Some standard content:
National Standard of the People's Republic of China
General Technical Specifications for Cylinder Vaives
General Technical Specifications for Cylinder Vaives1 Subject Content and Scope of Application
GB1538294
This standard specifies the basic structure of cylinder valves, the connection type and size of the inlet and outlet ports, technical requirements, inspection and test methods, inspection rules and markings, packaging, transportation and storage.
This standard applies to cylinder valves (hereinafter referred to as valves) used on refillable mobile gas cylinders with an ambient temperature of -40 to +60°C and a nominal working pressure of 0.1 to 30 MPa.
This standard does not apply to valves with special safety requirements for the toxicity, corrosiveness, and spontaneous combustion of the gas contained in the cylinder. Note: The pressure in this standard refers to the gauge pressure.
2 Reference standards
Technical conditions for cast aluminium alloys
GB 1173
GB4425
GB5232
Lead brass rods
Processing brass-Chemical composition and product shape GB8335
Special threads for gas cylinders
GB8336
Special thread gauges for gas cylinders
GB 8337
Fusible alloy plugs for gas cylinders
GB 10922
Non-thread seal pipe thread gauges
Gas cylinder valve outlet connection types and dimensions
GB 15383
3 Basic structure and inlet and outlet connection types and dimensions 3.1 Basic structure of valves: diaphragm type, needle type and other types. 3.2 The valve inlet connection taper thread shall comply with GB8335. 3.3 The valve outlet connection type and size shall comply with GB15383. 4 Technical requirements
41 Materials
4.1.1 For toxic or corrosive gases, the valve shall be made of materials that do not chemically react with the gas in the bottle and do not affect the quality of the gas. 4.1.2 The non-metallic sealing materials used in the valve must be compatible with the medium used and shall comply with the relevant standards. 4.1.3 The valve body and main parts are generally made of HPb59-1 lead brass or materials with performance not lower than it. The chemical composition of HPb59-1 lead brass shall comply with GB5232; the mechanical properties shall comply with GB4425. When there are special requirements for the materials selected for the valve, they shall comply with the relevant standards.
4.1.4 The handwheel shall be made of metal materials, generally ZL102 aluminum alloy, and its chemical composition and mechanical properties shall comply with the provisions of GB1173. Other metal materials shall comply with the corresponding standards. Approved by the State Bureau of Technical Supervision on December 26, 1994 132
Implementation on August 1, 1995
4.2 Appearance requirements
GB 15382--94
The valve body shall not have defects such as cracks, folds, overburning, inclusions, etc., and the handwheel shall not have sharp edges or burrs. 4.3 Performance requirements
4.3.1 Opening and closing torque
Under the nominal working pressure, the maximum opening and closing torque of the needle-shaped valve shall not exceed 12N·m. When other structures are used, the maximum opening and closing torque shall not exceed 7N·m.
4.3.2 Air tightness
Under the nominal working pressure or 1.1 times the nominal working pressure or the specific pressure, there shall be no leakage when the valve is in the closed and any open state.
4.3.3 Vibration resistance
Under the nominal working pressure, the valve shall be able to withstand vibration with a frequency of 33%Hz and an amplitude of 2mm, and all valve connections shall be free of looseness and leakage.
4.3.4 Temperature resistance
Under the nominal working pressure, the valve shall not leak within a temperature range of 40 to 60℃. 4.3.5 Pressure resistance
Under 1.5 times the nominal working pressure, there shall be no leakage and other abnormal phenomena when the valve is in the open state. 4.3.6 Durability
Under the nominal working pressure, according to the specified torque, the full stroke opening and closing valve and the durability times shall comply with the provisions of the following table. Durability times table
Diaphragm type
Needle type
Other types
4.3.7 Safety device
Opening and closing times of full stroke
There should be no leakage and other abnormal phenomena
Valves used for extremely toxic or highly hazardous gases are prohibited from being equipped with various types of safety devices. Fusible alloys cannot react chemically with the gas in the bottle. It is also not allowed to affect the quality of the gas. The safety devices installed on the valve are of the following types: a. Fusible alloy type safety devices are in accordance with GB8337. b. Bursting disc type safety devices should operate within the range of 1.2 to 1.5 times the nominal working pressure. 4.3.8 Vacuum degree
Valves for inert gases and high-purity gases should have vacuum degree requirements, and their vacuum degree should not be less than 0.980532×10-6MPa. 5 Inspection and test methods
5.1 Appearance inspection
The appearance shall be inspected visually and shall comply with the provisions of Article 4.2. 5.2 Connection thread inspection
The air inlet connection thread shall be inspected with a gauge manufactured in accordance with GB8336. The air outlet cylindrical pipe thread shall be inspected with a gauge manufactured in accordance with GB10922. 5.3 Opening and closing torque test
Install the valve on a special device, fill the valve with nitrogen or air to the nominal working pressure from the valve inlet, close it according to Article 4.3.1, immerse it in water for 1 minute, there shall be no leakage, and then the valve can be opened smoothly according to Article 4.3.1. 5.4 Air tightness test
GB 15382--94
Install the valve on a special device and make the valve in the closed state and any open state (the air outlet should be closed when the valve is in the open state), fill nitrogen or air from the air inlet of the valve to the nominal working pressure, immerse in water, each for 30 seconds, the result should meet the requirements of Article 4.3.2. 5.5 Vibration resistance test
Install the valve on a special device and make the valve in the closed state, fill nitrogen or air from the air inlet of the valve to the nominal working pressure, then install the special device on the vibration test bench, vibrate at a frequency of 33%Hz, an amplitude of 2mm, and vibrate in any direction for 30 minutes, it should meet the requirements of Article 4.3.3.
