Valve type and valve code

Valve type and valve code

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Type and Code of valves

In order to certify, classify and distinguish the various components and their functions, industrial valves are divided into the following groups and subgroups. 

Valve Models

Industrial valves date back to the invention period of steam engines but in recent decades, due to oil, chemical, electrical, metallurgical, nautical, nuclear and aerospace requirements, higher quality and safety requirements have been imposed.
The most important parameters of the valve are: its working temperature (ultra-low -269 ℃ and high from 1200 ℃ up to 3430 ℃), the operating pressure (from ultra-vacuum 1.33 × 10-8Pa up to ultra-high 1460MPa) and the dimensions of the diameter (from 1 mm to 6000 mm, even reaching 9750 mm). The valve materials, on the other hand, are the result of the fusion of steel, carbon alloys and titanium. Many steel valves are even resistant to corrosion, low temperatures and sources of great heat.
The way the valve is operated varies according to its use in the electrical, pneumatic or hydraulic industry, also taking into account program control, digital air, remote control and all other work elements. The valve processing technology also varies according to the assembly lines, whether these are automatic or
Valve type and valve code


1. Classification of the functions and use of valves

(1) Globe valve

The Globe valve is also called a closed-circuit valve. Its function is to connect or cut off the medium in the pipeline. Globe valves include gate valves, plug valves, ball valves, butterfly valves and diaphragms.

(2) Check valve

The check valve is also called a one-way valve. Its function is to prevent the backflow of the medium in the pipeline. The bottom valve of the water pump also belongs to the check valve category.

(3) Safety valve

The function of the safety valve is to prevent the medium pressure in the pipeline. It helps from exceeding the specified value to achieve the purpose of safety protection.

(4)Regulating valve

Regulating valves include throttle valve and pressure reducing valve. Its function is to adjust the pressure, flow and other parameters of the medium.

(5) Diverter valve

Diverter valves include various distribution valves and traps. Its function is to distribute, separate or mix the medium in the pipeline.
Valve type and valve code


2. Classification by rated pressure of valves

• Vacuum
The operating pressure is lower than the standard atmospheric pressure.
• Low pressure
The nominal pressure is PN ≤1.6Mpa.
• Medium pressure
The nominal pressure is PN = 2.5, 4.0, 6.4Mpa.
• High pressure
The PN pressure is 10 ~ 80Mpa.
• Very high pressure
They reach pressures of PN ≥100Mpa.
Valve type and valve code


3. Vavole and operating temperature

• Very low
They are used for medium operating temperatures t <-100 ℃.
• Low
Used with average operating temperatures of -100 ℃ ≤t≤-40 ℃.
Withstand average operating temperatures of -40 ℃ ≤t≤120 ℃.
• Medium
Used for average operating temperatures 120 ℃
• High
They can be used with average operating temperatures t> 450 ℃.
Valve type and valve code


4. Classification of valves according to the driving method

• Automatic

Refers to a valve that does not require external force to operate. It relies on the energy of the
medium itself to make the valve act. includes safety valve, pressure reducer, steam trap, check
valve, automatic adjustment valve, etc.
• Motorized
The motorized valve can be operated from various power sources.
• Electric
This is a valve that works thanks to electricity.
• PneumaticsIt is a valve operated by compressed air.
• Hydraulics
It starts working thanks to hydraulic pressure like oil.
• Mix
In addition, there are different combinations of the above driving methods, such as a gas-electric

valve and so on. 

Manual valve

The manual valve uses handwheel, handle, lever and pinion to control the action of the valve by manpower.
As the valve opens and closes, the torque increases and the worm gear or worm gearbox can be placed
between the handwheel and the valve stem. The universal joint and drive shaft can also be used for remote
In industrial and civil engineering there are 11 main categories of valves:
3. plug-in valve
5. throttle
6. diaphragmatic valve
8. throttle
9. safety valve
10. pressure reducing valve
11. condensate drain
• Other specialty valves (include valves for instruments, hydraulic control piping systems, and for
various machine bodies and chemical equipment).
Valve type and valve code


5. Taxonomy based on the nominal diameter of the valve

• Small diameter:
This is a valve with a nominal diameter DN≤40mm.
• Medium diameter:
The nominal diameter is DN 50 to 300 mm.
• Large diameter:
The nominal diameter varies in the DN range from 350 to 1200 mm.
• Extra large diameter:
The nominal diameter reaches DN ≥ 1400 mm.
Valve type and valve code

6. Organization of the structural characteristics of the valves

• Globe shape
The opening and closing valve parts are driven by the valve stem and this helps in moving up and
down the centerline of the valve seat.
• Plug shape
The opening and closing member is driven by the valve stem in order to helps in moving up and
down the center line perpendicular to the valve seat.
• Plug valve
Opening and closing parts rotate around its own centerline.
• Swing valve
The opening and closing valve rotates around the axis outside the seat.• Butterfly travel
The opening and closing disc rotates around the fixed axis in the valve seat.
Slide valve row

The opening and closing parts slide in the direction perpendicular to the channel.

