Some standard content:
National Standard of the People's Republic of China
Technical Conditions for Flared Type Pipe Fittings
Specification for ared type pipe fittingsUDC 621.643.4
: 889. 64
GB5668-85
This standard applies to various flared type pipe fittings and their assembly parts specified in GB5625~5652-85. These pipe fittings are suitable for the general use requirements of hydraulic and pneumatic systems in industrial equipment and commercial products. 1 Dimension Marking
1.1 Various pipe fittings and their assemblies use the outer diameter of the pipe used as the main parameter for marking. The marking method is specified in the relevant standards of GB 5625~5652-85.
2 Technical Requirements
2.1 Materials
2.1.1 The materials used to manufacture pipe fittings should meet the actual pressure range and the requirements of the medium transported in the pipeline system. 2.1.2 When using carbon steel materials, it is recommended to select according to Table 1. Part Name
Joint body, nut hollow bolt
Sealing gasket
Pin nut seat
Tensile strength UN/mm
(kgf/mm2)2
372 (38)
314 (32)
510 (52)
Recommended brand
Standard number
GB699—65
GB 699--65
GB 699—65
2.1.3 In addition to the materials recommended in Table 1, the production can select other carbon steel materials according to the process requirements, but the tensile strength 0 shall not be lower than that specified in Table 1.
2.1.4 If the user needs to use stainless steel, copper alloy, aluminum alloy and other materials, he can negotiate with the manufacturer. 2.2 Structure and size
2.2.1 The structure and size of the flared pipe joint and its combined parts shall comply with GB5625~5652-85. The provisions of the corresponding standards. The pipe flaring type size and allowable use pressure are recommended to adopt the provisions of Appendix A (reference part), and the structure size of the ○-type sealing ring oil port is recommended to adopt the provisions of Appendix B (reference part).
2.2.2 When the table size is used and the performance of the pipe joint is not affected, the outer structure of the pipe joint can be determined by the manufacturer. However, the sharp change of the cross section in the joint body should be avoided. 2.2.3 Fluid channel
2.2.3.1 When the fluid channel is processed from the two ends of the joint body, the coaxiality tolerance of the drilling axis at both ends of the channel is $0.38mm, and it should be able to pass the inspection steel ball 0.5mm smaller than the minimum channel diameter. Issued by the National Bureau of Standards on November 25, 1985
Implemented on September 1, 1986
GB5653-B5
2.2:3.2 The cross-sectional area of the intersection of the fluid channels of the special-shaped pipe joint body shall not be less than the cross-sectional area of the smaller fluid channel. 2.2.4 Wall thickness, unless otherwise agreed by the supply and demand parties, the wall thickness of any point on the joint body and its combined parts shall not be less than the minimum wall thickness determined by the inner diameter, outer diameter dimensions and tolerances specified in the corresponding standards. 2.2.5 Dimensional tolerances and shape tolerances
2.2.5.1 The dimensional tolerances and shape and position tolerances listed in the table are the final dimensions and tolerances after heat treatment and surface treatment. 2.2.5.2 The drilling dimension tolerances of the fluid channel shall be as specified in Table 2. Table 2
Drilling size range
6 ~ 10
>10 ~18
>18 ~ 30
>30~50
+ 0:33
2.2.5.3 The verticality tolerance of the bearing surface (sealing surface and end face of the locking nut) of the end pipe joint body to the axis of the thread d is 0.1mm.
2.2.5.4 The circular runout tolerance of the cone surface on the joint body to the axis of the connecting thread d is 0.2mm. 2.2.5.5 The coaxiality tolerance of the inner cone surface axis of the B-type pipe joint nut, A-type and B-type hollow bolt to the axis of the connecting thread d is 0.2mm
2.2.5.6 The coaxiality tolerance of the inner cone surface axis on the pipe sleeve to the axis of the Dz hole is 0.2mm. 2.2.5.7 The limit deviation of the 90° angle between the fluid channel axis of the special-shaped pipe joint body with pipe outer diameter D of 4~10mm and D of 12~34mm is ±2.5\ and ±1.5° respectively. 2.2.5.8 The chamfer of the hexagonal end face of the part is about 30°, and the chamfer diameter dw~0.95S (see Figure 1). Figure
GB5653-B5
2.2.5.9 The minimum diagonal width (e) of the hexagon on the joint body and its combined parts shall not be less than 1.092 times the nominal width across flats, and the single-side width shall not be less than 0.43 times the nominal diagonal width. 2.2.5.10 The limit deviation of the large-angle width across flats (S) on machined parts shall comply with the provisions of Table 3. Table 3
Note: For parts made of hexagonal bars, the limit deviation of the hexagonal width across flats (S) shall comply with the provisions of the raw material standards. 2.2.5.11
