JB/T 9081-1999 Technical requirements for cryogenic stop valves and throttle valves for air separation equipment
Some standard content:
ICS 23. 060. 09
Machinery Industry Standard of the People's Republic of China
JB/T9081-1999
Specifications for cryogenic shutoff valves and throttlevalves used for air Beparation plants1999-07-12issued
State Bureau of Machinery Industry
200心-01-心1实
JBT9081-[999
This standard is a revision of 2BJ76030-90 Specifications for cryogenic shutoff valves and throttlevalves used for air separation equipment. The main technical changes are as follows:
In the scope, the nominal diameter is added;
In the referenced standards, the reference standard and GBT12220 are added. GR118.1, GR1184, GR106, GR146 ZBJ76029:
- In 3.3 manufacturing, some provisions on the shape and position tolerances and surface roughness requirements of the main parts are cancelled. This standard replaces ZBJ7G030-90 from the date of implementation. This standard is proposed and managed by the Technical Committee for Standardization of Gas Separation and Liquefaction Equipment. The drafting unit of this standard: Hangzhou Oxygen Generator Co., Ltd. The main drafters of the standard: Li Anan, Yu Ping This standard was first issued in March 1981.
1 Scope
Machinery Industry Standard of the People's Republic of China
Technical Conditions for Cryogenic Shutoff Valve and Throttle Valves Used for Air Separation Equipment
Specifieations tor eryugenic shutoff valve and throttle valves used for alrBeparatlon plantsJE/T 9081—1999
代营7门6030—90
This standard specifies the technical requirements, test methods, inspection rules and marking, packaging, transportation and treatment of cryogenic shutoff valves and throttle valves used for air separation equipment.
This standard is applicable to low-temperature stop and regulating throttle valves for air separation equipment with nominal pressure PN 25MPa, nominal diameter DN350mm, temperature 196-80C, medium air, oxygen, nitrogen, hydrogen and liquid air, liquid oxygen, liquid nitrogen, oxygen, 2 Reference standards
The provisions contained in the following standards constitute the provisions of this standard through reference in this standard. When the version is not released, the version shown is valid. All standards are publicly revised, and all parties using this standard should explore the possibility of using the latest version of the following standards. QB.T t971981
OB/T 699—[988
GR/T 700—1988
GB/T I174 -. 1992
GB/T 1176 --1987
GD/T [220—1992
GB/T 2100—19 80
GB/T 3190—1996wwW.bzxz.Net
GB/5232—1985
GB/5796.4—1986
GB/ 12220—1989
JB/1580-1975
3 Technical requirements
Tolerance and fit of thread (diameter 1-355m) Technical conditions for high-quality carbon fiber structure
Carbon fiber structure
Bearing alloy
Technical conditions for cast copper alloy
Stainless steel rod
Technical conditions for stainless acid-resistant parts
Chemical composition of deformed aluminum and aluminum alloy
Chemical composition of processed aluminum Product shape and shape Trapezoidal thread tolerance
General valve mark
Lead welding container Technical conditions
3.1 Low temperature stop valves and throttle valves for air separation equipment shall comply with the provisions of technical standards and be manufactured according to detailed technical documents approved by the specified environment.
3.2 Materials of main parts
The materials used for parts must have material certificates that meet the requirements of chemical composition and mechanical properties. For materials without material certificates, chemical analysis and mechanical properties tests must be carried out. Approved by the State Machinery Industry Bureau on July 12, 1999, January 1, 2000 Implementation
JB/T9081-1999
The chemical composition and mechanical properties of the materials shall conform to the following standards: GB/T699.GB.T700.GB/T1176.GB/T1220, GB/T5232.0B/T2100.GB.T3190.GB/T1174, 3.3 Manufacturing
3.3.1 The casting surface (especially the inner cavity) shall be cleaned of the molding sand, oxide scale and filter mesh. 3.3.2 Casting There shall be no defects such as pores, shrinkage cavities, cracks, sand holes, non-metallic impurities and looseness that affect the strength and tightness. Repair welding is allowed under the condition that the company obtains the consent of the design department and guarantees that it will not affect the casting strength and tightness. Repair welding is carried out during heat treatment: 3.3.3 Before forging, the surface defects of the raw materials for forging shall be completely removed. Materials with defects shall not be subjected to forging. 3.3.4 There shall be no defects such as cracks, folding, late scratches, spots, slag inclusions, etc. on the surface of forgings. If there are the above defects, they can be completely removed after processing and are allowed to be used.
