This standard specifies the graphic symbols for steam turbines. This standard is applicable to the drawing of steam turbine system schematics, including thermal system diagrams, drain system diagrams, flange bolt heating system diagrams, regulating and safety lubricating oil system diagrams (the above items are hereinafter referred to as steam turbine steam, water, and oil systems), measurement point layout diagrams, and electro-hydraulic regulation electrical system diagrams. Graphic symbols not specified in this standard can be derived according to the graphic symbol rules listed in this standard or by citing other standards. JB/T 3077-1991 Graphic symbols for steam turbines JB/T3077-1991 Standard download decompression password: www.bzxz.net

Mechanical Industry Standard of the People's Republic of China
JB/T3077
Li Jia Dian
1991-07-01
Zhang Xian Ji
1992-07-01Xiao Huang
Ji Jia Xin Kui Lu Wa Yi Xian
This standard specifies the graphic symbols for steam turbines. JB/T3077
JB30771982
This standard is applicable to drawing steam turbine system schematics, including thermal system diagrams, drain system diagrams, flange bolt heating system diagrams, regulating and protecting lubricating oil system diagrams (the above items are hereinafter referred to as steam turbine steam, water, and oil systems), measuring point layout diagrams, electro-hydraulic regulation electrical system diagrams, etc. Graphic symbols not specified in this standard can be derived according to the graphic symbol rules listed in this standard or by citing other standards. 2 Reference standards
GR 786
GB 2625
Graphic symbols for pressure waves and pneumatics
Graphic symbols for process control and flow diagramsLiterary code GR 4457.4
Mechanical drawing graphics
GB 4728
JB1396
JB1397
SJ1223
Graphic symbols for electrical diagrams
Drawing method for layout of instrument panel in industrial automationDrawing method for wiring connection diagram of instrument panel only in industrial automationGraphic symbols for binary logic circuits
Graphic special number 3 for steam, water and oil systems of steam turbines
3.1 Pipelines
The line width standard of graphic symbols shall be in accordance with GB4457.4. The line width at the end of the description shall be a thin solid line. The graphic symbols for warning circuits are shown in Table 1. Table 1
New steam pipe station
Before and after reheating
Not adjusting the extraction pipe
Adjusting the extraction pipe
Back pressure steam pipe station
Condensate pipe
1991-07-01
Graphic number
Line width 2b
Line width ~ 2b
(1)Line width = 2b
(2)Digital cousin pushes the series, When the first stage does not adjust the steam extraction, the word "teaching" is still marked\1\
1) Line width ~2b Arrow inclination 60% Sliding pipeline line uniform distribution (2) Causes the word "teaching" to show the steam extraction stage. Only when the first stage adjusts the steam extraction, the word "teaching" is still marked*1
Line width 2b
1992-07-01Small cable
Steam seal steam pipeline
Air pipeline
Fumigate steam. Air and water
Mixing pipe
Water supply pipe|| tt||Condensate pipeline
Cooling water pipeline
Drain pipeline
Chemical supply water pipeline
Main oil system imported oil
Pressure oil pipeline
Pulse oil pipeline
Lubricating pumping pipe
Oil pipeline
Security oil pipeline station
JB/T3077
Continued table 1
Time
—XX-X-||tt| |(Primary)
Line width b
Line width b
Line width αn
(Secondary)
Pulse signal is evenly distributed along the pipeline line
tnSecondary)
Line width = b
Note: In the single system diagram, if it is not necessary to subdivide, in order to make the reading clear, the steam pipeline can be represented by a thick solid line with a width of 2b, the pressure oil can be represented by a thick solid line, and the water pipeline can be represented by a thin solid line. 3. 2
Pipeline connection
Pipeline connection See Table 2.
Alternate
Branch pipeline
Graphic symbol
Transfer pipeline
Flange connection
Reducing joint
Exhaust to air
Discharge into ground structure
Discharge into manhole
Corrugated compressor
Arc compressor
Oil drain port
JB/T30771991
Continued Table 2
Graphic symbol
JB/T30771991
Previous; Clothes 2~Table 6 A unified symbol should be used on the same sample. 3.3 Drive and control mode
Drive and control mode [Character symbol] See Table 3. Table 3
Electric type
Electric type
Hydraulic type
Heavy type
Spring type
High-center type
Diaphragm type
Graphic symbol
When it is necessary to specify whether the current is DC or AC, it is represented by E
Float type
3.4 ​​Valves
The graphic symbols of valves are shown in Table 4.
Stop valve
Plug valve
Three-way plug
JB/T3077
Continued Table 3
Graphic symbols
Flower shape code
When there is no need to distinguish the types, this figure can be used as a general reference
Lifting check valve
Angle check valve
Condensing check valve
Ball check valve
Spring-loaded check valve
Channel safety valve
Heavy hammer safety valve
Regulating culvert
JB/T30 77
Graphic symbols
The flow direction is represented by a blank triangle and a non-blank triangle, and the "side" indicates the medium inlet side
Needle regulating valve
Condensation pressure valve
Water jet valve
Three-way valve
Water valve
Water seal valve
JB/T30771991
Continued Table 4
Graphic number
One end of the small triangle is the high-pressure end
Figure A single stage
Figure B multiple stage
Note: The number of the valve in the figure is the basic symbol of the valve, which is also the manual symbol. For various types of doors, generally only the graphic symbols of the manual type are given. According to the requirements, a thin solid line can be drawn from the symmetric center of the manual type shown in the figure to connect 3.3 to add a drive and control mechanism. The blood method can be followed according to Item 13.14 of the loss, 3.5 main and auxiliary machines, the graphic symbols of auxiliary machines are shown in Table 5. Single-cylinder steam turbine. Rain-shaped symbol. Single-cylinder double steam turbine. Centrifugal system. Steam-driven centrifugal pump. Electric centrifugal pump. Gear pump. Rocking piston pumpbzxZ.net
Plunger summer
Vane pump
Screw pump
JB/T30771991
Continued table 5
Field shape number
When DC motor or AC motor needs to be specified: it is expressed as or @
Compressor
Turbine shaft seal
Light sliding shaft water
Thrust sliding bearing
Light thrust sliding shaft water
Gear speed changer
Sex coupling||t t||Gear coupling
Semi-interference coupling
JB/T3077
Continued table 5
Graphic symbols
AC generator
Face-mounted steam tank
Mixed bamboo condenser
Deep mouth net
Ball charging room
Ball collecting net
Secondary filter
JB/T3077
Continued table 5
Shape
Figure A Circle Simplified
B Square Box type
Figure A fixed type
Figure movable type
Quick protection water supply pump
Point empty pump
Describer
Main jet steam exhauster
Ejector
Surface mounted heat converter
Mixed induction converter
JB/T3077
Continued table 5
Graphic symbol
Medical A steam-driven type
Figure B electric type
External quality, can be expressed as water jet exhauster or oil remover 11
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