First, the standard situation:
Idt or IDT means equivalent use; eqv or MOD means equivalent or modified; neq means non-equivalent.
Second, the national standard
GB/T 786.1-1993 (2001*) hydraulic and pneumatic graphic symbols
Eqv ISO 1219-1:1991
GB/T 2346-2003 Nominal pressure series for fluid transmission systems and components
ISO 2944:2000, MOD
GB/T 2347-1980(1997) Hydraulic Pump and Motor Nominal Discharge Series
Eqv ISO 3662:1976
GB/T 2348-1993 (2001*) Hydraulic and Pneumatic Systems and Element Internal Diameter and Piston Rod Diameter
Neq ISO 3320:1987
GB/T 2349-1980(1997) Hydraulic Pneumatic System and Element Cylinder Piston Travel Series
Eqv ISO 4393:1978
GB/T 2350-1980(1997) Hydraulic Pneumatic Systems and Elements Piston Rod Thread Types and Dimension Series
Eqv ISO 4395:1978
GB/T 2351-1993 Hard tube outer diameter and hose inner diameter for hydraulic pneumatic systems
Neq ISO 4397:1978
GB/T 2352—2003 Pressure and volume ranges and characteristic quantities of hydraulically-actuated isolated accumulators
ISO 5596:1999, IDT
GB/T 2353.1-1994 Size series and markings for flanges and shafts of hydraulic pump and motor mounting flanges
Neq ISO 3019-2:1986 front part: two- and four-hole flanges and shaft extensions
GB/T 2353.2-1993 (2001*) Size series and markings of flanges and shafts for hydraulic pump and motor mounting flanges (2)
Neq ISO 3019-3:1988 polygonal flanges (including circular flanges)
GB/T 2514-1993 Four Oil Plate Hydraulic Directional Control Valve Mounting Surface
Eqv ISO 4401:1980
GB/T 2877-1981 Two-way cartridge hydraulic valve installation and connection dimensions
GB/T 2878-1993 Hydraulic components thread connection type and size
Neq ISO 6149:1980
GB/T 2879-1986 Hydraulic cylinder piston and piston rod dynamic seal groove types, dimensions and tolerances
Neq ISO 5597:1987
GB/T 2880-1981 Hydraulic cylinder pistons and piston rods, narrow profile, dynamic seal groove series and tolerances
GB/T 3452.1-1992 O-Rubber Rubber Seals for Hydraulic and Pneumatic Size Series and Tolerances
Neq ISO 3601-1: 1988
GB/T 3452.2-1987 O-shaped rubber seal appearance quality inspection standards
GB/T 3452.3-1988 Hydraulic O-Rubber O-Ring Groove Groove Size and Design Calculation Criteria
Neq ISO/DIS 3601-2
GB/T 3766-2001 General technical conditions of hydraulic system
Eqv ISO 4413: 1998
GB/T 6577-1986 Hydraulic cylinder pistons with support ring seal groove type, dimensions and tolerances
Neq ISO 6547:1981
GB/T 6578-1986 Hydraulic cylinder piston rod wiper groove type, dimensions and tolerances
Neq ISO 6195:1986
GB/T 7932-2003 General technical conditions for pneumatic systems
ISO 4414:1998, IDT
GB/T 7934-1987 Technical requirements for two-way plug-in hydraulic valve
GB/T 7935-1987 General technical conditions for hydraulic components
Neq NFPA T 310.3
GB/T 7936-1987 Test method for no-load displacement of hydraulic pumps and motors
Neq ISO/DP 8426 (1988 edition)
GB/T 7937-2002 Hydraulic and pneumatic fittings and related components Nominal pressure series
Neq ISO 4399:1995
GB/T 7938-1987 Nominal pressure series for hydraulic cylinders and cylinders
Neq ISO 3322:1975
GB/T 7939-1987 Hydraulic hose assembly test method
Neq ISO 6605:1986
GB/T 7940.1-2001 Pneumatic five-port pneumatic directional control valve front part: mounting surface without electrical connector
Idt ISO 5599-1:1989
GB/T 7940.2-2001 Pneumatic five-port pneumatic direction control valve Part 2: Mounting surface with electrical connector
Idt ISO 5599-2:1990
GB/T 7940.3-2001 Pneumatic five-port pneumatic directional control valve Part 3 Functional identification code system
Idt ISO 5599-3:1990
GB/T 8098-2003 Hydraulic Transmission Belt Compensated Flow Control Valve Mounting Surface
ISO 6263:1997, MOD
GB/T 8099-1987 Hydraulic superimposed valve mounting surface
Neq ISO 4401-1980
GB/T 8100-1987 Plate coupling hydraulic pressure control valve (excluding overflow valve), sequence valve,
Neq ISO/DIS 5781 (1987) Unloading valve, throttle valve and check valve mounting surface
GB/T 8101-2002 hydraulic relief valve mounting surface
ISO 6264:1998,MOD
GB/T 8102-1987 Installation size of single-rod cylinder with inner diameter of 8～25mm
Neq ISO 6432:1985
GB/T 8104-1987 Flow control valve test method
Neq ISO/DIS 6403 (1988)
GB/T 8105-1987 Pressure control valve test method
Neq ISO/DIS 6403 (1988)
GB/T 8106-1987 Directional control valve test method
Neq ISO/DIS 6403 (1988)
GB/T 8107-1987 Hydraulic valve differential pressure - flow characteristics test method
Neq ISO/DIS 4411 (1986)
GB/T 9065.1-1988 Hydraulic Hose Connector Dimensions Flaring Type
GB/T 9065.2-1988 Hydraulic Hose Connector Size Adapter
GB/T 9065.3-1988 Hydraulic hose connector connection size welded or quick-change
GB/T 9094-1988 (1997) Hydraulic cylinder cylinder installation size and installation type code
Eqv ISO 6099:1985
GB/T 9877.1-1988 Rotary Shaft Lip Seals Dimension Series Front Flange Rotating Shaft Lip Seals
GB/T 9877.2-1988 Rotary shaft lip seals Dimension series Part 2 Exposed skeleton Rotary shaft Lip seals
GB/T 9877.3-1988 Rotary Shaft Lip Seals Dimension Series Part Three Assembly Rotating Shaft Lip Seals
GB/T 24° non-flaring hydraulic fittings connection dimensions
GB/T Hydraulic cylinder piston rod end with spherical bearing earring mounting dimensions
Neq ISO 6982:1982
GB/T(2001) Cylinder Air Port Thread
Neq ISO 7180:1986
GB/T Hydraulic transmission oil solid particle pollution class code
ISO 4406:1999,MOD
GB/T 14041.1-1993 Hydraulic filter core structural integrity test method
Neq ISO 2942:1974
GB/T 14041.2-1993 Hydraulic filter material and liquid compatibility test method
Neq ISO 2943: 1974
GB/T 14041.3-1993 (2001) Inspection method for rupture resistance of hydraulic filter
Neq ISO 2941: 1974
GB/T 14041.4-1993 (2001) Test method for rated axial load of hydraulic filter
Neq ISO 3723:1976
GB/T (2001) Hydraulic cylinder piston rod end pin earring installation dimensions
Neq ISO 6981:1982
GB/T Hydraulic control valve mounting surface identification code
Eqv ISO 5783:1981
GB/T (2001) Determination of flow characteristics of pneumatic components
Neq ISO/DIS 6358 (1989)
GB/T 14514.1-1993 (2001) Test methods for pneumatic fittings
Neq JIS 8381-85
GB/T 14514.2-1993 (2001) Test method for pneumatic quick-change joints
Neq ISO 6150:1988
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