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You are here: Shanghai Nengen Valve Co., Ltd. -Valve Selection

Analysis of valve selection unit:
According to the needs of the piping system design and the characteristics of various types of valves, installation and use, and other factors determine which valve to use.
1
2
3
4
5
6
7
1.Type code
2.Drive code
3 , connection form code
4. Structure code
5.Code of sealing surface material or lining material
6.Working pressure under pressure code or working temperature
7. Valve body material code

1 unit = valve type code:
Valve type
Code
Valve type
Code
Safety valve
A
Ball valve
Q
Butterfly valve
D
Steam trap
S
Diaphragm valve
G
Control valve
T
Check valve
H
Plunger valve
U
Shut-off valve
J
Stopcock
X
Throttle
L
Pressure reducing valve
Y
Drain valve
P
gate
Z

2 units = drive mode code:
Select the valve transmission mode according to the valve parameters, functions, operating requirements and site conditions. Our company can provide users with manual, electric, pneumatic, hydraulic, electromagnetic, automatic and other types of valves, and can also be selected according to user requirements. Drive mode code:
Driving method
Code
Driving method
Code
electromagnetic
0
Bevel gear
5
Electromagnetic-hydraulic
1
pneumatic
6
Electric-hydraulic
2
Hydraulic
7
turbine
3
Gas-hydraulic
8
Spur gear
4
electric
9
Note: ①, Code 1 , Code 2 and Code 8 are used when the valve is opened and closed, two power sources are required to operate the valve at the same time. ② The safety valve, hydraulic valve, water delivery valve, and manual handwheel are directly connected to the valve stem operating structure. This code is omitted and is not shown. ③ For pneumatic or hydraulic: normally open type is represented by 6K , 7K ; normally closed type is represented by 6B , 7B ; pneumatic belt manual is represented by 6S , explosion-proof electric is represented by 9B

Unit 3 = Connection method code:
Different connection methods are selected according to the operating conditions and installation requirements of the valve. Generally, there are screw connection, flange connection, butt welding connection, butt connection, etc. Connection form code:
Connection Type
Code
Connection Type
Code
internal thread
1
Butt welding
6b
External thread
2
Pair
7
Flange
4
Clamp
8
Socket welding
6s
card cover
9
Structure length: The user has no special requirements and is manufactured in accordance with the design standards ( GB , API , ANSI , BS, etc.) implemented by the valve. Refer to the parameter " Product connection size" provided by our company

4 units = code of structure form (including summary of the first 3 units):
Method of valve model:
The valve model is composed of 7 units, and its content is shown in the figure: the nominal pressure number is represented by Arabic numerals, and its value is 10 times the nominal pressure value in megapascals ( MPa ). When the maximum temperature of the medium exceeds 530 ℃, its value is 10 times the working pressure value in megapascals ( MPa ). With reference to the JB4018-85 standard, the model compilation method is as follows:
Code
0
1
2
3
4
5
6
7
8
9
transfer method
Electromagnetic
Electromagnetic fluid
Electro-hydraulic
Worm gear
Spur gear
Bevel gear
pneumatic
Hydraulic
Gas - hydraulic
electric
Connection Type
internal thread
External thread
Flange
welding
Pair
Card
card cover
Type code
structure type
gate
Z
Bright pole
Hidden rod
Wedge
Parallel
Wedge
Parallel
Spring gate
rigidity
Single brake
Double brake
Single brake
Double brake
Single brake
Double brake
Single brake
Double brake
Shut-off valve
J
Straight-through
Ternary
Right angle
DC type
balance
Throttle
L
Straight-through
Right angle
Ball valve
Q
Floating ball
fixed
ball
Straight-through
Y -type three-way
Quaternary
Straight-through
Butterfly valve
D
Leveraged
Vertical plate
Inclined plate
Diaphragm valve
G
Ridge style
Cut-off
DC plate type
Straight-through
Gate type
Angle Y
Angle T
Stopcock
X
Packing
Quaternary
L straight-through
T -shaped three-way
Thru
Check valve
H
Lifting
Swing type
Butterfly
Straight-through
Vertical
Single flap
Multi-lobed
Double flap
Safety valve
A
spring
Pulsed
Closed
Not closed
Closed
Not closed
Fully open with heat sink
Slightly open
Full open
With wrench
Leveraged
With control mechanism
With wrench
Double spring micro-opening
Full open
Quan Qi Shi
Slightly open
Full open
Pressure reducing valve
Y
Thin touch
Thin spring type
Piston
Bellows
Leveraged
Steam trap
S
Float
Bell float
Bimetal sheet
Pulsed
Disc