7. Methods of connecting the valves

• Threaded connection
The valve body has internal or external thread and is connected with the pipe thread.
• Flanged connection
The valve body has a flange which is connected to the pipe.
• Solder connection
The valve body has a weld groove and is welded to the pipeline.
• Clamp connection
The valve body has a locking port and is connected with the hose clamp.
• Ring nut connection
Use the bezel to connect with the pipeline.
• Wafer connection

It is a form of connection where the valve and the two pipes are directly fastened together with bolts.

8. Variety of valve body materials

• Metal valve
The body of these valves, and other parts of them, are made of metallic material.
The most commonly used metal materials are:
჻ Cast iron
჻ Carbon steel
჻ Steel alloy
჻ Copper alloy
჻ Aluminium alloy
჻ Lead alloy
჻ Titanium alloy

჻ Monel league

• Non-metallic material valve
The body of these valves, and other parts of them, are made of non-metallic material.
The most used non-metallic materials are:
჻ Plastic
჻ Ceramic
჻ Coated

჻ Glass fiber reinforced plastic

• Valve lined with metal body

The valve body is made of metal and its main surfaces are in contact with the fluid.
The most used materials to coat these valves are:
჻ Eraser
჻ Plastic
჻ Ceramic

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The valves we produce meet various international testing indicators, and all kinds of valves are manufactured and accepted according to relevant domestic standards such as GB and JB, as well as international standards such as ANSI, API, JIS, and BS. DIN. Please contact us for special production standards.​

We are not only a manufacturer of valves, but also a disseminator of industry knowledge


valve code

The standard “JB/T 308-2004 Valve Model Compilation Method” (hereinafter referred to as “this standard”) specifies the model compilation, type code, drive mode code, connection form code, structural form code, sealing surface material code, Representation of valve body material code and pressure code.

This standard is applicable to the model compilation of general-purpose gate valves, globe valves, throttle valves, butterfly valves, ball valves, diaphragm valves, plug valves, check valves, safety valves, pressure reducing valves, steam traps, blowdown valves, and plunger valves.

According to this standard, the valve model consists of seven parts: valve type, driving method, connection form, structural form, sealing surface material or lining material type, pressure code or working pressure at working temperature, and valve body material.

The order of valve model preparation is: valve type, drive mode, connection form, structural form, sealing surface material or lining material type, nominal pressure code or working pressure code at working temperature, valve body material.

1. Model preparation of the valve

The valve model consists of 7 units, the meanings of which are as follows.

(1) Type code: The type code is represented by Chinese pinyin letters, as shown in Table 1.

(2) Code of drive mode: code of drive mode, expressed in Arabic numerals according to the provisions of Table 2.

(3) Connection form code: The connection form code of the valve is expressed in Arabic numerals according to the provisions of Table 3.

(4) Structural form code: The structural form code of the valve is represented by Arabic numerals. The structure code of gate valve shall be as specified in Table 4; the structure code of globe valve, plunger valve and throttle valve shall be as specified in Table 5; the structure code of ball valve shall be specified as specified in Table 6; the structure code of butterfly valve shall be specified as specified in Table 7; Structural form code according to the provisions of Table 8; plug valve structural form code according to the provisions of Table 9; check valve structural form code according to the provisions of Table 10; safety valve structural form code according to the provisions of Table 11; pressure reducing valve structural form code According to the provisions of Table 12; the structure code of steam traps shall be in accordance with the provisions of Table 13;

Table 1 Type code of valve

valve typecodevalve typecode
spring loaded safety valveAblowdown valveP
Butterfly valveDBall valveQ
Diaphragm valveGsteam trap valveS
Lever type safety valveGAPlunger valveU
Check Valves and Foot ValvesHPlug valveX
Globe valveJpressure reducing valveY
throttle valveLgate valveZ

When the valve has other functions or has other special structures, add a Chinese pinyin letter before the valve type code, as shown in the following table

Table 1-1 Representation code of valves with other functions or with other special structures

second function namecodesecond function namecode
Insulation typeBSlag discharge typeP
cryogenic typeDfast typeQ
fireproof typeF(Stem Seal) Bellows TypeW
Slow-closing typeH

Note: The low temperature type refers to the valve whose temperature is allowed to be lower than -46℃.

