Size: DN50~DN600 Pressure rating:150Lb~2500Lb Double Block and Bleed Ball Valve

Model NO. Double Block and Bleed Ball Valve

Size: DN50~DN600
Pressure rating:150Lb~2500Lb
End Connection Standards
Face to Face : Manufactured & Standard
Flange Dimensions : ASME B16.5, EN 1092 , JIS B 2220
Butt weld End Dimensions : ASME B16.25,
Socketweld End Dimensions : ASME B16.11
Screwed End Dimensions : ASME B 16.11
End connection: RF/RTJ/BW
Operation: Lever Gear motor/pneumatic actuators

Design: Blow-out proof stem design, Anti-static design and API 6FA Fire Safe Design

Bore: Full Bore and Reduced Bore

Certificate: CE/PED, ISO, ATEX, SIL, FIRE SAFE

Quantity

DBB BALL Valve of SJ

TheS J Double Block and Bleed (DBB) Ball Valve is an integrated single-body valve assembly featuring two independent ball seals with a bleed port located in the intermediate cavity. It delivers superior safety by enabling cavity pressure relief between the two sealing seats. This all-in-one design saves installation space and reduces potential leak points compared to using multiple separate valves, which makes it well-suited for critical isolation applications in oil & gas, petrochemical and pipeline systems.

Technical specification
Design reference		API	ASME	rOCT
Design standard		API6D	ASME B16.34	/
Structural length	Flanged ends	API6D	ASEM B16.10	/
	Welded connection
Flanged ends		ASME B16.5/ASME B16.47		rOCT 33259 rOCT 12815
Butt-welding ends		ASME B16.25
Test&inspection		API6D	API598	rOCT 9544
Notes:The sizes of valve connectingflange and butt-welding terminas can be designed according to customer's requirement.

Main material			Main material
	Part Name	Main Material		Part Name	Main Material
1	Body	WCB,LCB,LCC,4A,CF8,CF3,CF3M,CF8M,G20Mn5,F51 A105,LF2,F304,F304L,F316,F316L,F321,F416,F440C, 17-4PH,Inconel,Monel,Alloy steel,Aluminium Bronze	16	Trunnion	410,LF2,F304,F304L,F316,F316L,F321,F416,F440C,F51, Inconel,Monel,Alloy steel,Aluminium Bronze
2	Cover		17	Drain plug	Component
3	Ball	A105,LF2,F304,F304L,F316,F316L,F321,F416,F440C,F51,In- conel,Monel,Alloy steel,Aluminium Bronze	18	Grease injection valve	Component
4	Seat Retainer	F51,Inconel,Monel,Alloy steel,Aluminium Bronze	19	Anti static device	IncX750
5	Seat Seal	PTFE,RPTFE,DEV,NLY,PPL,POM,PEEK,+STL,+TCC,+Ni60 410,LF2,F304,F304L,F316,F316L,F321,F416,F440C,F51, Inconel,Monel,Alloy steel,Aluminium Bronze	20	Spring	IncX750
6	Stem		21	Hexagon socket screw	B7,B7M,L7,L7M,Inconel,Monel,Alloy steel,Aluminium Bronze
7	Thrust Washer	PTFE	22	Spiral Wound Gasket	SS+Graphite
8	Pin	1035,410,F304,F316,F51	23	O Ring	HNBR,VITON,VITON AED,VITON GTL
9	Flexible graphite braided filler	Graphite	24	Nut	2H,2HM,7,7M,Inconel,Monel,Alloy steel,Aluminium Bronze
10	Spiral Wound Gasket	SS+Graphite	25	Stud	B7,B7M,L7,L7M,Inconel,Monel,Alloy steel,Aluminium Bronze
11	Connecting flange	A105,LF2,F304,F304L,F316,F316L,F321,F416,F440C,F51,In- conel,Monel,Alloy steel,Aluminium Bronze	26	Flexible graphite braided filler	Graphite
12	key	1035	27	O Ring	HNBR,VITON,VITON AED,VITONGTL
13	O Ring	HNBR,VITON,VITON AED,VITON GTL	28	O Ring	HNBR,VITON,VITON AED,VITON GTL
14	Hexagon socket screw	B7,B7M,L7,L7M,Inconel,Monel,Alloy steel,Aluminium Bronze	29 30	Spiral Wound Gasket	SS+Graphite
15	Bearing	F304+PTFE,F316+PTFE,F51+PTFE	29 30	O Ring	HNBR,VITON,VITON AED,VITON GTL
			31	Hexagon socket screw	B7,B7M,L7,L7M,Inconel,Monel,Alloy steel,Aluminium Bronze
Notes:Major parts of the valve series and materials of sealing surface differ according to actual working condition and customer's special requirement.