Unit 5: Sealing surface or lining material code:
Sealing surface or lining material
Code
Sealing surface or lining material
Code
Tin-based bearing alloy (Babbitt alloy)
B
Nylon plastic
N
enamel
C
Boronizing steel
P
Nitriding steel
D
Lead lining
Q
Fluoroplastic
F
Austenitic stainless steel
R
ceramics
G
plastic
S
Cr13 series stainless steel
H
Copper alloy
T
Rubber lining
J
rubber
X
Monel
M
Cemented carbide
Y
Note: ① Except for the diaphragm valve, when the material of the sealing surface of the sealing pair is different, it is expressed by a hard density material. ② When the valve sealing auxiliary material is the valve body material, the material code of the valve seat sealing surface is indicated by "W" .

Unit 6 = pressure code or working pressure code at working temperature:
The working pressure at the specified temperature of the valve is a round integer value for reference. It is divided into different levels and expressed by PN . According to GB / T1048-1990 , the national standard valve unit is MPa, and the pound valve is expressed by LB. The following nominal pressure PN values are based on the GB / T 1048-2004 standard. PN : Identification of the combination of letters and numbers used for reference in relation to the mechanical and dimensional characteristics of piping system components. It consists of the letters PN and followed by a dimensionless number
The PN value should be selected from the following series:
DIN series
ANSI series
PN2.5
PN20
PN6
PN50
PN10
PN110
PN16
PN150
PN25
PN260
PN40
PN420
PN63
PN100
Note: When necessary, other nominal PN values (PN)

7 unit = valve body material code:
Body material
Code
Body material
Code
Carbon steel
C
Ductile iron
Q
Cr13 series stainless steel
H
0Cr17Ni12Mo2 series stainless steel
R
1Cr5Mo chrome molybdenum steel
I
0Cr17Ni14Mo2 series stainless steel
RL
15CrMo chromium molybdenum steel
H
plastic
S
Malleable cast iron
K
Copper and copper alloys
T
Aluminum alloy
L
Titanium and titanium alloys
Ti
0Cr18Ni9 series stainless steel
P
Chrome molybdenum vanadium steel
V
0Cr19Ni10 series stainless steel
PL
grey cast iron
Z

Common valve body material codes :
Code
I
C
P
R
V
Body material
Cr5Mo
C5
WCB
25
A105
1Cr18Ni9Ti
ZG1Cr8Ni9Ti
CF8 (304)
CF3 (304L)
1Cr18Ni12Mo2Ti
ZG1Cr8Ni12Mo
2Ti
CF8M (316)
CF3M (316L)
12Cr1MoV
ZG15CrMo1V
ZG20CrMoV
WC6
WC9
Note: The user should order according to the product model of the firm. If there are special requirements, please specify in the order contract.

Valve material properties:
Note * : Mainly compiled and manufactured according to JB / T 5300-1991 standard!
Body material
Applicable nominal pressure / MPa
Applicable temperature /
Applicable medium
grey cast iron
≤10
-10 to 200
Water, steam, air, gas and oil
Malleable cast iron
≤25
30300
Water, steam, air and oil
Ductile iron
≤40
30350
Water, steam, air and oil
Copper alloy
≤25
40250
Water, seawater, oxygen, air and oil
Carbon steel
≤320
30450
Water, steam, air, hydrogen, ammonia, nitrogen and petroleum products
High temperature steel
≤16
≤550
Steam and petroleum products
Low temperature steel
≤64
- 196
Ethylene, propylene, liquid natural gas and liquid nitrogen
Stainless acid-resistant steel
≤64
≤200
Nitric acid, acetic acid and other media

In addition to the above selection units, the nominal diameter is also required :
DN : The dimensional identification of a combination of letters and numbers for piping system components. It consists of the letter DN followed by a dimensionless integer number. This number is directly related to the characteristic dimensions such as the hole diameter or outer diameter (unit: mm ) of the end connector. The preferred DN values are as follows:
1. Pipe size inches and millimeters comparison table:
Fitting size inch mm comparison table
Diameter inch
1/4 ″
3/8 ″
1/2 ″
3/4 ″
1"
1.2 ″
1.5 ″
2"
2.5 ″
Diameter mm
DN8
DN10
DN15
DN20
DN25
DN32
DN40
DN50
DN65
Outer diameter mm
13.7
17.14
21.3
26.7
33.4
42.2
48.3
60.3
73
Diameter inch
3 ″
4 ″
5 ″
6 ″
8"
10 ″
12 ″
14 ″
16 ″
Diameter mm
DN80
DN100
DN125
DN150
DN200
DN250
DN300
DN350
DN400
Outer diameter mm
88.9
114.3
141.3
168.3
219.1
273
323.8
355.6
406.4
Note: 1 inch = 25.4mm = 8 inches 1 minute = 1/8 ″ 2 minutes = 1/4 ″ 3 minutes = 3/8 ″ 4 minutes = 1/2 ″ 6 minutes = 3/4 ″ 8 minutes = 1 "