2.2.5.12
1 Determined by the process.
The limit deviation of the width across flats (S) of castings and die forgings shall comply with the provisions of Table 4. Table 4
The dimensions of the casting and die forging platforms on the special-shaped joint body shall comply with the provisions of Figure 2 and Table 5. The values of R1 and R2 in Figure 2 are determined by the manufacturing process. Figure 2
GB5653-85
2.2.5.13 Provisions for unmarked dimensional tolerances and form and position tolerances of machined parts of parts 2.2.5.13.1 The limit deviation of unmarked tolerance dimensions shall be in accordance with the provisions of GB1804-79 "Tolerances and fits, limit deviations of unmarked tolerance dimensions", the hole is H14, the shaft is hju, and the length is Js15 or js15. 2.2.5.13.2 Unmarked shape and position tolerances shall be in accordance with the D-level provisions of GB1184-80 "Provisions for shape and position tolerances" 2.2.5.14 When using cutting technology, all unspecified external circles, internal hole chamfers and chamfers shall be in accordance with the provisions of JB5-59 "Chamfer and chamfer radius of parts". Die forging and casting fillets are determined by the manufacturing process. 2. Thread
2.8.1 The basic dimensions of common threads shall comply with the provisions of GB196-81 "Common Thread Basic Dimensions (Diameter 1~600mm)". The tolerances and fits shall comply with the provisions of GB197-81 "Common Thread Tolerances and Fits (Diameter 1~355mm)". The fit of internal and external threads is 6H/6g. The basic dimensions and tolerances of metric taper threads shall comply with the provisions of GB1415-78 "Metric Taper Threads". Other threads may be used by negotiation between the supplier and the buyer.
GB 5653--85
2.3.2 The threads may be processed by cutting or rolling, and the thread finish, shoulder distance, undercut groove and internal and external chamfer dimensions shall comply with the provisions of GB3-79 "Thread Finish, Shoulder Distance, Undercut Groove, Chamfer". 2.4 Surface roughness
2.4.1 The surface roughness of the side of the external thread is, and the surface roughness of the side of the internal thread is. 2.4.2 The other surface roughness of the parts shall comply with the relevant product standards. 2.5 Surface treatment
2.5.1 Carbon steel pipe joints and their joint parts shall be subjected to surface oxidation treatment. The manufacturer may also carry out other surface treatments according to the user's requirements. It is recommended to use galvanizing treatment, followed by acid salt or phosphate (oil immersion) treatment. If necessary, a salt spray test can be carried out.
2.5.2 When other materials are used, the surface treatment method and test method shall be negotiated by the manufacturer and the user. 2.B Surface quality
2.6.1 All the working surfaces of the joint body and its parts shall not have burrs, and the threads shall not have broken buckles and pressure injuries. Unless there is a requirement for surface treatment, all sealing surfaces shall be smooth. All non-forged surfaces such as forging surfaces, rough surfaces of raw materials, etc. should not have any defects that affect the performance, such as cracks, burrs, pores, sand holes, oxide scale shedding and loose tissue. 3 Product marking
3.1 Pipe fittings and their combined parts specified in GB5625~5652-85 should be marked in accordance with the following provisions. 3.1.1 Specifications (D), materials and manufacturer's trademarks or logos should be marked on the pipe fitting body in sequence, separated by ",".
3.1.2 Carbon steel materials should be marked with material grades, and stainless steel, copper alloys and aluminum alloys should be marked with letters S, C, and A respectively. 3.1.3 The marking position of the product should not affect the performance and surface protection layer of the parts, and its handwriting or symbols should be clear. 3.1.4 The size and process of the product marking shall be determined by the manufacturer. Acceptance inspection of automobile products
4.1 Basic rules
4.1.1 The supplier has the right to use any inspection procedures and equipment to control quality during the production process (including finished product warehouse acceptance inspection), but must ensure that the quality of the finished pipe joints meets the requirements of the relevant standards. 1.2 If the purchaser deems it necessary or economically reasonable, the product submitted for acceptance may be exempted from inspection based on the supplier's quality, reputation and the quality assurance of previously delivered products. The purchaser may also conduct acceptance inspection based on the sampling plan determined by the purchaser. Such inspection shall not increase the risk of rejection of the supplier, that is, it shall not reduce the AQL value or the probability of acceptance. 4.1.3 This standard adopts piece-rate sampling plan for inspection, that is, when a product has several unqualified dimensions and appearance, it shall also be counted as a piece. 4.1.4 Each batch of sampled products shall be made of the same batch of materials and consist of the same variety, type and specification. 4.2 Inspection Items
4.2.1 Appearance Inspection Items
Appearance inspection items include surface treatment, surface quality and marking, etc., and its requirements shall be in accordance with the provisions of 2.5.1, 2.6.1, 3.1.1, 3.1.2, 3.1.3, etc.
