HG 2484-1993 Aviation Inner Tube Valve HG2484-1993 Standard Download Decompression Password: www.bzxz.net

Chemical Industry Standard of the People's Republic of China
HG2484-93
Aircraft Inner Tube Valves
Published on July 5, 1993
Ministry of Chemical Industry of the People's Republic of China
Implementation on December 1, 1994
Chemical Industry Standard of the People's Republic of China
Aircraft Inner Tube Valves
This standard adopts ISO7295-1988 "Aircraft Tire Valves - Subject Content and Scope of Application - Interchangeability Dimensions"
HG2484-93
This standard specifies the model and specification representation method, structural dimensions, technical requirements, test methods, inspection rules and general requirements for product marking, packaging and storage of aircraft inner tube valves (hereinafter referred to as valves). This standard is applicable to all types of aircraft inner tube valves. 2 Reference standards
GB2828 Batch inspection counting sampling procedure and sampling table (applicable to continuous batch inspection)GB2829 Periodic inspection counting sampling procedure and sampling table (applicable to the inspection of production process stability)GB9765 Tire valve thread
HG2485 Aircraft tire valve core
3 Model, specification representation method, structure and main dimensions3.1 Model, specification representation method
3.2 Structure and main dimensions
Numbers represent the length of the valve body
Letters represent the type (there are three types: A, B, and C) Aircraft inner tube valve code
3.2.1 Structure of HZA type valve The structure and parts names of the HZA type valve are shown in Figure 1. Figure 1 HZA type valve nozzle
1-valve body; 2-round gasket: 3-hexagonal nut; 4-round gasket; 5-rim nut: 6-protective cap Approved by the Ministry of Chemical Industry of the People's Republic of China on July 5, 1993 1
Implementation on December 1, 1994
HG2484-93
3.2.2 The structure and parts names of the HZB type valve nozzle are shown in Figure 2. Figure 2 HZB type valve nozzle
1-valve body; 2-round gasket: 3-hexagonal nut; 4-round gasket 5-rim nut; 6-protective cap 3.2.3 The structure and parts names of the HZC type valve nozzle are shown in Figure 3. Figure 3 HZC type valve
1-valve body; 2-gasket; 3-hexagonal nut; 4-wheel nut; 5-protection width 3.2.4 The core cavity structure and main dimensions of the valve are shown in Figure 4. 0
HG2484-93
Figure 4 Valve core cavity
Note: The mouth end @5.4×2.5 hole can be omitted, and the 5V1 thread can be directly machined to the mouth end. 3.2.5 Structure and main dimensions of valve parts 3.2.5.1 Structure and main dimensions of valve body 3.2.5.1.1 Structure and main dimensions of HZA type valve body The main dimensions are shown in Figure 5. Swing
5.5±0.15
Valve specifications
HZA-62
HZA-65
HZA-70
HZA-75
HZA-80
HZA-90
HZA-—98
HZA—105
HG2484—93
10.7-0.36
Figure 5 HZA type valve body
Figure 5 Table
12 V1 thread
Valve specifications
HZA-110
HZA—113
HZA-118
HZA—123
HZA-135
HZA—142
HZA-164
HG248493
Continued Figure 5 Table
The structure and main dimensions of the HZB type valve body are as follows As shown in Figure 6, 3.2.5.1.2
4.7±0.15
8V1 thread
Figure 6 HZB type valve body
Valve specifications
HZB-65
HZB-70
HG2484—93
“Figure 6 Table
3.2.5.1.3 The structure and main dimensions of the HZC type valve body are shown in Figure 7, 1 0+6
4.7±0.15
8V1 thread
Figure HZC valve body
3.2.5.2 Structure and main dimensions of valve protective capH
3.2.5.2.1 Valve protective caps are of three types: 1, 2 and 3. Their structures and main dimensions are shown in Figures 8, 9 and 10 respectively.