2. For a detailed comparison of the valve diameter (connection) of the water pipe, see the following table:
Pipe diameter DN (nominal diameter) corresponds to pipe outer diameter Ф (mm):
Nominal diameter
DN15
DN20
DN25
DN32
DN40
DN50
DN65
DN80
DN100
DN125
Small diameter series
Ф18
Ф25
Ф32
Ф38
Ф45
Ф57
Ф73
Ф89
Ф108
Ф133
Large diameter series
Ф22
Ф27
Ф34
Ф42
Ф48
Ф60
Ф76
Ф89
Ф114
Ф140
Nominal diameter
DN150
DN200
DN250
DN300
DN350
DN400
DN450
N500
DN600
Small diameter series
Ф159
Ф219
Ф273
Ф324
Ф360
Ф406
Ф457
Ф508
Ф610
Large diameter series
Ф168
Ф219
Ф273
Ф325
Ф377
Ф426
Ф480
Ф530
Ф630
Nominal diameter
DN700
DN800
DN900
DN1000
DN1200
DN1400
DN1600
N1800
DN2000
Diameter series
Ф720
Ф820
Ф920
Ф1020
Ф1220
Ф1420
Ф1620
Ф1820
Ф2020

3. For the large water pipe (large outer diameter), the valve diameter (interface) should be compared in detail, see the following table:
Pipe diameter DN (nominal diameter) corresponds to pipe outer diameter Ф (mm)
pressure
Matching tube outer diameter
Nominal pressure
Matching tube outer diameter
Large outer diameter series
Small outer diameter series
Large outer diameter series
Small outer diameter series
DN15
Φ22
Φ18
DN125
Φ140
Φ133
DN20
Φ27
Φ25
DN150
Φ168
Φ159
DN25
Φ34
Φ32
DN200
Φ219
Φ219
DN32
Φ42
Φ38
DN250
Φ273
Φ273
DN40
Φ48
Φ45
DN300
Φ324
Φ325
DN50
Φ60
Φ57
DN350
Φ356
Φ377
DN65
Φ76
Φ73
DN400
Φ406
Φ426
DN80
Φ89
Φ89
DN450
Φ457
Φ480
DN100
Φ114
Φ108
DN500
Φ508
Φ530
Select according to the provisions of GB / T1047 , expressed in DN , the unit is mm , pound-scale valve is expressed in NPS , the unit is (in) .

Codes for valves with other functions:
Second function role name
Code
Second function role name
Code
Low temperature type
D
Slow-closing type
H
Thermal insulation
B
Deslagging type
P
Bellows
W
Purge type
C
Telescopic flange type
S
Fireproof
F
V -shaped
V
Fast
Q
Corner code with special structure valve:
Specific Structure Name
Code
Specific Structure Name
Code
Knife flat gate valve
D
Water seal
S
Gate valve with diversion hole
K
Gate valve without diversion hole
W

Example of model and name compilation method:

( 1 ) Ball valve, electric, flange connection, floating straight through, PTFE soft seal, 16 kg pressure, stainless steel 304 valve body

Model: Q941F-16P
( 2 ) Butterfly valve, pneumatic, wafer connection, vertical plate type, soft rubber seal, 16 kg pressure, ductile iron valve body
Model: D671X-10Q
( 3 ) Check valve, flange connection, vertical lift type, alloy steel hard seal, 40 kg pressure, carbon steel valve body
Model: H42H-40C
( 4 ) Ball valve, turbine drive, flange connection, fixed straight-through, hard alloy steel seal, 100 kg pressure, carbon steel valve body
Model: Q347H-100C
( 5 ) Globe valve, pneumatic, flange connection, straight-through, alloy steel seal, 64 kg pressure, stainless steel 316 material
Model: J641H-64R

Ordering instructions:
① For users who meet the specifications of this sample, the valve users can choose according to the models listed in this sample. If there are special requirements (such as specifications, materials, transmissions, connection dimensions, structural forms, etc.), additional details should be specified.
② The electric control box of the electric valve, the servo amplifier of the automatic control valve, the operation box, and the electromagnetic directional valve on the pneumatic valve are all customized by the customer. It can also be provided by our company, but the price is extra.   For valves used in the construction, municipal, water supply and drainage industries, please refer to our company's catalogue A.

 

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