4.2.2 Main dimensional inspection items 1
4.2.2.1 The dimensional tolerance, geometric tolerance and thread dimension tolerance specified in the product standard are the main dimensional inspection items 11, and their requirements shall comply with the provisions of the corresponding standards.
4.2.3 Tensile strength inspection of the joint body: The tensile strength of the joint body is guaranteed by the raw materials, and generally no inspection is carried out. When the supply and demand parties agree to carry out this inspection, the test method shall be negotiated by both parties, but the tensile strength of the joint body shall not be less than 4 times the actual working pressure. 4.3 Acceptance inspection procedure
4.3.1 Acceptance inspection procedure for non-destructive inspection items GB 5658—85
4.1.1 Non-destructive inspection items include product appearance inspection and main dimensional inspection items. 4.3.1.2 Inspection items and acceptable quality level (AQL) shall comply with the provisions of 4.2.1 and Table 6. 4.3.1.3 Select the appropriate ratio (LQ0/AQL) 4..1.3.1 The purchaser shall determine the ratio according to the use requirements of the pipe joint. For those with higher use requirements, a smaller ratio may be selected. 4.3.1.3.2 The purchaser may also determine the ratio according to the product quality submitted by the supplier. For suppliers with poor quality or unknown supply quality, a smaller ratio may be selected.
4.3.1.3.8 A smaller ratio requires a larger sample and higher inspection costs. A larger ratio can reduce the sample and inspection costs.
4.$.1.4 According to the qualified quality level (AQL) specified in Table 6 and the selected ratio (LQ10/AQL), the sampling plan is found from Table 7, that is, the sample size (n) and the qualified judgment number (Ac). When there is a dispute between the supply and demand parties, a sampling plan with a supplier risk of no more than 5% should be selected.
4.3.1.5 Randomly select samples from the inspection batch and inspect them item by item. If the number of unqualified products is equal to or less than the qualified judgment number (Ac), the product batch can be accepted, otherwise the product batch shall be rejected. 4.3.1.6 If the supplier has a dispute over the product batch rejected by the purchaser, re-sampling shall be carried out for arbitration inspection according to the sampling plan specified in Article 4.3.1.4.
Table 6 Inspection items and qualified quality levels
Tensile strength inspection
Main dimension inspection
Appearance inspection
Determination number
Table 7 Sampling plan
Qualified quality half (AQL)
Qualified quality rate (AQL)
(LQ/AQL)
Producer risk
Note: ①All data in Table 6 and Table 7 are extracted from GB2828-81 "Sampling table for batch inspection by counting sampling procedure", but the relationship between batch size and sample size specified in Table 2 of GB2828-811 is not applicable to Table 7. For stand-alone batch inspection, the sampling plan is determined by AQL and LQ1L/AQL. ②The plan with a qualified determination number of 0 is only applicable to tensile strength inspection. ③If the batch is equal to or less than the required sample size, 100% inspection shall be implemented. ④ Producer risk refers to the probability that the actual quality level of the product batch submitted for acceptance reaches the specified AQL value, but is still rejected by the sampling plan.
@ For the terminology of sampling inspection, please refer to GB2828-1. GB 5653-85
4..2 Acceptance inspection procedures for destructive inspection items 4.3.2.1 Destructive inspection items refer to the tensile strength inspection of the joint body. 4.3.2.2 Inspection requirements and qualified quality level (AQL) shall be in accordance with the provisions of Article 4.2.3 and Table 6. 4.3.2.3 According to the qualified quality level (AQL) specified in Table 6, the sampling plan is found from Table 7. That is, the sample size (n) and the qualified judgment number (A.) are found. Due to the high cost of tensile strength inspection, in order to reduce the inspection work, the standard stipulates that the acceptance inspection and the cutting inspection shall adopt the sampling plan with a producer risk of 11.83% (qualified judgment number is 0). 4.3.2.4 Randomly select samples from the inspection batch for inspection. If all samples are qualified, the batch of products will be accepted, otherwise they will be rejected. 5 Packaging
5.1 Before packaging the finished product, dirt and metal chips should be removed. The surface of parts without anti-corrosion coating should be coated with rust inhibitor to prevent corrosion during transportation and storage. Under normal transportation and storage conditions, it should be guaranteed not to rust within one year from the date of leaving the factory. 5.2 Components or parts should be packaged inside and outside when leaving the factory. The packaging method and container materials shall be determined by the manufacturer according to the environment during transportation, transportation equipment and other conditions.
