Valve type and 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

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

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

Note: Welding includes butt welding and socket welding.

Table 4 Structural code of gate valve

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

Table 6 Ball valve structure code

Table 7 Butterfly valve structure code

Table 8 Diaphragm valve structure code

Table 9 Structural form code of plug valve

Table 10 Check valve structure code

Table 11 Structural form code of safety valve

Table 12 Structural code of pressure reducing valve

Table 13 Structural form code of steam trap

Table 14 Structural code of blowdown valve

(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

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

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