This standard specifies the graphic symbols for valves and pipe accessories, refrigeration units, auxiliary equipment, control components, etc. for refrigeration. This standard is applicable to drawing flowcharts and schematic diagrams of refrigeration systems and compiling corresponding technical documents. JB/T 7965-1995 Graphical symbols for refrigeration JB/T7965-1995 Standard download decompression password: www.bzxz.net

Mechanical Industry Standard of the People's Republic of China
Graphic Symbols for Refrigeration
1 Subject Content and Scope of Application
JB/T 7965—95
This standard specifies the graphic symbols for valves and pipe accessories, refrigeration units, auxiliary equipment, control elements, etc. for refrigeration. This standard is applicable to drawing flowcharts, schematic diagrams of refrigeration systems and compiling corresponding technical documents. 2 Reference Standards
GB4270 Thermal Graphic Symbols and Text CodesGB4457.4 Mechanical Drawing Lines
GB4458.4 Mechanical Drawing Dimensioning Method
GBJ114 Heating, Ventilation and Air Conditioning Drawing Standard 3—General Provisions
3.1 The graphic symbols in this standard are generally drawn with thick solid lines, and the line width 6 should comply with the provisions of GB4457.4. For pipelines, pipe fittings, valves and control elements, it is allowed to draw with thin solid lines (line width is b/3). On the same drawing, the line widths of various types of graphic symbols should be kept consistent. 3.2 Text codes should be written in vertical style, with a stroke width of approximately 1/10 of the text height. 3.3 Graphic symbols are allowed to be combined with a basic symbol and other symbols, and the position of graphic symbols is allowed to be rotated. 3.4 When drawing graphic symbols, they can be appropriately enlarged or reduced in proportion according to the legend shown in this standard. 3.5 Under the premise of not violating this standard, each unit may make supplementary provisions. 4 Medium code
The medium code is shown in Table 1.
Media code
Media name
Refrigerant liquid
Refrigerant vapor
Cooling water
Refrigerant water
Makeup water
English name
Refrigerant liquid
Refrigerant vapor
Cooling water
Chilled water
Makeup water
Media code approved by the Ministry of Machinery Industry of the People's Republic of China in 199506-16
Media name
High pressure steam
Medium pressure steam
Low pressure steam
High temperature hot water
Medium temperature hot water
Low pressure hot water
Compressed air
English name
High pressure steam
Medium pressure steam.
Low pressure steam
High temperature hot water
Medium temperature hot waterLow temperature hot water
Compressed air
Vacuum (air)
Implemented on 1996-07-01
5 Graphic symbols
5.1 Pipeline
The graphic symbols of pipeline are shown in Table 2.
5.2 Pipe joints
Pipeline purpose
Compressor (fan, pump) exhaust
Compressor (fan, pump) suction
Water supply (gas, steam) pipe
Water return (gas, steam) pipe
The graphic symbols of pipe joints are shown in Table 4.
JB/T7965—95
Main pipeline
Auxiliary pipeline
Original pipeline
Pipeline connection
Pipeline crossing
Pipeline flow direction
Laminate
Quick connector
The line width is 6. X represents the code of the medium in the pipeline (see Table 1), Y represents the purpose of the pipeline (see Table 3), the following same line width is 6/2
line width is 6/3
the diameter of the point is 3 to 5 times the line width
the straight line segment represents the pipeline above, and the discontinuous line segment represents the pipeline covered below
purpose code
XATill
This symbol can also be used as a general pipe joint symbol. ")" should be consistent with the direction of the bell mouth
5.3 Pipeline elbows and tees
The graphic symbols of pipeline elbows and tees are shown in Table 5. Number
5.4 Valves
The graphic symbols of valves are shown in Table 6.
JB/T7965—95
General elbow
Outward turn upward
Bend elbow
Inward turn downward
Bend elbow
Tee A
Tee B
Tee C
T-type tee
Large radius elbow, indicate the bending radius
Non-right angle elbow, draw according to the actual angle
Reducing elbow, mark the nominal diameter of inlet and outlet
The flow direction of the medium is perpendicular to the paper
Tee (upper outlet)
The flow direction of the medium is perpendicular to the paper
Tee (lower outlet)
Indicates that C turns into the drawing at a right angle and connects to pipe D
JB/T7965--95
Stop valve
Plug valve
Pressure reducing valve
Check valve
Diaphragm valve
Regulating valve
Needle valve
Safety valve
(Closed type)
Safety valve
(Open type)
Can also be used as a general valve symbol
Three-way valve
Four-way valve
When actually drawing, it is not necessary to draw the arrow in the figure
5.5 Control elements and measuring meters
JB/T 7965-95
Continued Table 6
Float valve
Four-way change
Expansion valve
Capillary
Graphic symbols for control elements and measuring instruments are shown in Table 7. No.
A or?
A or?
General actuator
Diaphragm actuator
Pneumatic actuator
Hydraulic actuator
Electric actuator
Electromagnetic actuator
Internally balanced expansion valve
Externally balanced expansion valve
Head length-to-width ratio is 2:1
5.6 Pipeline accessories
Graphic symbols for pipeline accessories are shown in Table 8.
JB/T 7965-95
Continued Table 7
Actuator driven by pilot valve
Pressure controller
High and low pressure controller
Oil pressure differential controller
Pressure gaugewww.bzxz.net
Thermometer
Positive reducer
Side reducer
Pipeline bushing
≥ 1 : 10
Pneumatic electronic valve
Electric gas valve
Slope pipe is drawn according to the slope
symbol in GB4458.4
5.7 Power machinery
Graphic symbols of power machinery are shown in Table 9
JB/T7965—95
Continued Table 8
Ball joint
Elastic pipe
Single pipe support
Multi-pipe pipe support
Fine filter
Coarse filter
Dryer
Filter dryer
Muffler
Oil separator
Telescopic pipe
JB/T.7965—95
Compressor
Live Plug compressor
Single machine two-stage
Piston compressor
Centrifugal compressor
Rotary compressor
Screw compressor
With economizer
Screw compressor
Vacuum pump
Centrifugal fan
Centrifugal pump
Axial fan
Electric motor
Steam turbine
Internal combustion engine
This is the general compressor symbol
When drawing the actual drawing, the arrow flow direction can be omitted (the same below) The aspect ratio is 1:2
The aspect ratio is 1:2
This is the general fan (pump, vacuum pump) symbol 5.8 Auxiliary equipment
The graphic symbols of auxiliary equipment are shown in Table 10.
5.9 Refrigeration unit
Refrigeration unit graphic symbols are shown in Table 11.
JB/T 7965-95
Square container
According to the specific shape of the container, one of the three symbols should be selected.
Open container, do not draw the upper cover line. If there is a special purpose, you can add text description
Natural convection fin heat exchanger, do not draw the middle arrow (including wire tube heat exchanger)!
Coil heat exchanger
Spray heat exchanger
Shell and tube heat exchanger
Cooling tower
Air-cooled coil heat exchanger, no need to draw the outer shell 117
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.