5. The outer skin of the packaging shall be stamped with the following contents:
Manufacturer name,
Component or part name;
Specified mark of component or part;
Component or part quantity!
Manufacturing date and production batch number.
The packaging should avoid the following defects:
The contents specified in Article 5.3 are missing, incorrect, unclear, etc.: Omission, deformation, damage, etc. of the packaged parts: Incorrect placement of the packaged components.
The content of the product certificate is,
Manufacturer name +
Component or part name,
Manufacturing date and production batch number:
Technical inspection department signature.
The use, assembly and expansion type and size of the pipe fittings used with them 6
The assembly method of the expansion type adjustable pipe fittings and the expansion type combined pipe fittings is shown in Appendix C (reference). 6.2 The expansion type and size of the pipes used with the expansion type pipe fittings are shown in Appendix A (reference). 68±1\74±
Flare support surface
GB 5653—85
Appendix A
Pipe flare type dimensions and allowable operating pressure (reference)
“Inner wall of the mouth should be closely attached to the full length before
Figure A174° Single layer and folded layer flare dimensions interval scene actual thickness±0,12m
Flare inner wall should be closely attached to the full length of the support surface before
Figure A290° Single layer and folded layer flare dimensions5±0.5
74 ±1
Flare support surface
Flare support surface
Single, lip
Flare diameter
(maximum) (minimum)
GB 5658-86
Copper tube
Manufacturing department
Position width
(maximum)
(minimum)
±0.251.5
Allowed to use
1568×104Www.bzxZ.net
980×104
784 × 104
490×10
343×10
《大）
Carbon steel pipe
Manufacturing department
(generally small)
Note: ① The types and sizes specified in Figure A1, Figure A2 and the above table are applicable to various expansion pipe joints of GB5625~5653一85. Allowed to use
1568×104
1176×104
980×104
784 ×104
490×10
③The dimensions and tolerances of the copper ridge shall comply with the provisions of GB1527-79 "Drawn Copper" and GB152B-79 "Extruded Copper Tube", and the dimensions and tolerances of the carbon steel tube shall comply with the provisions of YB231-70 "Seamless Steel Tube". ③When selecting the wall thickness of the pipe, the user should consider the working pressure and the length of the connecting thread of the joint body. ④The pipe wall dimensions in the table are the maximum push thickness dimensions that match the flaring dimensions specified in Figures A1 and A2. ③The values in brackets in the "Allowable Use Pressure" column in the table are in kgf/cm. ①The circular motion tolerance of the flared inner surface axis relative to the outer diameter axis of the pipe is 0.38mm (indicator reading), as shown in Figure A3. The flared edge should be deburred and the sharp edge should be blunted. The inner surface of the flared and the intersection of the inner surface and the inner diameter of the pipe should be free of cracks, metal folds, dents, scratches and other surface defects that affect the sealing performance.
GB5653-85
Pipe rotates 360°
GB 6653—85
Appendix B
Hydraulic, pneumatic systems and components oil port structure and dimensions (reference part)
B.1 Hydraulic, pneumatic systems and components oil port structure and dimensions Refer to Figure B1 Oil port structure and dimensions and the following table:?bo.1
Recommended minimum true diameter of hole or shoulder [
R = 0.1 0,2
M10×1
M27×2
M33×2
M42×2
/ 45 ± 5°
(minimum)
M50 ×2 (M48 ×2)
M60 ×2
Used when the thread is not allowed to pass through the whole
Cuff structure and size
(maximum)
(minimum)
Note, ①The thread series size in the above table conforms to the provisions of GB2878.1-83 "Hydraulic and pneumatic systems and components-cuff (gas) port connection thread size". ②The oil port structure and size of Figure B1 conform to the provisions of 150 6149-1980 "Hydraulic and pneumatic systems and components oil port size and structure". ③The tapered diameter U surface should be free of longitudinal and spiral processing grooves, and annular scratches with a roughness of 0.6n are allowed. GB565365
④If the cuff surface is a processing surface, there is no S size. ③The tap hole depth P given in the table is suitable for flat-bottomed taps to ensure the full thread length. When using a standard tap, p needs to be increased accordingly.
③When designing new products, it is not recommended to use the thread size in brackets. B.? For application examples of hydraulic and pneumatic systems and component oil port structures and sizes, see Figure B2 for several examples of sealing methods. Example 1
GB3452-82
0-shaped ketone seal
JB982-77
Combination gasket seal
Sharp angle seal
Figure B2 Examples of several sealing methods
JB I0277
Soft metal gasket seal
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