API 600 and API6 D are different standards for gate valve. Now let us check what's difference between API600 and API6D design for gate valve.
1.Difference of three basic size for gate valve: Valve length, Inside diameter, Flange Size.
| design standard to follow | API 600 | API 6D |
| Valve length | ASME B16.10 | A table called gate valve face to face and end to end dimensions |
| Inside Diameter | ASME B16.34 | A talbe called minimum bore for full opening valve |
| Flange Size | ASME B16.5 | ASME B 16.5 |
2. Difference of Valve Gate and Valve Seat:
Valve Gate for API 600 Design is Wedge Type and Valve Gate for API 6D design is Slab Type; Valve Seat for API 600 is Inside valve body and is available to move for API 6D. Most Import is API 6D gate Valve is self relieving cavity.
3. Usage:
API 600 Gate valve is suitable for high temperature high pressure medium; API 6D gate valve is not suitable for high temperature medium as the O ring is soft meterial.
