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What are the preparation methods for valve models?
With the rapid conditions of modern science and technology, the valve condition more and more complex, diversified, in order to adapt to the special condition requirements, new structure and material valve emerge in endlessly, the valve is difficult to use the standard, so many valve manufacturers and design institute launched its own model preparation method, the preparation method is not unified, this brings to the design selection personnel a lot of inconvenience.
JB / T 308-2004 Valve model preparation method is suitable for the industrial pipeline gate valve gate valve, stop valve, throttle valve, ball valve, butterfly valve, diaphragm valve, plug valve, check valve, safety valve, pressure relief valve, steam drain valve, discharge valve, discharge valve, pipe clamp valve, piston valve model preparation.
Valve model preparation method is as follows: valve body material code, nominal pressure value, valve seat sealing surface or lining material code, structure form code, connection form code, transmission mode code, type code.
What is the type code of the valve model？
Type code is indicated by Chinese Pinyin alphabet, according to the provisions of Table 1-1.
Table 1-1 Valve type code
| type | code name | type | code name |
| gate | Z | Plug valve | X |
| Shut-off valve | J | Check valves and foot valves | H |
| ball valve | Q | Pipe pinch valve | GJ |
| butterfly valve | D | Discharge valve | FQ |
| Diaphragm valve | G | plunger valve | U |
| throttle valve | L | Drain valve | P |
| Spring loaded safety valve | A | Lever safety valve | GA |
| Pressure reducing valve | Y | steam trap | S |
What is the special function code of the valve model？
For other functions or valve codes with other special structures, as specified in Table 1-2.
Table 1-2 Special function code number
| Second function name | code name | Second function name | code name |
| Insulation type | B | Slag discharge type | P |
| Low temperature type | D① | Fast type | Q |
| Fireproof type | F | (stem seal) | W |
| Slow closing type | H | Bellows type |
Low temperature type refers to the use of valve temperature below-46℃.
What is the transmission mode code of the valve model？
The transmission mode code is expressed in Arabic numerals, according to the provisions in Table 1-3.
Table 1-3 Transmission mode code
| transfer method | code name | transfer method | code name |
| Electromagnetic motion | 0 | bevel gear | 5 |
| Electromagnetic-hydraulic | 1 | pneumatic | 6 |
| Electro-hydraulic | 2 | Hydraulic | 7 |
| Worm gear | 3 | Pneumatic-hydraulic | 8 |
| spur gear | 4 | electric | 9 |
Note: 1. Code 1, code 2 and code 8 are used when the valve opens and closes, with two power sources to operate the valve at the same time.
- Hand wheel or handle direct operation of the valve and safety valve, pressure relief valve, trap valve omit this code.
- For pneumatic or liquid motion: 6K and 7K, 6B and 7B; 6S.
- Explosion-proof electric power is represented by 9B; worm-T nut is represented by 3T.
What is the valve model connection form code？
The connection form code is indicated by the Arabic numerals code, as specified in Table 1-4.
Table 1-4 Connection form code number
| transfer method | code name | transfer method | code name |
| Electromagnetic motion | 0 | bevel gear | 5 |
| Electromagnetic-hydraulic | 1 | pneumatic | 6 |
| Electro-hydraulic | 2 | Hydraulic | 7 |
| Worm gear | 3 | Pneumatic-hydraulic | 8 |
| spur gear | 4 | electric | 9 |
What is the structure form code of the valve model？
The structure form code is represented by Arabic numerals, according to the provisions of Table 1-5 to Table 1-7.
Table 1-5, gate valve structure
| Structure form of gate valve | code name | |||
| Valve rod lift type | Wedge brake plate | flexible disc | 0 | |
| (rising stem) | rigidity | Single brake plate | 1 | |
| Parallel gate plate | Single brake plate | 3 | ||
| Valve rod non-lift | Wedge brake plate | Single brake plate | 5 | |
| Parallel gate plate | Single brake plate | 7 | ||
Table 1-6 Structures of globe, throttle, and plunger valves
| Structural form of the stop valve, throttle valve and plunger valve | code name | |
| Valve non-equilibrium | Direct type | 1 |
| Z-shaped flow path | 2 | |
| Three channels | 3 | |
| Angle type | 4 | |
| DC-type (Y-shaped) | 5 | |
| Valve balance | direct connection | 6 |
| Angle type | 7 | |
Table 1-7, Ball valve structure
| Ball valve structure form | code name | |
| Floating ball | Direct flow path | 1 |
| A Y-shaped three-way flow channel | 2 | |
| L-shaped three-way flow path | 4 | |
| A T-shaped three-way flow channel | 5 | |
| Fixed ball | Four-way | 6 |
| Direct type | 7 | |
| A T-shaped three-way flow channel | 8 | |
| The L-shaped three-way flow channel | 9 | |
| Hemisphere direct | 0 | |
What is the valve model pressure code？
① When the pressure level used in the valve meets the requirements of GB / T1048-2005, the unit value (MPa) of 10 times of GB / T1048-2005 standard.
② When the highest temperature of the medium exceeds 425℃, mark the working pressure code at the highest operating temperature.
③ The pressure grade adopts the valve of pound level (1b) or K level unit. When the model is compiled, the unit symbol of lb or K should be included behind the pressure code column
④ Grey cast iron valve body not greater than PN16 and carbon steel valve body greater than or equal to PN25
What is the valve model valve body material code？
The ve material code is indicated by letters according to provisions in Table 1-8.
Table 1-8 Valve body material code
| closed type | Single eccentric | 0 |
| Center vertical plate type | 1 | |
| Double eccentric | 2 | |
| Tri-eccentric | 3 | |
| link mechanism | 4 | |
| Unsealed type | Single eccentric | 5 |
| Center vertical plate type | 6 | |
| Double eccentric | 7 | |
| Tri-eccentric | 8 | |
| link mechanism | 9 |
Note: The labels of CF3, CF8, CF3M, CF8M and other materials can be directly marked on the valve body.
