1 Scope
This standard specifies the structural type, basic dimension, performance, test requirements, marking and etc. of steel O-ring face seal fittings with tube outside diameter of 6~50mm.
This standard is applicable to the connection with O-ring face seal fittings with working medium of hydraulic oil (solution), working temperature range of -20~+100℃ and pressure from 6.5kPa absolute vacuum pressure to the working pressure listed in Table 11.
2 Normative References
The following normative documents contain provisions which, through reference in this text, constitute provisions of this standard. For dated references, subsequent amendments to (excluding amending errors in the text), or revisions of, any of these publications do not apply. However, all parties coming to an agreement according to this standard are encouraged to study whether the latest edition of the normative document is applicable. For undated references, the latest edition of the normative document applies.
GB/T 3 Run-outs, Undercuts and Chamfers for General Purpose Metric Screw Threads (GB/T 3-1997, eqv ISO 3508: 1976, ISO 4755: 1983)
GB/T 196 General Purpose Metric Screw Threads - Basic Dimensions (GB/T 196-2003, ISO 724: 1993, MOD)
GB/T 197 General Purpose Metric Screw Threads-Tolerances (GB/T 197-2003, ISO 965-1: 1998, MOD)
GB/T 230.1 Metallic Rockwell Hardness Test - Part 1: Test Method (Scales A, B, C, D, E, F, G, H, K, N, T) (GB/T230.1-2004, ISO 6508-1: 1999, MOD)
GB/T 699 Quality Carbon Structural Steels
GB/T 905-1994 Dimension, Shape, Weight and Tolerance for Cold-drawn Round, Square and Hexagonal Steels (neq ISO 286-1: 1988)
GB/T 1184-1996 Geometrical Tolerancing - Geometrical Tolerance for Features without Individual Tolerance Indications (neq ISO 2768-2:1989)
GB/T 1220 Stainless Steel Bars
GB/T 1804-2000 General Tolerances - Tolerances for Linear and Angular Dimensions without Individual Tolerance Indications (neq ISO 2768-1: 1989)
GB/T 3141 Industrial Liquid Lubricants - ISO Viscosity Classification (GB/T 3141-1994, eqv ISO 3448: 1992)
GB/T 3452.1-1992 Fluid Systems - Sealing Devices - O-rings - Inside Diameters, Cross-sections, Tolerances and Size Identification Code (neq ISO 3601-1: 1988)
GB/T 3639 Seamless Cold-drawn or Cold-rolled Steel Tubes for Precision Applications (neq DIN 2391/1-1994, DIN 2391/2-1994)
GB/T 5231 Wrought Copper and Copper Alloys Chemical Composition Limits and Forms of Wrought Products
GB/T 5568 Rubber or Plastics Hoses and Hose Assemblies - Hydraulic-pressure Impulse Test without Flexing (GB/T 5568-1994, neq ISO/DIS 6803: 1991)
GB/T 6031 Rubber, Vulcanized or Thermoplastic - Determination of Hardness (Hardness between 10IRHD and 100IRHD) (GB/T 6031-1998, idt ISO 48: 1994)
GB/T 10125 Corrosion Tests in Artificial Atmospheres - Salt Spray Test (eqv ISO 9217: 1990)
GB/T 17446-1998 Fluid Power Systems and Components - Vocabulary (idt ISO 5598: 1985)
ISO 6149-2 Connections for Hydraulic Fluid Power and General Use - Ports and Stud Ends with ISO 261 Metric Threads and O-ring Sealing - Part 2: Dimensions, Design, Test methods and Requirements for Heavy-duty (S series) Stud Ends
3 Terms and Definitions
For the purpose of this standard, the terms and definitions established in GB/T 17446as well as those listed below apply.
3.1
Fluid power
The mode or method where energy is conversed, transmitted, controlled and distributed by using a pressurized fluid as the medium, which is referred to as hydraulic and pneumatic for short.
3.2
Working pressure
The pressure at which the device operates.
3.3
Connection; fitting
The leak-proof device to connect pipeline to one other, or to component.
3.4
Fitting body
The part exerting the main connection function in a fitting. A fitting body may be a fitting or part of a fitting.
3.5
Assembly torque
The torque applied to obtain satisfactory assembly.
3.6
Adjustable stud end
The stud end connection fitting that allows for fitting direction adjustment before tightening of the nut to complete the connection. Generally, this type of stud end is only used on fittings such as tees, crosses and elbows.