Double Block and Bleed Ball Valve
Full bore
Nominal Size		D		L		H		W		Weight
in	mm	in	mm	in	mm	in	mm	in	mm	Lb	kg
2	50	2	49	7.0	178	6.5	165	9.06	230	37.5	17
3	80	3	74	8.0	203	7.6	193	15.75	400	72.8	33
4	100	4	100	9.0	229	9.09	231	18.11	460	110.2	50
6	150	5.91	150	15.5	394	12.95	329	39.37	1000	205.0	93
8	200	7.91	201	18.0	457	15.47	393	19.69	500*	366.0	166
10	250	9.92	252	21.0	533	15.79	401	19.69	500*	601.9	273
12	300	11.93	303	24.0	610	17.36	441	19.69	500*	1047.2	475
14	350	13.15	334	27.0	686	18.94	481	19.69	500*	1256.6	570
16	400	15.16	385	30.0	762	23.54	598	19.69	500*	1715.2	778
18	450	17.16	436	34.0	864	25.31	643	19.69	500*	2061.3	935
20	500	19.17	487	36.0	914	27.87	708	23.62	600*	2623.5	1190
22	550	21.18	538	40.0	1016	31.42	798	23.62	600*	2967.4	1346
24	600	23.19	589	42.0	1067	33.98	863	23.62	600*	3481.0	1579

The above parameters are based on Class150-1.6~2.5MPa and are for reference only. For detailed information, please consult the technical team.

FAQ for S J Double Block and Bleed Ball Valve

Q1: What is a Double Block and Bleed (DBB) Ball Valve?

Answer: The DBB ball valve is a compact single-unit valve assembly equipped with two independent sealing seats and a bleed port between the seals. When fully closed, it can block pressure from both sides of the valve and release trapped cavity pressure through the bleed port, achieving safe isolation for pipeline maintenance. It is widely adopted in oil, gas and petrochemical critical isolation applications.

Conclusion from S J: S J DBB ball valve integrates double block and bleed function within one valve body, providing reliable safety isolation for your process system.

Q2: What is the difference between an integrated DBB ball valve and two separate ball valves with a bleed port?

Answer: Two separate ball valves plus a bleed fitting can realize DBB function theoretically. However, this combination requires extra flanges, gaskets and bolt connections, creating more potential leak paths, larger installation space, heavier weight and longer on-site assembly time. The integrated DBB ball valve cuts connection points, saves space and weight, and simplifies installation and routine inspection.

Conclusion from S J: S J recommends integrated DBB ball valve over twin separate valves for critical isolation projects to lower leakage risks and reduce site installation workload.

Q3: What media and working conditions are suitable for S J DBB ball valves?

Answer: Our DBB ball valves can handle a wide range of media including natural gas, crude oil, refined oil and various common process fluids. We can adjust valve body and sealing materials according to your working temperature, pressure and corrosive properties of the medium to match your site operating conditions.

Conclusion from S J: S J can customize material configurations for DBB ball valves to fit your unique working conditions and process media.

Q4: What typical applications are suitable for S J DBB ball valves?

Answer: DBB ball valves are selected for critical isolation scenarios that demand high safety, such as oil & gas pipelines, refineries, chemical plants, metering skids and onshore & offshore facilities. It isolates equipment for safe maintenance, prevents medium leakage and verifies sealing integrity via the bleed port.

Conclusion from S J: S J DBB ball valve serves as the ideal isolation solution for high-risk oil, gas and petrochemical process systems.

S J Overall Conclusion

S J integrated Double Block and Bleed Ball Valve features compact construction, reduced leak paths and dependable cavity pressure relief. Compared with traditional multi-valve combinations, it delivers safer, space-saving and cost-effective critical isolation performance, and can be tailored to suit different working media and site environments. It is a trustworthy valve solution for global oil & gas and petrochemical projects.

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Head Office Address: Viale del Lavoro.19,20003 Casorezzo Ml. Italy Testing zone
Address:Via S. Giovanni Bosco S.n.c.70020 – Poggiorsini (BA) – ITALY

EMAIL: andant@sanjingvalve.com
PHONE: +39 389 949 9067
WHATSAPP: +39 389 949 9067

Branch Office Address: Dongou Industrial Zone, Oubei Street, Yongjia Wenzhou City, Zhejiang Province China Testing zone 2 Address:No. 205, Linwu Road, Sanqiao Industrial Zone

What exactly is the relationship between SANJING Valve Company and SJ Valvole S.R.L.?

SANJING Valve Company is the main manufacturing company, responsible for valve production, quality control, testing, and technical support. SJ Valvole S.R.L. serves as SANJING’s Italian office, supporting its business development, customer communication, and commercial activities in Italy and the European market.

Integrated Manufacturing and European Service

The two operations work together to provide customers with coordinated manufacturing and local market support:

Manufacturing & Quality Control: SANJING Valve Company manages valve manufacturing, inspection, testing, and quality control at its production facilities.

European Market Support: SJ Valvole S.R.L. supports customer communication, commercial coordination, and business development in Italy and other European markets.

Project Coordination: Customer requirements, technical specifications, documentation, production, and delivery can be coordinated between the Italian office and the manufacturing team.

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