MT 419-1995 Hydraulic support valve

MT 119-1985 MT 177-1988 MT 178-1988 MT 179-1988

GB 1239.4 GB 1239.5 GB/T 197-2003 General purpose metric screw threads—Tolerances GB/T 197-2018 General purpose metric screw threads—Tolerances GB/T 321-1980 Preferred numbers and preferred number series GB/T 321-2005 Preferred numbers—Series of preferred numbers GB/T 699-1999 Quality carbon structural steels GB/T 699-2015 Quality carbon structure steels GB/T 1184-1996 Geometrical tolerancing—Geometrical tolerance for features without individual tolerance indications GB/T 1220-1992 Stainless steel bars GB/T 1220-2007 Stainless steel bars GB/T 1239.1-2009 Cold coiled helical springs technical specifications—Part 1:Extension spring GB/T 1239.2-2009 Cold coiled helical springs technical specifications—Part 2:Compressions spring GB/T 1239.3-2009 Cold coiled helical springs technical specifications—Part 3:Torsion spring GB/T 1804-2000 General tolerances for linear and angular dimensions without individual tolerance indications GB/T 2878-1993 Fluid power systems and components—Ports—Dimensions and design GB/T 2878.1-2011 Connections for hydraulic fluid power—Ports and stud ends with metric threads and O-ring sealing—Part 1:Ports GB/T 2878.2-2011 Connections for hydraulic fluid power—Ports and stud ends with metric threads and O-ring sealing—Part 2:Heavy-duty stud ends (S series) GB/T 2878.3-2017 Connections for hydraulic fluid power—Ports and stud ends with metric threads and O-ring sealing—Part 3:Light-duty stud ends (L series) GB/T 2878.4-2011 Connections for hydraulic fluid power—Ports and stud ends with metric threads and O-ring sealing—Part 4:Hex plugs GB 3452.1-1992 Fluid systems—Sealing devices—O-rings—Inside diameters, cross-sections, tolerances and size identification code GB/T 3452.1-2005 Fluid power systems—O-rings—Part 1:Inside diameters, cross-sections, tolerances and size identification code GB/T 3452.2-1987 Appearance quality acceptance criteria for rubber O-rings GB/T 3452.2-2007 Fluid power systems—O-rings—Part 2:Quality acceptance criteria GB/T 3452.3-2005 Housing dimensions for O-ring elastomer seals in hydraulic and pneumatic applications GB/T 9349-2002 Determination of thermal stabitity of poly(vinyl chloride) related chlorine-containing homopolymers and copolymers and their compounds—Discoloration method GB/T 11352-1989 Carbon steel castings for general engineering purposes GB/T 11352-2009 Carbon steel castings for general engineering purpose GB/T 13306-1991 Plates GB/T 13306-2011 Plates GB/T 13319-2003 Geometrical product specifications(GPS)—Geometrical tolerancing—Positional tolerancing GB/T 13319-2020 Geometrical product specifications(GPS)—Geometrical tolerancing—Pattern and combined geometrical specification MT/T 154.1-1992 The guidelines for the preparation of coal mine electromechanical product models and management measures JB/T 3338-2013 JB/T 3338-2013 Hydraulic Components Cylindrical Helical Compression Spring Technical Specification MT/T 154.1-2011 Coal mine electromechanical product model designation method Part 1: Guidelines JB/T 3338.1-1993 JB/T 3338.1-1993 - Technical Specification for Cylindrical Helical Compression Spring for Hydraulic Components JB/T 3338.2-1993 JB/T 3338.2-1993 Design and calculation of cylindrical spiral compression springs for hydraulic components MT 76-2002 Emulsifying oil, concentrates, and high water content hydraulic fluids for hydraulic supports (poles) MT/T 76-2011 Emulsifying oil,concentrate fluid and high-water content hydraulic fluid used for powered support GB/T 2878.1-2025 Connections for hydraulic fluid power—Ports with truncated housing and stud ends with metric threads—Part 1:Ports with truncated housing