GB/T 15623-1995 Hydraulic fluid power-Servovales-Test methods

GB/T 15623.2-2003 Hydraulic fluid power-Electrically modulated hydraulic control valves—Part 2:Test methods for three-way directional flow control valves GB/T 15623.1-2003 Hydraulic fluid power-Electrically modulated hydraulic control valves—Part 1:Test methods for four-way directional flow control valves

GB 3100-1993 SI units and recommendations for the use of their multiples and of certain other units GB/T 3101-1993 Quantities and units—General principles GB/T 3102.1-1993 Quantities and units—Space and time GB/T 3102.2-1993 Quantities and units—Periodic and related phenomena GB/T 3102.3-1993 Quantities and units—Mechanics GB/T 3102.4-1993 Quantities and units—Heat GB/T 3102.5-1993 Quantities and units—Electricity and magnetism GB/T 3102.6-1993 Quantities and units—Light and related electromagnetic radiations GB/T 3102.7-1993 Quantities and units—Acoustics GB/T 3102.8-1993 Quantities and units—Physical chemistry and molecular physics GB/T 3102.9-1993 Quantities and units—Atomic and nuclear physics GB/T 3102.10-1993 Quantities and units—Nuclear reactions and ionizing radiation GB/T 3102.11-1993 Mathematical signs and symbols for use in the physical sciences and technology GB/T 3102.12-1993 Characteristic numbers GB/T 3102.13-1993 Quantities and units—Solid state physics GB/T 786.1-1993 Fluid power systems and components—Graphic symbols and circuit diagrams—Part 1:Graphic symbols GB/T 786.1-2009 Fluid power systems and components—Graphic symbols and circuit diagrams—Part 1:Graphic symbols for conventional use and data-processing applications GB/T 786.1-2021 Fluid power systems and components—Graphical symbols and circuit diagrams—Part 1:Graphical symbols GB/T 3141-1994 Industrial liquid lubricants—ISO viscosity classification GB/T 7935-2005 Hydraulic fluid power—General requirements for hydraulic components GB/T 14039-2002 Hydraulic fluid power—Fluids—Method for coding the level of contamination by solid particles