Table 2 Valve’s drive mode codedrive modecodedrive modecodeElectromagnetic drive0bevel gear5Electromagnetic-Hydraulic Drive1Air driven6Electro-hydraulic drive2Hydraulic drive7worm gear3Air Hydraulic drive8spur gear4electric drive9

Note: 1. This code can be omitted for those driven by handwheel, handle and wrench, as well as safety valve, pressure reducing valve and steam trap.

2. For pneumatic or hydraulic, normally open type is represented by 6K, 7K, normally closed type is represented by 6B, 7B; pneumatic with manual, represented by 6K; explosion-proof electric, represented by 9H; worm-T-type nut, represented by 3T .

3. Code 2 and code 8 are the actuators that need to be operated by two power sources at the same time when the valve is opened and closed.

Table 3 Valve connection form code

Connection TypecodeConnection Typecode
internal thread1pair-clip7
External thread2Card-Hoop8
flange4card cover9

Note: Welding includes butt welding and socket welding.

Table 4 Structural code of gate valve

Gate valve structurecode
Stem lift-down type (rising stem)wedge-type gateelastic gate0
rigid gatesingle gate1
Double gate2
Parallel-type gatesingle gate3
Double gate4
Stem non-lifting type (dark rod)wedge-type gatesingle gate5
Double gate6
Parallel-type gatesingle gate7
Double gate8

Table 5 Structural code of globe valve, plunger valve and throttle valve

Globe valve, plunger valve and throttle valve structurecodeGlobe valve, plunger valve and throttle valve structurecode
Thru-type1DC type (Y type)5
Z-type Thru-type2Balanced Thru-Type6
Three-way-type3Balance angle type7
angle type4Needle Globe Valve8

Table 6 Ball valve structure code

Ball valve structure-formcodeBall valve structure-formcode
floating ballThru-type1Fixed ballThru-type7
Y shapeThree-way-type2four-way6
L shape4T shapeThree-way-type8
T shape5L shape9
Hemisphere – Thru0

Table 7 Butterfly valve structure code

Butterfly Valve Structural FormcodeButterfly Valve Structural Formcode
sealed typesingle eccentric0unsealed-typesingle eccentric5
Center Vertical Plate1Center Vertical Plate6
double eccentric2double eccentric7
triple eccentric3triple eccentric8
connecting rod-mechanism4connecting rod-mechanism9

Table 8 Diaphragm valve structure code

Diaphragm Valve Structural FormcodeDiaphragm Valve Structural Formcode
house ridge-type1Gate-type7
cutoff-type3Angle Y shape8
DC plate type5Angled T shape9

Table 9 Structural form code of plug valve

Plug valve structure-formcodePlug valve structure-formcode
packing-seal L shape2Oil seal sealL shape6
T shape Three-way4T-shaped tee way8
four-way5static matchThru-type9
T-shaped tee way0

Table 10 Check valve structure code

Check valve structure formcode
Raise – lowerThru-type1
angle type3
Double flap-type6
Rotary-Butterfly Check7
Globe valve-check8

Table 11 Structural form code of safety valve

Safety valve structure-formcode
springclosedwith heat sinkfull start-type0
Micro start type1
with spannerDouble spring micro-opening-type3
not closedfull start-type4
Micro start type7
full start-type8
with control mechanismfull start-type6

Table 12 Structural code of pressure reducing valve

Pressure reducing valve structure-formcode
direct acting bellows1
direct acting thin film2
Pilot Piston Type3
Pilot Bellows Type4
Pilot film type5

Table 13 Structural form code of steam trap

Steam Trap Structure Formcode
floating ball type1
Labyrinth or orifice plate type2
Floating barrel type3
Liquid or solid expansion type4
Bell float type5
Steam pressure type6
Bimetal or elastic7

Table 14 Structural code of blowdown valve

Sewage valve structure-formcode
Liquid level connectionGlobe type – straight-through type1
Globe type – angle type2
liquid bottom intermittentGlobe type – DC type5
Globe type – straight-through type6
Globe type – angle type7
Floating-gate type-straight-through type8

(5) Code of valve bottom sealing surface or lining material: The code of valve bottom sealing surface or lining material is expressed in Chinese Pinyin letters, according to the provisions of Table 15.