3.3.5 When forging with forging bad materials, it is calculated according to the main body cross-sectional area. Its forging ratio is not less than 3.3.3.6 If there is a lack of penetration defect in aluminum welded parts, it is allowed to re-weld once: 3.3. Heat treatment of necessary parts
3.3.7.1 The steel alloy castings of the valve body, valve seat and valve body must be aged. 3.3.7.2 The forgings or welded parts of molybdenum alloys must be annealed. 3.3.7.3 The valve body, valve seat, seat and lining of chromium alloy must be annealed and aged. 3.3.7.4 The valve cover, valve cover and other parts of austenitic stainless steel must not be cured. 3.3.7.5 The low alloy frame must be normalized and tempered. 3.3.8 Nondestructive testing of aluminum alloy valve body forgings and welded fittings 3.3.8.1 100% of the longitudinal welds of the joints shall be inspected by X-ray according to the grade requirements specified in JB/T1580. 3.3.B, Z The circumferential welds of the body and the pipe (or flange) shall be inspected according to the grade requirements of JB/T1580 for those that can be inspected by X-ray.
3.3.8.3 The circumferential welds of the body and the pipe (or flange) that cannot be inspected by X-ray due to their position shall be inspected by 1HU% for the bottom and surface double-layer color inspection, and the quality of the weld shall be guaranteed by process measures. 3.3.4 Nondestructive testing of the joint body shall be carried out after heat treatment. 3.3.9 The sealing surface shall be flat and smooth, without any scratches, pores, cracks and other defects. The surface roughness R value shall be as specified in the table: Table
Sealing surface
Flat hard sealing surface
Ketone sealing surface, ancient flow surface
3.3.10 Each surface of the chrome alloy embedded valve seat shall be hard anodized, with an oxide layer thickness of 0.6-0.80mm and HV 35. The hardness difference between the sealing surface and the sealing surface shall not be less than 50HV. 3.3.1 Components: The thread of valve stem, valve cover, valve frame, stem nut and two nuts shall be processed to be smooth and free of thorns, marks and cracks. [1. The tolerance grade of the thread is 6 in accordance with GB/T197, with a surface roughness of R.6.3; the tolerance grade of the trapezoidal thread is 9 in accordance with GB/T5796.4, with a surface roughness of R.3.2. 2
JB/9081-1999
3.3.12 The stem made of 2C13 or 3Cr13 shall be tempered to 28~32HRC. The stem made of 1Cr18N19Ti shall be melt-treated. The matching parts of the stem, packing, female cover (or shaft) and valve body shall be hard chrome plated, with a hard chrome plated layer thickness of 0.02~0.04mm. The inspection hole of the packing is not allowed to be filled.
3.3.13 The welded composite piece of austenitic chromium-nickel stainless steel valve cover must be heat treated to eliminate the welding stress. 3,3.14 The inlet and outlet flanges of the flange connection should be equipped with aluminum tube butt joint loose steel flanges, lead shoulder rings, and the tight fittings of the flange should be made of sintered chromium-nickel stainless steel. 3.3.15 The surface roughness of the inner gland, disc and valve cover of the valve connected to oxygen should be 3.3.16 The inner surface of the parts should be cleared of burrs, cleaned with a white, fine, T-shaped paper, and free of oil marks; the assembly pressure should not be re-contaminated. 3,3.17 Use the valve with a core-shaped gasket as the main body. When assembling the core-shaped gasket, carefully check whether there are scratches, deformations and other defects on the surface. Clean the surface of the core-shaped gasket and the matching parts. 3.3.18 Requirements for the installation and adjustment of materials
3.3.18.1: When using square and single-ring asbestos packing, the single ring should be cut into 30-45 incisions, and the assembly leaves should be cut into [20 cross-sections and opened, and should be gradually compressed.
3.3.18.2 The height and tightness of the packing after entering the stuffing box should ensure that the seal is not blocked and does not hinder the movement of the valve. There should be a certain adjustment plate. When using the surface to change the material, it should not be pressed too tight to avoid the elasticity of the particles. 3.3.18.3 The valve is inspected and the packing should be loose: in a state of unloading. 3.3.19 The valve should be closed when the hand-operated needle is turned back. 3.3.20 After assembly, the valve should be self-closing and flexible, and there should be no jamming. 3.3.21 When the medium is gas, oxygen or high load (oxygen content is greater than or equal to 30%), the valve should have an oil-free mark. 3.3.22 The product should ensure continuous operation for 1 year. 4 Test method
4.1 Water pressure strength test
1.1. The valve body, valve cover and its composite parts should be tested with 15 times the nominal pressure. 4.1.2 During the water pressure test, the pressure should be increased by the specified value, and stopped for 3 minutes. There is no visible leakage. If there is any doubt during the test, the test time must be extended by one time.
