Mechanical Industry Standard of the People's Republic of China JB/T 5922-1991 Graphic Symbols for Hydraulic Two-way Cartridge Valves Published on December 11, 1991 Implementation by the Ministry of Machinery and Electronics Industry of the People's Republic of China on July 1, 1992 Mechanical Industry Standard of the People's Republic of China Graphic Symbols for Hydraulic Two-way Cartridge Valves 1 Subject Content and Scope of Application This standard specifies the graphic symbols for two-way cartridge valves. JB/T5922-1991 This standard applies to two-way cartridge valves with hydraulic oil as the working medium. It is mainly used to draw the schematic diagram of hydraulic systems controlled by two-way cartridge valves. Referenced Standards GB786.1 Hydraulic and Pneumatic Graphic Symbols 3 Graphic Symbols 3.1 The graphic symbols for cartridges are shown in Table 1. 3.2 The graphic symbols of the control cover are shown in Table 2. 3.3 The graphic symbols of commonly used cartridge valves are shown in Table 3. 3.4 The graphic symbols of cartridge valve blocks are shown in Figure 1. 4 Graphic symbol drawing rules 4.1 Symbol elements and functional elements The solid isosceles triangle represents the valve core with a throttling window. Other symbol elements and functional elements shall comply with the provisions of GB786.1. 4.2 Graphic symbols of cartridges The basic dimensions of the graphic symbols of the cone valve cartridges with the valve core area ratio aa AA<1 are shown in Figure 2: The basic dimensions of the graphic symbols of the cone valve cartridges with Ax 4=1 are shown in Figure 3; b. The valve core area ratio aa= The valve core area ratio αA 4.3 Graphic symbols of control cover plates The basic dimensions of the graphic symbols of the sliding valve cartridges with the valve core area ratio αA =1 are shown in Figure 4. a. The basic dimensions of the graphic symbols of the control cover are shown in Figure 5: b. The graphic symbols of pilot control components such as shuttle valves, one-way valves, hydraulic one-way valves, throttles, and throttles with pressure compensation in the control cover can omit square, rectangular, and circular frames. 4.4 Combination of graphic symbols for cartridge valves 4.4.1 The upper edge of the control cavity in the cartridge symbol should be aligned with and centered on the bottom edge of the control cover symbol. 4.4.2 When the pilot control valve and other control components need to be combined on the control cover, the mounting surfaces should be aligned, and the corresponding control channels should be aligned. 4.5 Other provisions 4.5.1 Graphic symbols not included in this standard can be derived according to the symbol drawing rules and symbol examples specified in this standard. 4.5.2 When it is impossible to directly quote or derive, or when it is necessary to specifically explain the structure and working principle of a certain part, a structural diagram can be used to represent it locally. Approved by the Ministry of Machinery and Electronics Industry of the People's Republic of China on December 11, 1991 and implemented on July 1, 1992 JB/T 5922-1991 4.5.3 Except as otherwise specified, the size of symbols shall be based on the principle of clarity and aesthetics. When drawing, it may be processed according to actual conditions, but the appropriate proportions of the various parts of the graphic should be maintained. Table 1 Graphic symbols of plug-in parts Cone valve with αA<1 Cone valve with a throttling hole in the valve core Cone valve with a throttling window Cone valve with a connecting hole in the valve core Cone valve with a feedback spring and a throttling window in the valve core Cone valve with aA=I Cone valve with a throttling hole in the valve core Graphic symbol AA: Effective area at A oil port Ag: Effective area at B oil port Ax: Effective area at X control chamber Generally used for directional control and pressure control Generally used for directional control and flow control Generally used for directional control Generally used for Force feedback proportional flow control Generally used for pressure control and direction control Generally used for pressure control Spool with throttling window (A=1 slide valve Directional valve basic cover With embedded pilot hydraulic control One-way element cover With embedded shuttle element With stroke adjustment device Basic cover Cover for mounting four-port directional valve JB/T5922-1991 Continued Table 1 Graphic symbols Table 2 Graphic symbols of control cover Graphic symbols Generally used for pressure, flow and direction controlGenerally used for reduction Pressure valve or pressure compensator With throttling screw For directional valve For pressure selection For flow control (the symbol of the stroke adjustment device can be drawn on the upper side of the left and right corners) Cover plate with shuttle element for mounting three-port directional valve Basic cover plate for pressure valve Pressure control cover plate for mounting three-position four-way solenoid direction valve and having high and low pressure selection function Basic cover plate for pressure reducing valve with micro flow control Pressure reducing valve for mounting three-position four-way solenoid direction valve and having high and low pressure selection function Control cover plate Check valve JB/T 5922-1991 Continued Table 2 Graphic symbols Feng 2 Shui 92 Table 3 Typical cartridge valve graphic symbols Example Graphic symbols This valve consists of a cone valve cartridge with an area ratio of α<1 and a basic cover plate. With one-way function Directional flow compound control Pressure control valve Pressure control valve Proportional flow control valve JB/T5922-1991 Continued Table 3 Graphic symbols This valve consists of a cone valve cartridge with a valve core area ratio of α<1 and a throttling window, a control cover plate with a stroke adjustment device and a two-position three-way electromagnetic pilot valve (ball type). It has the functions of two-position two-way directional control and throttling control. The valve consists of a cone-shaped insert with a valve core area ratio of α=1, a pressure reducing valve control cover with high and low pressure selection function, a superimposed pressure regulating valve and a three-position four-way solenoid reversing valve (sliding valve type). It has the functions of high and low pressure selection and unloading control. The valve consists of a sliding valve insert with α=1 and a control cover with a micro-flow controller and a pilot pressure regulating valve. Pressure reducing valve with constant pressure output This valve is composed of a cone valve cartridge with feedback spring and throttling window with α<1, and a control cover with a two-way proportional pilot valve. It is a displacement-force feedback proportional throttle valve JB/T5922-1991 Figure 1 Example of graphic symbols for cartridge valve blocks Figure 2 Graphic symbol for cone valve cartridge with valve core area ratio α 4A<1 Basic size Ax JB/T5922-1991||t t||Valve core area ratio αA= =1Conical valve cartridge basic dimensions of graphic symbolsAx Sliding valve cartridge basic dimensions of graphic symbolsAx =1Figure 4 Valve core area ratio αA=bzxZ.net JB/T5922-1991 Basic dimensions of graphic symbols for control cover Note: The symbols of pilot control components embedded in the cover can be found in Table 2 and comply with the provisions of GB786.1. Additional instructions: This standard is proposed and managed by the National Hydraulic and Pneumatic Standardization Technical Committee. This standard was drafted by the 704th Institute of the 7th Research Institute of China State Shipbuilding Corporation. The main drafters of this standard are Huang Renhao and Yu Weitang. People's Republic of China Mechanical Industry Standard Graphical Symbols for Hydraulic Two-way Cartridge Valves JB/T 59221991 Published and issued by the China Academy of Mechanical Science Printed by the China Academy of Mechanical Science (No. 2 Shouti South Road, Beijing Postal Code 100044) Format 880×1230 Print Sheet 3/4 Word Count 16.000 First Edition in June 1992 First Printing in June 1992 Print Quantity 1-500 Price 5.00 Yuan Mechanical Industry Standard Service Network: http://swww.JB.ac.cn1661_6 Tip: This standard content only shows part of the intercepted content of the complete standard. If you need the complete standard, please go to the top to download the complete standard document for free.