GB/T 786.1-2021Fluid power systems and components - Graphical symbols and circuit diagrams - Part 1: Graphical symbols (English PDF)

6.1.2.13 of the year version);

---Modified the two-way arrow in the two-position three-way directional control valve to a one-way arrow, and the direction of the one-way valve was changed

(See 6.1.2.17, 6.1.2.17 of the.2009 edition);

--- Deleted one example of "Proportional directional control valve, direct control" (see 6.1.6.2 of the.2009 edition);

--- Deleted the leaking fuel tank in the control element of the servo valve example (see 6.1.6.4 of the.2009 edition);

---Modified the stepper motor drive symbol (see 6.1.6.6, 6.1.6.6 of the.2009 edition);

---The leaking fuel tank with the graphic symbol of the three-way proportional pressure reducing valve has been added (see 6.1.7.5);

---Modified the two control elements of the proportional relief valve, arranged them separately, and placed the additional pilot stage in the upper right corner of the function position, with electronic

The pilot stage of the magic weapon is placed below the right side of the function position (see 6.1.7.6, 6.1.7.6 in the.2009 version);

---Deleted the import and export extension line of the non-initial function position of the graphic symbol (see 6.1.8.1 and 7.1.8.1 of the.2009 edition);

---Modified the pressure reducing cartridge valve plug-in (spool valve structure, normally closed, with integrated check valve) The dotted line of port A is a solid line (see 6.1.9.11,

6.1.9.11 of the.2009 version);

---Added the X port extension line (dotted line) of the control cover with pilot port (see 6.1.9.14 and 6.1.9.15);

---The dashed line in the shuttle valve is modified as a solid line (see 6.1.9.17, 6.1.9.18 and 6.1.9.19, the.2009 version of 6.1.9.17, 6.1.9.18

And 6.1.9.19);

---The solid line of the reversing valve port is modified as a dashed line (see 6.1.9.24, 6.1.9.25 and 6.1.9.27, the.2009 version of 6.1.9.24,

6.1.9.25 and 6.1.9.27);

---Modified the two-way cartridge valve (with pressure reducing function, low pressure control) in the solid line connection of A and B ports to be disconnected (see 6.1.9.30,.2009

6.1.9.30 of the year version);

---The solid line of the pilot control pipeline of the graphic symbol in the application example is modified as a dashed line (see 7.1.2.19, 7.1.2.20, 7.1.2.22

7.1.2.23, 7.1.3.4, 7.1.2.19, 7.1.2.20, 7.1.2.22, 7.1.2.23, 7.1.3.4 of the.2009 version);

---The dotted line of the pilot control port of the air pressure reset is modified as a dotted line (see 7.1.1.9, 7.1.1.9 of the.2009 edition);

---The solid line of the external pressure source of the air pressure reset is modified as a dashed line (see 7.1.1.10, 7.1.1.10 of the.2009 edition);

---The solid line of the internal control line is modified as a dashed line (see 7.1.2.5, 7.1.2.10 and 7.1.2.11, 7.1.2.5, 7.1.2.10 of the.2009 edition

And 7.1.2.11);

---The example of median function is deleted (see 7.1.2.15 and 7.1.2.21 of the.2009 edition);

---Added a solid hollow triangle sign indicating the source of air pressure at the entrance and exit (see 7.2.1 and 7.2.2);

--- Deleted the "anti-cavitation relief valve used to protect the two supply pipelines" example (see 7.1.3.5 of the.2009 edition);

--- Added two new application examples (see 7.3.21 and 7.3.22);

---Modified the drawing method of the entry and exit lines of the graphical symbol of the "differential pressure gauge".

7.4.3.5, 7.4.3.5 of the.2009 version);

---Modified the graphical symbol drainage line of "manual drainage separator", and changed the solid line to a dashed line (see 7.4.4.19,.2009 edition

7.4.4.19);

---The angle and size of the arrow indicating the "flow path" in the "indication of flow path and direction" have been added (see 8.3);

---Modified the size of "diaphragm, capsule" from 5M to 2.5M (see 8.4.29, 8.4.29 in the.2009 edition);

--- Added two new basic element symbols (see 8.4.63 and 8.4.64);

---Modified the graphic symbol of "air pressure boost brake mechanism", which indicates that the solid line of the pilot control air source is a dashed line (see 8.5.29,.2009)

Version 8.5.29);

---Added an example of indicating application instructions (see 8.5.30, 8.5.31 and 8.5.32);

---The angle and size of the arrow indicating "adjustable" in the "adjustment element" have been added (see 8.6);

---Added the "Electrical Digital Output Signal" to represent the digital signal

Points. Graphical Symbols for General Purposes and Data Processing Applications.

The Chinese documents that have a consistent correspondence with the international documents cited in this section are as follows.

---GB/T 4457.2-2003 Technical drawing, the basic provisions of the drawing method guideline and datum line (ISO 128-22.1999,

IDT)

---GB/T 4457.4-2002 Mechanical drawing drawing method drawing line (ISO 128-24.1999, MOD)

---GB/T 4458.1-2002 mechanical drawing drawing method view (ISO 128-34.2001, MOD)

---GB/T 4458.6-2002 Mechanical Drawing Drawing Method Sectional View and Sectional View (ISO 128-44.2000, MOD)

---GB/T 16901.1-2008 Graphical symbols for technical documents Part 1.Basic rules (ISO 81714-1.

1999, MOD)

---GB/T 16901.2-2013 Graphical symbols representation rules for technical documents Part 2.Graphical symbols (including reference symbols

Graphical symbols in the library) computer electronic file format specification and its exchange requirements (IEC 81714-2.2006, MOD)

---GB/T 17446-2012 Fluid Power System and Components Vocabulary (ISO 5598.2008, IDT)

---GB/T 17450-1998 technical drawing line (idtISO 128-20.1996)

---GB/T 17453-2005 Technical drawing, drawing method, representation of section area (ISO 128-50.2001, IDT)

---GB/T 18594-2001 Technical product document font Latin letters, numbers and symbols CAD fonts (ISO 3098-5.

1997, IDT)

---GB/T 18686-2002 Technical drawing CAD system with graphical representation (ISO 128-21.1997, IDT)

---GB/T 20063 (all parts) Graphical symbols for diagrams [ISO 14617 (all parts)]

This section has made the following editorial changes.

---Incorporated the amendments of ISO 1219-1.2012/Amd.1.2016, and the outer margins of the clauses involved use vertical

The straight double line (||) is marked;

---Modified the standard name.

This part was proposed by China Machinery Industry Federation.

This part is under the jurisdiction of the National Hydraulic and Pneumatic Standardization Technical Committee (SAC/TC3).

Drafting organizations of this section. Yanshan University, Youweili Hydraulic Technology Co., Ltd., Wuhan University of Science and Technology, Beijing Huade Hydraulic Industry Group

Co., Ltd., Shandong University of Technology, Guangdong Shaoguan City Quality and Metrology Supervision and Inspection Institute, Beihang University, Qinhuangdao Yanda Yihua

Mechanical and Electrical Engineering Technology Research Institute Co., Ltd., Liaoning Donggang Hongda Hydraulic Cylinder Remanufacturing Co., Ltd., Beijing Machinery Industry Automation Research Co., Ltd.

Limited company.

5.1 Use the basic elements and rules specified in this section to create component symbols.