DBB Flanged & Welded Ball Valve

Description
Double block and bleed valves, also named DBB valves, are a space-saving dual isolation solution that reduces the need for costly multi-valve systems. By combining all block and bleed components into a single unit, KERUI DBB flange and welded ball valve minimizes the risk of leak paths to atmosphere while providing significant weight savings.

Advantages
1. DBB valves are integrally forged. They are compact in structure and light in weight, thus reducing installation and maintenance requirements.
2. Double block and bleed valves are commonly used throughout the oil and gas extraction industry, especially on floating platforms and storage vessels where space is a primary concern.
3. KERUI has been awarded by ISO9001:2008 international system certification, API 6D certification, CE certification, etc.
4. Sealing materials can be chosen based on media to increase sealing performance and wear resistance, reducing cost.
5. DBB valves can be custom engineered to meet various lengths, heights, and connection sizes.
6. Our double block and bleed valves are guaranteed within 18 months and enjoy lifelong technical service.

Features of DBB Valve
1. Compact design
2. Uninterrupted flow for negligible pressure drop
3. Reduced leakage points
4. Space, weight, and cost savings versus multi-valve systems
5. Reduced installation and maintenance requirements
6. Designed and engineered on a case-by-case basis
7. Compact profile for reduced risk of vibration damage
8. Optional features include probes, check valves, seat wipers, and injection quills

Components
DBB valves are mainly composed of valve body, bonnet, ball, valve stem, valve seat, sealing materials, etc.

Specifications
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

Structure of DBB 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

1. Double sealing o-ring: To prevent the leakage as the stem.
2. Blow-out proof stem: It is internally inserted the body and function as the up-sealing seat.
3. Ball valves are equipped with preloaded spring floating seat ring to ensure sealing performance even in low pressure.
4. Adopting double ball valve is to reduce the leakage in the stem and to achieve quick-safely bleeding.
5. Ball valves are equipped with preloaded spring floating seat ring to ensure sealing performance even in low pressure.
6. Blow-out proof stem: It is internally inserted the body and function as the up-sealing seat.