DBB Threaded Ball Valve

Description
DBB (Double Block and Bleed) 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, DBB valves are compact in structure, light in weight and good in sealing performance. DBB valves in KERUI have three different types, that is, flange type, welded type and threaded type. We can customize these valves according to your specifications.

Application
DBB threaded ball valve can be widely used in such pipelines as tap water, sewage, construction, petroleum, chemical, food, medicine, textile, electric power, shipbuilding, metallurgy, energy systems, etc.

Advantages
1. DBB threaded ball valve features excellent sealing performance, low friction between sealing surfaces and long service life.
2. The body of this DBB valve is cast in precision. Thus it is good in performance. The surface is finished twice, thus it is smooth and bright. The bonnet is processed by numerical control machine.
3. KERUI has been awarded by ISO9001:2008 international system certification, API 6D certification, CE certification, etc.

Performance
1. Sealing materials can be chosen based on media involved to strengthen sealing performance and wear resistance, reducing cost.
2. Our DBB threaded ball valves are guaranteed within 18 months and enjoy lifelong technical service.

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

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

Structure of DBB Threaded Ball Valve

Standards of DBB Threaded Ball Valve
Pressure Rating: ASTM B16.5
Flange End: ASME B16.5
Temperature: -53~1000℉(10~537℃)
Full Port: 3/8~ 2in- (9.5MM~50.8MM)

Parts and Functions

1. Whole valve structure: no leakage
2. Independent handle (nut): fix stem without handle
3. Ball valve
4. Stainless handle and cover: strengthen corrosion-resistance performance
5. Bleeder valve
6. Ball valve
7. Load and elastic seat: guarantee sealing performance in high/low temperature or low voltage condition
8. O-ring: guarantee sealing performance in various condition
9. Flange sealing surface has smooth and sawtooth types.

Dimensions of DBB Threaded Ball Valve