Description
DBB (Double Block and Bleed) flanged ball valve is off-line repairable. Prior to maintaining the valve, bring the double block and bleed valve to the open position, ensuring to release line pressure and drain all trapped media from the valve cavity. Keep the valve in the open position and remove all but one body bolt, so the valve body can be removed from its installed position and be brought out of the pipeline. In this position, it is easy to replace all internal parts and then swing the body back to its original position.
Application
DBB flanged ball valve is commonly used in such pipelines as tap water, sewage, construction, petroleum, chemical, food, medicine, textile, electric power, shipbuilding, metallurgy, energy systems, etc.
Advantages
1. DBB flanged ball valve is compact in structure and light in weight, saving space and reducing installation time.
2. This double block and bleed valve minimizes the risk of furnace explosion and increases system reliability.
3. Sealing materials can be chosen based on media to strength sealing performance and wear resistance, reducing cost.
4. Our double block and bleed valves are guaranteed within 18 months and enjoy lifelong technical service.
Structure of DBB Flanged Ball Valve
|
No.
|
Part Name
|
ASTM Material
|
|
Carbon Steel
|
Alloy Steel
|
Stainless Steel
|
|
1
|
Bonnet
|
ASME A105
|
A352-LCB
|
A217+WCB
|
A351-CF8
|
A351-CF8M
|
|
2
|
Spring
|
INCLONEL750
|
A313-304
|
A313-316
|
A313-316
|
A313-316
|
|
3
|
Seat O Ring
|
Viton
|
Viton
|
Viton
|
Viton
|
Viton
|
|
4
|
Seat
|
ASME A105+ENP
|
A350-LF2 +ENP
|
A182+F316
|
A182-F304
|
A182-F316
|
|
5
|
Seat Ring
|
PTFE
|
PTFE
|
R.PTFE
|
Glass Filled PTFE
|
|
6
|
Stud
|
A193-B7
|
A320-L7
|
A193-B7
|
A193-B8
|
A193-B8
|
|
7
|
Connection Plate
|
ASTM A105
|
A352-LCB
|
A217-WC6
|
A351-CF8
|
A351-CF8
|
|
8
|
Packing Case
|
F4
|
|
9
|
Grease Injection Valve
|
SS
|
|
10
|
Stem O Ring
|
Viton
|
Viton
|
Viton
|
Viton
|
Viton
|
|
11
|
Stem
|
A182 F6a
|
A276-304
|
A276-316
|
A276-304
|
A276-316
|
|
12
|
Ball
|
ASTM A105+ENP
|
A182-F304
|
A182-F316
|
A182-F304
|
A182-F316
|
|
13
|
Body
|
ASTM A105
|
A352-LCB
|
A217-WCB
|
A351-CFB
|
A351-CF8M
|
|
14
|
Trunnion
|
A276-304
|
A276-316
|
A276-304
|
A276-316
|
|
15
|
Lower Cover
|
ASTMA105
|
A352-LCB
|
A217-WCB
|
A351-CFB
|
A351-CF8M
|
Specifications of DBB Flanged Ball Valve
1. Double block and bleed ball valve bore, 4-24″ 100-600 mm
2. Double block and bleed ball valve pressure, 150LB~2500LB, 1.6Mpa~32Mpa
3. Full Port Design
4. Bolted Bonnet Split Body
5. Three Pieces Body
6. Trunnion Mounted Ball Type
7. Blow Out Proof Stem
8. Fire Safe Construction
9. Anti Statics Device
10. ISO 5211 Mounting Pad
Standards and Tests
1. Design Standard: API 6D
2. Face to Face: ASME B16.10
3. End Flanges: ASME B16.5
4. Inspection and Test: API 598