3.7
Non-adjustable stud end
The stud end connection fitting that does not require specific direction adjustment before tightening. It is only used on straight fittings.
Foreword I
1 Scope
2 Normative References
3 Terms and Definitions
4 Types and Dimensions of Fittings
4.1 Labelling Method of Fitting
4.2 Types and Connection Dimensions of Fittings
5 Material Requirements
5.1 Fitting Bodies
5.2 Nuts
5.3 O-rings
6 Pressure/Temperature Requirements
7 Steel tube requirements
8 Dimensional Tolerance
8.1 Hexagonal Opposite Side Dimension
8.2 Angle Tolerance
8.3 Deviation of Bore Joint
8.4 Tolerance not Indicated
9 Thread
10 Manufacturing
10.1 Manufacturing
10.2 Process
10.3 Surface Treatment
10.4 Fitting Protection
10.5 Chamfering
11 Performance or Type Test
11.1 Performance Requirements
11.2 Test Report
12 Marking
13 Note Explanation (Reference to This Standard)
Appendix A (Normative) Test Record Sheet for O-ring Face Seal Fittings
Appendix B (Informative) Comparison Table for O-ring Face Seal Fittings Before and After Revision
Appendix C (Informative) Stud End information
C.1 Stud End with Sealed with General Purpose Thread Compound Gasket
C.2 Stud End Sealed with General Purpose Thread Rubber Gasket
C.3 Stud End Sealed with 55° Non-sealed Tube Thread Compound Gasket
C.4 Stud End Sealed with 55° Non-sealed Tube Thread Rubber Gasket
C.5 Stud End Selection
Figure 1 Typical Connection Mode and Structure
Figure 2 Structure of O-ring Face Seal Fitting End
Figure 3 Welded Tube HJG
Figure 4 Connecting Nut JLM
Figure 5 Straight Fitting ZTJ
Figure 6 Right-angle Fitting ZJJ
Figure 7 Tee Fitting SAJ
Figure 8 Cross Fitting SIJ
Figure 9 Straight Bulkhead Fitting ZGJ
Figure 10 Right-angle Bulkhead Fitting JGJ
Figure 11 45° Bulkhead Fitting 4GJ
Figure 12 Tee Branch Bulkhead Fitting SFG
Figure 13 Tee Main Bulkhead Fitting SZG
Figure 14 Schematic Diagram for Bulkhead Fitting Assembling
Figure 15 Flat Nut BLM
Figure 16 Washer DQG
Figure 17 Stud End Straight Fitting ZZJ
Figure 18 45° Adjustable Stud End Fitting 4TJ
Figure 19 Right-angle Adjustable Stud End Fitting JTJ
Figure 20 Tee Branch Adjustable Stud End Fitting SFT
Figure 21 Tee Main Adjustable Stud End Fitting SZT
Figure 22 Schematic Diagram for Adjustable Stud End Assembling
Figure 23 Flat Nut 1
Figure 24 Non-adjustable Stud End
Figure 25 Adjustable Stud End
Figure 26 Right-angle Flexible Fitting JHJ
Figure 27 Tee Branch Flexible Fitting SFH
Figure 28 Tee Main Flexible Fitting SZH
Figure 29 Structure of Flexible Fitting End
Figure 30 Straight Welded Fitting ZWJ
Figure 31 Right-angle Welded Fitting JWJ
Figure C.1 Type A Stud End
Figure C.2 Type E Stud End
Table 1 Names and Codes of Fittings
Table 2 Dimension of O-ring Face Seal Fitting End
Table 3 Dimension of Welded Tube
Table 4 Dimension of Connecting Nut
Table 5 Dimensions of O-ring Face Seal Fittings
Table 6 Dimensions of O-ring Face Seal Bulkhead Fittings
Table 7 Dimensions of O-ring Face Seal Stud End Fittings
Table 8 Dimensions of O-ring Face Seal Flexible Fittings
Table 9 Dimensions of O-ring Face Seal Welded Fittings
Table 10 Recommendation of Common Fitting Materials
Table 11 Working Pressure of O-ring Face Seal Fitting
Table 12 Dimensional Deviation of Outside Diameter of Steel Tube
Table 13 Dimensional Tolerance for Opposite Side of Die Forging
Table 14 Test Pressure of O-ring Face Seal Fitting
Table 15 Torque Requirements
Table B.1 Comparison Table for O-ring Face Seal Fittings Before and After Revision
