JB/T 308-1975 Valve model compilation method

JB/T 308-1975 Valve Model Compilation Method JB/T308-1975 Standard Download Decompression Password: www.bzxz.net

Ministry of Machinery Industry of the People's Republic of China
Ministry Standards
Valve model compilation method
JB 308-75
replaces JB308--62
This standard applies Closure valves, stop valves, throttle valves, ball valves, butterfly valves, diaphragm condensers, plug valves, check valves, safety valves, pressure reducing valves and traps for industrial pipelines. 1. The model compilation method of the valve is as follows:
Valve body material code
Nominal pressure value
Valve seat sealing surface or lining material code
Structural form code
Connection form code
Transmission mode code
Type code
2. The type code is represented by Chinese Pinpu letters, as specified in Table 1. Table 1
Section
Butterfly
Separation
Positive
membrane
valve|| tt||generation
number||tt| |Class
Positive return valve and bottom valve
Safety
Minus| |tt||vegetable
pressure
A||tt ||Y
Note: For valves with low temperature (below 40℃), thermal insulation (with heating jacket) and bellows, add "" before the type code respectively. B" and "W Chinese Pinyin Zaimu.
Released by the First Ministry of Machinery Industry of the People's Republic of China
Hefei General Machinery Research Institute
Proposed|| tt||February 1976 Blind Day
Implementation
Drafted by Hefei General Machinery Research Institute and others
Page 2 of Yan 6
JB308—75||tt| |3. The transmission mode code is expressed in Arabic numerals, as specified in Table 2.
Transmission
square
electric
magnetic
dynamic
electromagnetic-hydraulic
Electro-hydraulic
generation
1||tt ||2
Transmission
Liquid
Motion
square
moving
moving
gas-liquid
moving
electric
action
generation
Table 2| |tt||No.
Note: ① This code number is omitted for handwheel, handle and wrench transmission, safety valve, pressure reducing valve and water valve. ② For pneumatic or hydraulic: normally open type is represented by 6K7K, normally closed type is represented by 6B7E: pneumatic with manual is represented by 65. Explosion-proof electric ones are represented by “98”. 4. The connection form code is represented by Arabic numerals and follows the provisions of Table 3.
Connection
Inside
Outside
Method
Connection
Shape|| tt||snail
formula
pattern
pattern
connection
generation||tt| |Note: Welding includes butt welding and socket welding.
Connect
Card|| tt||card
pickup
monkey
The structural shape code is represented by Arasun mathematics, as specified in Tables 4 to 13.
change
knot|| tt||line
formula
structure
formula
piece||tt| |Form
Elastic
Single
Wen Shuo
Double
Single
Double
Single
Double
Explanation
Plate| |tt||Board
Generation
Generation
7||tt ||8
Table 4
Floating
JB308-75||tt| |Structure form of stop valve and throttle valve
straight
straight
balance
moving
Butterfly
VerticalwwW.bzxz.Net
Branch
Partition
Membrane
Cut| |tt||Gate
Through
Straight
Knot||tt ||L
structure
straight
Ridge
structure
straight
straight| |tt||Form
Construction
Formula
Formula
Formula
Formula
Formula
Formula||tt ||Formula
Formula
Formula
Formula
Formula
Formula
Formula
Formula
Formula
Generation| |tt||generation
generation
generation
3||tt ||t
Page 3 of 6
Table 5
Table 6
Table 7
Table 8
Page 4 of 6
Fill in| |tt||Oil
Material
Forward
Spin||tt ||Spring
sealed
JB 308--75
structure
straight
four||tt ||straight
shaped
shaped
shaped
Style
Style
Style
Style| |tt||Type
Bottom valve structure form
Vertical
Single
Multiple
Double
valve
closed
unclosed
structure
structure
with heat dissipation Tablet
With wrench
pedicle control mechanism
style||tt ||Full
Double spring micro-open
open | |tt | tt||Yes
Note: For lever-type safety valves, add the Chinese Pinyin letter "G" before the type code. Decompression
elastic
membrane
spring
pattern
structure
membrane|| tt||Tube
Formula
Formula
Formula
Formula
Formula
Generation||tt| |generation
generation
generation
5|| tt||6
8||tt| |5
Table 9
Table 10
Table 11||tt ||No.
Table 12
Hydrophobic
Floating
Hot||tt| |valve
moving
floating
structure
JB 308—75
Formula
generation
Page 5 of 6|| tt||Table 13
6. The valve seat sealing surface or lining material code is represented by Chinese phonetic letters, as specified in Table 14.
Table 14
Valve seat sealing surface or lining material
Copper
Rubber
Combined
Glue| |tt||Nylon plastic
Plastic
Fluorine
Tin-based bearing alloy (Babbitt)
Steel
Generation
No.|| tt||valve seat sealing surface or lining material
repair
lining
lining
port||tt| |nitrogen
quality
combination
porcelain
Generation
P|| tt | means (except diaphragm valve). 7.The nominal pressure value is in accordance with the provisions of JB74-59 "Nominal Pressure, Test Pressure and Working Pressure of Pipeline Accessories". For valves used in the power station industry, when the maximum temperature of the medium exceeds 530°C, the working pressure shall be marked according to the provisions of Article 5 of JB74-59.
8. The valve body material code is represented by Chinese pinyin letters, as specified in Table 15. Table 15
Valve body
Material
HT25-47
KT30-6
QT4015
ZG25| |tt||Material
Generation
No.||tt ||Body
Material
Material
1Cr18NigTi
Cr18Ni12Mo2Ti
12Cr1Moy
Generation
Note: Pg≤16kgf/cm2 gray cast iron valve body and Pg25kgf/cm2 carbon steel For valve body, this code number is omitted. 5
Page 6 of 6
JB 308—75
9. The valve name is named according to: transmission mode, connection form, structural form, lining material and type. For the connection form of "flange":
Structural form: "rising stem", "elastic", "example" and "single gate" for gate valves, "straight-through" for globe valves and throttle valves , the "floating" and "straight-through type" of the ball valve, the "vertical plate type" of the butterfly valve
the "ridge type" of the diaphragm valve, the "packing" and "straight-through type" of the
cock The "straight-through" and "single-disc" valves, and the "unclosed
" valve seat sealing surface material" of the safety valve are all omitted in the naming. Examples of model and name compilation methods:
(1) Motor transmission, flange connection, rising stem wedge double gate, valve seat sealing surface material directly processed by the valve body, nominal pressure Pg1kgf/cm2, valve body material Gate valve made of gray cast iron: Z942W-1 electric changeable double gate valve
(2) Manual, external thread connection, floating straight-through type, valve seat sealing surface material is fluoroplastic, nominal pressure P. 40kgf/cm2 ball valve with body material of 1Cr18Ni9Ti: Q21F-40P external thread ball valve
(3) Pneumatic normally open type, flange connection, roof type, lining material is rubber lining, nominal pressure P. 6kgf/cm. Diaphragm valve with gray cast iron body material: G6&41J-6 pneumatic normally open rubber-lined diaphragm valve (4) hydraulic, flange connection, vertical plate type, valve seat sealing surface material is cast copper, valve disc sealing surface material is rubber , nominal pressure Pg2.5kgf/cm, butterfly valve with gray cast iron body material: D741X-2.5 hydraulic butterfly valve
(5) Motor transmission, welding connection, straight-through type, valve seat cover material is hard surfacing Alloy, working pressure P54170, valve body material chromium molybdenum vanadium steel stop valve: J961Y-P54170 electric welded stop valve
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