HG2484-—93
Figure 81 protective cap
1—cap body; 2—rubber pad
Figure 92 protective cap| |tt||1 Cap body; 2—Metal pad; 3—Rubber pad
HG2484—93
Figure 103 type protective cap
1—Cap body; 2—Metal pad: 3—Rubber pad
3.2.5.2.2 The metal pad and rubber pad are used in conjunction with the protective cap. Their structures and main dimensions are shown in Figures 11 and 12, respectively. 45
Figure 11 Metal pad
3.2.5.3 Structure and main dimensions of hexagonal nuts The structure and main dimensions of the hexagonal nut are shown in Figure 13, Figure 12 Rubber padwwW.bzxz.Net
3 .2.5.4 Structure and main dimensions of round washers HG2484-93
Figure 13 Hexagonal nut
Figure 13 Table
The structures and main dimensions of the two round washers are shown in Figures 14 and 15. 3
Figure 14 Table
Valve types
HZB, HZC
3.2.5.5 Structure and main dimensions of rim nuts HG2484
The structure and main dimensions of the rim nuts of HZA and HZB valves shall comply with 3.2.5.3 According to the provisions, the structure and main dimensions of the rim nut of the HZC type valve nozzle shall be as shown in Figure 16. 14±0.2
Figure 16HZC type valve nozzle rim nut
3.3 Valve nozzle thread dimensions and tolerances
5V1, 8V1, 12V1 The limit dimensions and tolerances of the threads shall conform to the provisions of GB9765. 4 Technical requirements
4.1 Basic requirements
Products shall conform to the requirements of this standard and shall be manufactured in accordance with the drawings and documents approved in the prescribed procedures. Products that meet the requirements of this standard are first-class products. 4.2 Materials
The materials of valve parts shall comply with the requirements of Table 1. Name
Hexagonal nut, rim nut
Protective cap, metal washer
Round washer
4.3 Surface of nozzle body
HG248493
Brass HPb63-0.1
Brass HPb59-1
Steel plate A,
4.3.1 The nozzle bodies of valves supplied by the supplier in accordance with this standard are all straight. If the user requires a bending angle, the bend is not allowed to have a depression greater than 0.2mm in depth.
4.3.2 The surface of the nozzle body should be smooth, No burrs, cracks, oil stains, rust and other defects. 4.3.3 The nozzle base is not allowed to have unprocessed surfaces. 4.3.4 The inside and outside of the nozzle base are allowed to have a difference of 0.15mm. 4.3.5 The outside of the nozzle base should be machined into fine spiral grooves with a groove depth of 0.1~0.5mm. 4.4 Surfaces of other parts
4.4.1 The surface of the protective cap and the metal gasket for the protective cap, hexagonal nut, and rim nut should be smooth and free of burrs, cracks, oil stains, rust and other defects.
4.4.2 The surface of the round gasket should be free of burrs and should have a protective coating. 4.4.3 The surface of the sealing rubber gasket for the protective cap should be smooth and free of defects such as lack of glue. 4.5 Performance
4.5.1 After screwing the qualified aviation tire valve core into the valve mouth of various specifications according to the torque specified in HG2485, it should be able to seal 3.80MPa of air pressure.
4.5.2 The protective cap at the end of the valve stem should be able to seal. Under an air pressure of 1.57MPa, no visible air leakage should be found within 30s.
4.5.3 When the nozzle body is bent according to the use requirements, it shall not be cracked. 5 Test method
5.1 Appearance inspection
Use visual inspection and conventional testing methods to check whether the valve nozzle meets the requirements of 4.3 to 4.4. 5.2 Air tightness test
5.2.1 Air tightness test of valve nozzle and valve core After the valve nozzle is installed with a qualified aircraft tire valve core according to the torque specified in 4.5.1, it is placed in water with the nozzle facing up and the nozzle 2cm away from the water surface. Then, the air pressure specified in 4.5.1 of this standard is passed and maintained for 120s to observe whether there is any leakage. 5.2.2 Protective cap sealing test
The valve body is not equipped with a valve core. Tighten the protective cap by hand and put it into water with the mouth facing downward and 2 cm above the water surface. Then pass the air pressure specified in 4.5.2 of this standard and keep it for 30 seconds to observe whether there is any leakage. 5.3 Bending test
Use a valve bending tool with a bending radius of 3.5 mm to bend the valve base and the allowed length into 90°, and then perform 1
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