1 Scope
This standard specifies the classifications, basic parameters, technical requirements, test methods, inspection rules and requirements for packing and transport of single-acting and double-acting hydraulic cylinders.
This standard is applicable to the single-acting and double-acting hydraulic cylinders with the nominal pressure being less than 31.5MPa and the operating medium being hydraulic oil or other mineral oils with equivalent performances. The hydraulic cylinder with the nominal pressure higher than 31.5MPa may refer to this standard. Special requirements other than those specified in this standard shall be negotiated by the manufacturer and the user of the hydraulic cylinder.
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 corrections to), 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 editions of these documents are applicable. For undated references, the latest editions of the normative documents referred to apply.
GB/T 786.1 "Fluid Power Systems and Components -- Graphic Symbols and Circuit Diagrams -- Part 1: Graphic Symbols for Conventional Use and Data Processing Applications" (GB/T 786.1-2009, ISO 1219-1: 2006, IDT)
GB/T 2346 "Fluid Power Systems and Components -- Nominal Pressures" (GB/T 2346-2003, ISO 2944: 2000, MOD)
GB/T 2348 "Fluid Power Systems and Components -- Cylinder Bores and Piston Rod Diameters" (GB/T 2348-1993, neq ISO 3320: 1987)
GB/T 2350 "Fluid Power Systems and Components -- Cylinders, Piston Rod Thread Dimensions and Types" (GB/T 2350-1980, eqv ISO 4395: 1978)
GB/T 2828.1-2003 "Sampling Procedures for Inspection by Attributea -- Part 1: Sampling Schemes Indexed by Acceptance Quality Limit (AQL) for Lot-by-lot Inspection" (ISO 2859-1: 1999, IDT)
GB/T 2878 "Fluid Power Systems and Components -- Ports -- Dimensions and Design" (GB/T 2878-1993, neq ISO 6149: 1980)
GB/T 2879 "Hydraulic Fluid Power -- Cylinder -- Housing for Piston and Rod Seals in Reciprocating Applications -- Dimensions and Tolerances" (GB/T 2879-2005, ISO 5597: 1987, IDT)
GB/T 2880 "Hydraulic Fluid Power -- Cylinder Rod and Piston Seals for Reciprocating Applications--Dimensions and Tolerances of Housing--Narrow Section Series"
GB/T 6577 "Hydraulic Fluid Power -- Cylinders -- Piston Seal Housings Incorporating Bearing Rings -- Dimensions and Tolerances" (GB/T 6577-1986, neq ISO 6574: 1981)
GB/T 6578 "Hydraulic Fluid Power -- Cylinder -- Reciprocating -- Housing for Rod Wipers -- Dimensions and Tolerances" (GB/T 6578-2008, ISO 6195: 2002, MOD)
GB/T 7935-2005 "Hydraulic Fluid Power -- General Requirements for Hydraulic Components"
GB/T 9286-1998 "Paints and Varnishes--Cross Cut Test for Films" (eqv ISO 2409: 1992)
GB/T 9969 "General Principles for Preparation of Instructions for Use of Industrial Products"
GB/T 13306 "Plates"
GB/T 14039-2002 "Hydraulic Fluid Power -- Fluids -- Method for Coding the Level of Contamination by Solid Particles" (ISO 4406: 1999, MOD)
GB/T 15622-2005 "Hydraulic Fluid Power -- Test Method for the Cylinders" (ISO 10100: 2001, MOD)
GB/T 17446 "Fluid Power Systems and Components -- Vocabulary" (GB/T 17446-1998, idt ISO 5598: 1985)
JB/T 7858-2006 "Method to Determine Cleanliness and Acceptance Criterions for Hydraulic Components"
3 Terms and Definitions
For the purposes of this standard, the terms and definitions given in GB/T 17446 and those below apply.
3.1
Sliding ring type combined seal
Foreword I
1 Scope
2 Normative References
3 Terms and Definitions
4 Items, Symbols and Units
5 Classifications, Marks and Basic Parameters
5.1 Classifications
5.2 Marks
5.3 Basic Parameters
6 Technical Requirements
6.1 General Requirements
6.2 Performance Requirements
6.3 Assembly Quality
6.4 Appearance Requirements
7 Performance Test Methods
7.1 Test Apparatus
7.2 Test Oil
7.3 Test Items and Test Methods
8 Inspection Methods for Assembly and Appearance
9 Test Report
10 Inspection Rules
10.1 Inspection Classification
10.2 Sampling
10.3 Judgment Rules
11 Mark, Operation Instruction, Package, Storage and Transport
12 Labeling Explanation (in Referring to this Standard)
Bibliography
Figure 1 Horizontal Loading Test Apparatus for the Loading Cylinder
Figure 2 Characteristic Curve for Load Efficiency
Table 1 Items, Symbols and Units
Table 2 Breakaway Pressure of the Double-acting Hydraulic Cylinder, MPa
Table 3 Breakaway Pressure of the Piston-type Single-acting Hydraulic Cylinder, MPa
Table 4 Breakaway Pressure of the Plunger-type Single-acting Hydraulic Cylinder, MPa
Table 5 Breakaway Pressures of the Multilevel Sleeve-type Single-acting and Double-acting Hydraulic Cylinders, MPa
Table 6 Inner leakage of the Double-acting Hydraulic Cylinder
Table 7 Inner leakage of the Piston-type Single-acting Hydraulic Cylinder
Table 8 Cleanliness Index
Table 9 Stroke Length Tolerance, mm
Table 10 Allowable Error of the Measurement System
Table 11 Allowable Variation Scope of the Average Displayed Value of Controlled Parameter
Table 12 Inspection Methods for Assembly and Appearance