4.1.3 All valves, valves, valve covers, etc. that have been repaired should be re-tested. 1.1.4 After the test, the water in the valve body cavity should be eliminated immediately. The surface should be treated with anti-frequency treatment. 4.2 Normal source gas test
4.2.1 The test medium is warm, oil-free, dry air or nitrogen. 4.2.2 The stop valve and throttle valve should be tested at nominal pressure. During the test, the valve is opened and kept for 1m. No leakage is seen at the connection of the stuffing box.
4.2. The gas injection test of the seal of the valve body with industrial seal is carried out at nominal pressure. The test must be carried out completely. The control cover is lowered and kept for 1L. No leakage is seen at the end of the steel rod of the stuffing box. 4.2.4 The shut-off valve shall be tested for air tightness. The test medium flows in the direction of the medium used. The valve cover is allowed to be oiled. The valve is closed and opened three times each. The valve stays for 1 minute in the closed state. The leakage is checked at the outlet of the valve body: 1
4.2.4.1 The stop valve of copper alloy body is tested at nominal pressure. No leakage is visible within the specified duration. 4.2.4.2 The stop valve of aluminum alloy body is tested at 0.6MPa pressure. Within the specified duration, when DN is greater than 80mm, the leakage shall not exceed 30×DNmms: when DN is 3i00mm, the leakage shall be determined by the user and the manufacturer: It is appropriate to test with the maximum working pressure according to the user's requirements, and the leakage shall be determined by the user and the manufacturer. 4.2.5 The shut-off valve is generally not subject to the sealing test. However, the sealing test can be carried out according to the user's requirements. 4.26 When the stop valve is tested for air tightness, one person should be required to turn the hand wheel to close it with his/her own strength. No other levers are allowed. When the wheel diameter is greater than or equal to 20mm, only one person is allowed to operate. 4.2. The valve should be kept clean, dry and oil-free during the air tightness test. 4.3 The type test of the stop valve is carried out at low temperature. During the test, the valve body and lever (excluding the sleeve) of the stop valve are soaked in liquid at normal pressure and cooled thoroughly. After being taken out, the reverse test is carried out according to the method specified in 4.2.4. 5 Inspection rules
5.1 Product delivery inspection shall be in accordance with the provisions of 4.1.4.2. Type inspection shall be in accordance with the provisions of 4.1, 4.2, 4.1. 5.2 All products that have been qualified shall be accompanied by product certificates. 5.3 The user shall inspect the delivered products according to this standard, and the inspection content shall be specified in the ordering agreement. 6.1 The marking of the product shall comply with the provisions of GB 12220. 6.2 The valve body (except for those with coating) shall be sealed. 6.3 The valve body should be closed during packaging, storage and transportation. The packaging should be sensitive to the damage of the product during normal storage and transportation. The inlet and outlet of the valve should be sealed and sealed with plastic packaging. The stuffing and O-ring in the spare parts box should be marked with the parts label. The effective storage period is 1 year. 6.4 Product packaging: Product certificate. Product packing list and product instruction manual. If the product is packed in the same box, a product instruction manual will be provided.
6.4.1 Product certificate
) Manufacturer name and date of manufacture:
) Product name, model and specification (including the distance between the center load of the inner door outlet and the flange connected to the sleeve, i.e. length) Nominal normal force, nominal diameter, manufacturing method, applicable temperature: d>Factory number
) Stamped with the official seal of the manufacturer's inspection department and the inspector's seal and inspection date. 6.4.2 Product Packing List
a) Manufacturer's name:
b) Product name, number and specification:
c) Spare parts;
d) Quantity, net weight and gross weight of each box of products;
a) The manufacturer's responsible packaging department's signature and the box inspector's seal and the inspection date; 6.4.3 Product Instructions
a) Manufacturer's name:
b) Purpose and important specifications:
JR/T9081-1099
b) Function and structure description (the structural diagram should indicate the overall dimensions and connection dimensions;
c) Main parts and materials;
e) Maintenance, maintenance, installation and use precautions;
d) Possible faults and elimination methods. 6.5 The finished products should be stored in a dry room, and no storage or storage is allowed. The products should be stored in a pile of grass.3 The closed-type test of the valve is carried out at low temperature. During the test, the valve body and the stem (excluding the sleeve) are immersed in the liquid at normal pressure and cooled thoroughly. After being taken out, they are tested in reverse according to the method specified in 4.2.4. 5 Inspection rules
5.1 The product delivery inspection shall be in accordance with the provisions of 4.1.4.2. The type inspection shall be in accordance with the provisions of 4.1, 4.2, 4.1. 5.2 All products that have been qualified shall be accompanied by a product certificate. 5.3 The user shall inspect the delivered products according to this standard, and the inspection contents shall be specified in the order agreement. 6 Marking, packaging, transportation and storage
6.1 The marking of the product shall comply with the provisions of GB 12220. 6.2 The surface of the large-scale valve (except for those with coating) shall be cleaned with a ball. 6.3 During packaging, storage and transportation, the valve should be closed. The packaging should be sensitive to the damage of the product during normal storage and transportation. The inlet and outlet of the valve should be sealed and sealed with plastic packaging. The stuffing and O-ring seals in the spare parts box should be marked with the parts label. The effective storage period is 1 year.