5.6 Temperature resistance test
Install the valve on a special device, keep the valve in a closed state, fill the air inlet with nitrogen or air to the nominal working pressure, place it in a freezer, make the temperature reach -40±2℃, keep it for 2 hours (open and close for 1 hour each), and it should meet the requirements of Article 4.3.4 after the test. According to the above requirements, place the valve in a constant temperature box, make the temperature reach 60±2℃, keep it for 2 hours (open and close for 1 hour each), and the test results should meet the requirements of Article 4.3.4.
5.7 Pressure resistance test
Connect the air inlet of the valve to the pressure test pump, close the air outlet, and keep the valve in an open state. Fill the water pressure to 1.5 times the nominal working pressure for 3 minutes, and the results should meet the requirements of Article 4.3.5. 5.8 Durability test
Install the valve on a special device, seal the air outlet, keep the valve in a closed state, fill nitrogen or air from the valve inlet to the nominal working pressure, and conduct a durability test according to the requirements of Article 4.3.6. After the test, it should be retested according to the air tightness test in Article 5.4, and it should meet the requirements.
When the needle-type valve is undergoing a durability test, if leakage occurs at the pressure cap and the valve stem, it is allowed to tighten the pressure cap with the specified torque until the leakage disappears, and continue the test.
5.9 Safety device action test
When testing a valve with a fusible alloy safety device, the valve should be installed on a special device, keep the valve in a closed state, fill nitrogen or air from the valve inlet to a pressure of 0.4MPa, and place the special device in a tank filled with glycerin to gradually increase the temperature. It should meet the requirements of Article 4.3.7 a.
When testing valves with diaphragm safety devices, the valves should be connected to a hydraulic pump and filled with water to a pressure of 1.2 to 1.5 times the nominal working pressure, which should meet the requirements of Article 4.3.7b.
5.10 Vacuum test
For valves with vacuum requirements, a vacuum test should be performed. First, install the valve outlet on a three-way joint, close the valve, and start the vacuum pump. The test results should meet the requirements of Article 4.3.8. Then plug the tapered thread at the tail of the valve body with a plug cap, open the valve, and start the vacuum pump. The test results should also meet the requirements of Article 4.3.8.
6 Inspection rules
6.1 Factory inspection
6.1.1 Inspection one by onebzxz.net
a. Inlet and outlet connection thread inspection;
b. Appearance inspection;
c. Air tightness test.
6.1.2 Random inspection
In addition to the factory inspection items, the random inspection content should also include the safety device action test. 6.1.3 Random inspection method
The random inspection test pieces shall be selected from the qualified batches (5000 pieces per batch) produced recently and inspected by the factory. The number of random inspection pieces shall be one thousandth of each batch of products, but shall not be less than 3 pieces.
GB 15382-94
If one valve does not meet the requirements of a certain item of this standard during the inspection process, double the sampling. When the test pieces are re-tested, if there are still items that fail, the batch of products shall be considered as unqualified products. 6.2 Type test
6.2.1 In the following cases, the valve must be type tested. When there are major changes in design, process, materials, etc.; a.
b. When production is resumed after stopping production for more than half a year; When continuous production is completed for 1 year.
6.2.2 Sampling number and method
Type test specimens shall be sampled from the qualified batches of factory inspection. The sampling number and judgment number shall comply with the provisions of Article 6.1.3. The type test items and requirements shall be in accordance with Appendix A (Supplementary).
7 Marking, packaging, transportation and storage
7.1 Marking
The valve shall have the following markings:
Valve model;
Nominal working pressure;|| tt||Manufacturer's trademark;
Year and month of production or batch number.
7.2 Packaging
Before packaging, the water remaining in the valve should be removed, and the oxygen cylinder valve should be degreased. The valve should be kept clean during packaging, and the inlet and outlet threads should not be damaged; the packaging box should contain a product certificate and packing list. The packaging box should have the following marks:
Manufacturer's name;
Valve name and model;
Necessary operating requirements Symbol;
Quantity and gross weight;
Dimensions (length × width × height);
Year and month of production and batch number.
Production certificate shall indicate the following contents:
Valve name, model,
Nominal diameter;
Nominal working pressure;
Seal of quality department;
Inspection date.
7.2.3The packing list shall indicate the following contents:|| tt||Manufacturer name, product model,
Nominal diameter;
Nominal working pressure;
Quality department seal;
Inspection date.
7.3 Transportation
Transportation During shipment, the valve should be loaded and handled with care to prevent heavy pressure and collision. 135
The valve should be placed in a ventilated, dry and clean room. 136
GB15382---94
GB 1538294
Appendix A
Type test items and requirements
(Supplement)
This appendix applies to the type test of various types of gas cylinder valves. The test sequence, items and quantity shall be as specified in Table A1. Table A1
Test piece number
Test sequence number
Test inspection items
5.1 Appearance inspection
5.2 Connection thread inspection
5.3 Opening and closing torque test
5.4 Air tightness test
5.5 Vibration resistance test
5.6 5. Temperature resistance test
5.9 Safety device action test
5.10 Vacuum test
5.1 Appearance inspection
5.2 Connection thread inspection
5.3 Opening and closing torque test
5.4 Air tightness test
5. 6 Temperature resistance test
5.7 Pressure resistance test
5.9 Safety device action test
5.10 Vacuum test
5.1 Appearance inspection
5.2 Connection thread inspection
5.4 Air tightness test
5. 8 Durability test
Number of sampling
Additional remarks:
GB15382-94
This standard is proposed by the National Technical Committee for Standardization of Gas Cylinders. This standard is under the jurisdiction of the National Technical Committee for Standardization of Gas Cylinders Annex Branch. The main drafters of this standard are Cai Yanxin, Zhang Qianlong, Hu Jinggan, and Chen Weiming. 138
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