(6) Nominal pressure code: The nominal pressure code is represented by Arabic numerals, and its value is 10 times the nominal pressure value in megapascals (MPa). For valves used in the power station industry, when the maximum temperature of the medium exceeds 530°C, the value is 10 times the working pressure value in megapascals (MPa).

(7) Valve body material code: The valve body material code is expressed in Chinese Pinyin letters, as specified in Table 16. Cast iron valve body with PN less than or equal to 1.6Mpa and carbon steel valve body with PN greater than or equal to 2.5Mpa omit this code.

Table 15 Seat Seal or Liner Material Code

Seat sealing surface or lining materialcode
Tin-Based Bearing Alloy (Babbitt)B
Nitriding SteelD
18-8 series stainless steelE
Cr13 series stainless steelH
Monel alloyM
nylon plasticN
boronized steelP
lead linedQ
Mo2Ti series stainless steelR
copper alloyT
cemented carbideY

Note: 1. The material code of the seat sealing surface directly processed by the valve body is represented by W.

2. When the sealing surface material of the sealing pair is different, it is indicated by the material code with low hardness.

Table 16 Valve body material code

valve body materialcode
Titanium and Titanium AlloysA
carbon steelC
Cr13 series stainless steelH
Chrome-molybdenum steelI
Malleable cast ironK
Aluminum alloyL
18-8 series stainless steelP
Ductile IronQ
Mo2Ti series stainless steelR
Copper and Copper AlloysT
Chrome Molybdenum Vanadium SteelV
grey cast ironZ

Second, the naming of the valve


The name of the valve is named according to the driving mode, connection form, structural form, lining material and type, but the following contents are omitted in the naming:


(1) In the connection form: “flange”.


(2) In the structural form:


a. The gate valve’s “rising stem”, “elasticity”, “rigidity” and “single gate”.


b. “Straight-through” type of globe valve and throttle valve.


c, “floating” and “straight-through” of the ball valve.


d. The “vertical plate type” of the butterfly valve.


e. The “ridge type” of the diaphragm valve.


f. The “packing” and “straight-through” of the plug valve.


g. “Straight-through” and “single flap” of check valve.


h. “Not closed” of the safety valve.


(3) The material name in the seat sealing surface material.


3. Examples of valve model and name compilation method


1. Electric gate valve, flange connection, rising rod wedge type double gate, valve seat sealing surface material is directly processed by the valve body, the nominal pressure is PN0.1MPa, and the valve body material is gray cast iron gate valve:


Z942W-1 Electric wedge type double gate gate valve


2. Manual, external thread connection, floating straight-through type, valve seat sealing surface material is fluoroplastic, nominal pressure is PN4.0MPa, valve body material is 1Cr18Ni9Ti ball valve:


Q21F-40P male thread ball valve


3. Diaphragm valve with pneumatic normally open type, flange connection, ridge type, rubber lining material, nominal pressure PN0.6MPa, and valve body material gray cast iron:


G6K41J-6 Pneumatic normally open rubber-lined diaphragm valve


4. Butterfly valve with hydraulic, flange connection, vertical plate type, the seat sealing surface material is cast copper, the valve disc sealing surface material is rubber, the nominal pressure is PN0.25MPa, and the valve body material is gray cast iron:


D741X-2.5 Hydraulic Butterfly Valve


5. Electric, welded connection, straight-through, valve seat sealing surface material is surfacing hard alloy, working pressure at 540 ℃ is 17MPa, valve body material is chrome molybdenum vanadium steel globe valve:


J961Y-P54170V Electric Welding Globe Valve

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The power station check valve is a valve body as a die forging. The middle cavity adopts a pressure-free self-tightening structure without a bonnet. The higher the inner cavity pressure, the better the sealing performance. It is made according to the user’s requirements and is suitable for the main water supply, circulating water and steam extraction and recuperation pipelines of thermal power plants, preventing the flow of high temperature and high pressure medium, and protecting the safety of main equipment such as pumps.

QDY42F 液动紧急切断阀

QDY42F Hydraulic Emergency Shutoff Valve-Oil and Gas Industry Best

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H41F4 F46 衬氟止回阀

H41F4 F46 Fluorine Lined Check Valve-Chemical Industry Best

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