167
A1 Test equipment and process
A1.1 Basic requirements for test equipment
GB 17878
Appendix A
(Appendix to the standard)
Non-repetitive filling test
A1.1.1 The test equipment must have the function of regulating and controlling the pressure of the device system and maintaining the pressure continuously. A1.1.2 The test equipment must have the function of constant pressure and continuous output of the test medium. A1.1.3 The pressure-bearing system of the device must pass the pressure test. The pressure of the pressure test should not be less than twice the maximum working pressure allowed by the test device, and the pressure holding time of the pressure test shall not be less than 3 minutes. A1.1.4 At least two pressure gauges that can correctly display the test pressure at the same time should be installed on the test device. The accuracy level of the pressure gauge shall not be lower than 1.0, and its range shall be 2 to 3 times of the test pressure. The pressure gauge shall be calibrated once a year. A1.2 The process is shown in Figure A1, which is the recommended schematic diagram of the non-refillable test device. 1~- Gas source; 2- Pressure reducing valve; 3.7- Control valve; 4, 6- Pressure gauge 5- Water pressure tank; 8- Test bottle valve; 9 Water accumulation cup Figure A1 Schematic diagram of non-refillable test device A2 Test method
A2.1 The test pressure is 0.5MPa, and the test medium is generally water. A2.2 Test operation requirements
A2.2.1 After filling the water pressure tank with a sufficient amount of water, seal it, adjust the pressure of the test system to 0.5MPa and maintain constant pressure. A2.2.2 After the test bottle valve is closed once, open it to the maximum position. Then install the bottle valve upside down (with the air inlet facing up) on the water outlet joint of the device, open the water outlet valve and test until the test time is over. A2.2.3 After the test, pour the water in the water cup into the measuring cup to determine the filling volume. A2.2.4 During the test, check the pressure of the test system at any time and note whether the displayed values of the two pressure gauges are the same.2 Each inspection batch shall have a batch product quality certificate (batch product certificate), and the certificate or certificate shall indicate: a) manufacturer name;
b) product name and model;
c) standard number;
d) factory inspection mark and inspection date;
e) production date or batch number.
6.3 Valve packaging
6.3.1 Valves must be packaged. The threaded part is equipped with a plastic sleeve to protect the thread from damage and keep the inner cavity of the valve body and the valve core clean. 6.3.2 Each box shall be accompanied by a product instruction manual and a packing list when packing. The packing list shall indicate: a) manufacturer name and address;
b) production batch number and inspection batch number;
c) valve name, model, quantity and unit weight. 6.3.3 Storage and transportation of valves
The valve should be placed in a dry place, away from high temperature areas, and should be loaded and unloaded gently during transportation to prevent heavy pressure and collision. 167
A1 Test equipment and process
A1.1 Basic requirements for test equipment
GB 17878
Appendix A
(Appendix to the standard)
Non-repetitive filling test
A1.1.1 The test equipment must have the function of regulating and controlling the pressure of the device system and maintaining the pressure continuously. A1.1.2 The test equipment must have the function of constant pressure and continuous output of the test medium. A1.1.3 The pressure-bearing system of the device must pass the pressure test. The pressure of the pressure test should not be less than twice the maximum working pressure allowed by the test device, and the pressure holding time of the pressure test shall not be less than 3 minutes. A1.1.4 At least two pressure gauges that can correctly display the test pressure at the same time should be installed on the test device. The accuracy level of the pressure gauge shall not be lower than 1.0, and its range shall be 2 to 3 times of the test pressure. The pressure gauge shall be calibrated once a year. A1.2 The process is shown in Figure A1, which is the recommended schematic diagram of the non-refillable test device. 1~- Gas source; 2- Pressure reducing valve; 3.7- Control valve; 4, 6- Pressure gauge 5- Water pressure tank; 8- Test bottle valve; 9 Water accumulation cup Figure A1 Schematic diagram of non-refillable test device A2 Test method
A2.1 The test pressure is 0.5MPa, and the test medium is generally water. A2.2 Test operation requirements
A2.2.1 After filling the water pressure tank with a sufficient amount of water, seal it, adjust the pressure of the test system to 0.5MPa and maintain constant pressure. A2.2.2 After the test bottle valve is closed once, open it to the maximum position. Then install the bottle valve upside down (with the air inlet facing up) on the water outlet joint of the device, open the water outlet valve and test until the test time is over. A2.2.3 After the test, pour the water in the water cup into the measuring cup to determine the filling volume. A2.2.4 During the test, check the pressure of the test system at any time and note whether the displayed values of the two pressure gauges are the same.
Tip: This standard content only shows part of the intercepted content of the complete standard. If you need the complete standard, please go to the top to download the complete standard document for free.