6.4 Product packaging: Product certificate. Product packing list and product instructions. If the product is packed in the same type, a product instruction manual is provided.
6.4.1 Product certificate
) Manufacturer name and date of manufacture:
) Product name, model and specification (including the distance between the center of the valve outlet and the flange connected to the flange, i.e. the length of the flange)) Nominal normal force, nominal diameter, manufacturing method, applicable temperature: d> Factory number
) Stamped with the official seal of the manufacturer's inspection department and the inspector's seal and inspection date. 6.4.2 Product Packing List
a) Manufacturer's name:
b) Product name, number and specification:
c) Spare parts;
d) Quantity, net weight and gross weight of each box of products;
a) The manufacturer's responsible packaging department's signature and the box inspector's seal and the inspection date; 6.4.3 Product Instructions
a) Manufacturer's name:
b) Purpose and important specifications:
JR/T9081-1099
b) Function and structure description (the structural diagram should indicate the overall dimensions and connection dimensions;
c) Main parts and materials;
e) Maintenance, maintenance, installation and use precautions;
d) Possible faults and elimination methods. 6.5 The finished products should be stored in a dry room, and no storage or storage is allowed. The products should be stored in a pile of grass.3 The closed-type test of the valve is carried out at low temperature. During the test, the valve body and the stem (excluding the sleeve) are immersed in the liquid at normal pressure and cooled thoroughly. After being taken out, they are tested in reverse according to the method specified in 4.2.4. 5 Inspection rules
5.1 The product delivery inspection shall be in accordance with the provisions of 4.1.4.2. The type inspection shall be in accordance with the provisions of 4.1, 4.2, 4.1. 5.2 All products that have been qualified shall be accompanied by a product certificate. 5.3 The user shall inspect the delivered products according to this standard, and the inspection contents shall be specified in the order agreement. 6 Marking, packaging, transportation and storage
6.1 The marking of the product shall comply with the provisions of GB 12220. 6.2 The surface of the large-scale valve (except for those with coating) shall be cleaned. 6.3 During packaging, storage and transportation, the valve should be closed. The packaging should be sensitive to the risk of damage during normal storage and transportation. The inlet and outlet of the valve should be sealed and sealed with plastic packaging. The stuffing and O-ring seals in the spare parts box should be labeled with the parts label. The effective storage period is 1 year.
6.4 Product packaging: Product certificate. Product packing list and product instructions. If the product is packed in the same package, a separate product instruction manual will be provided.
6.4.1 Product certificate
) Manufacturer name and date of manufacture:
) Product name, model and specification (including the distance between the center of the valve outlet and the flange connected to the flange, i.e. the length of the flange)) Nominal normal force, nominal diameter, manufacturing method, applicable temperature: d>Factory number
) Stamped with the official seal of the manufacturer's inspection department and the inspector's seal and the inspection date. 6.4.2 Product Packing List
a) Manufacturer's name:
b) Product name, number and specification:
c) Spare parts;
d) Quantity, net weight and gross weight of each box of products;
a) The manufacturer's responsible packaging department's signature and the box inspector's seal and the inspection date; 6.4.3 Product Instructions
a) Manufacturer's name:
b) Purpose and important specifications:
JR/T9081-1099
b) Function and structure description (the structural diagram should indicate the overall dimensions and connection dimensions;
c) Main parts and materials;
e) Maintenance, maintenance, installation and use precautions;
d) Possible faults and elimination methods. 6.5 The finished products should be stored in a dry room, and no storage or storage is allowed. The products should be stored in a pile of grass.
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.