Double Block and Bleed Lever Operated/Trunnion Dbb Ball Valve

Product Description

Double Block and Bleed Lever Operated/Trunnion Dbb Ball Valve

Product Description

Double Block & Bleed Flanged Ball Valve Product Description 
name of  commodity: DBB Double Block & Bleed Floating Ball Valve (DBBQ41F) Floating Ball Valve
Nominal diameter:1/2"-12"
Nominal pressure:150Lb-600Lb , 10K-40K
Applicable temperature: -196~250ºC, 250~425ºC
Available material: CS, SS, FS,304,316,316 L, CF8, CF8M ,  chrome molybdenum   steel , Low temperature steel.
Driving type :Electric, Pneumatic, Worm wheel, manual, hydraulic .(Note: Pictures of products for worm gear drive)
Applicable medium: water, gas, oil product, Food, medicines, chemicals natural gas and corrosive medium as acid, alkali, etc.

Specification

Double Block & Bleed Flanged Ball Valve Specification

Design standard: ANSI B16.34     GB/T12237
Physical dimension: ANSI B16.10    GB/T12221
Flanges dimension: ANSIB16.10     GB/T15188.1
Test and inspection: ANSI598        GB/T909
 
Double Block & Bleed Flanged Ball Valve structure characteristics

1. The double block and bleed valve have evolved to replace and add the process of bolting together individual valves to make the valves in one body .it saved a lot of space and material.
2. Special designs including injecting quills ,sample probes ,double block and single block, in-built check valves and seat wipers.
3. Dual isolation is necessary requirement when maintenance is taking place down stream of the first isolation valve. Cavity venting is provided by either a ball or globe OS&Y vent valve so that trapped pressure between the two isolation valves is safely vented.
4.  These valves have also evolved to encompass the function of chemical injection (using a suitable quill) and sample points .In-built check valves are often integrated in these valves.
5. Fire Safe according to BS6755/ANSI 6FA/ANSI 607, since each sealing point is provided by a secondary fire-safe seal in graphite. Valve soft seats also are provided with secondary metal-to metal seal in case of fire.
6. Valve design can be either Trunnion or floating type ,anti blow -out stem and typically SPE seat design .Drain port is normally provide with a floating ball valve ,to be fitted with final user drain line .valve seats can be soft or metal to metal hard-faced. 

Double Block & Bleed Flanged Ball Valve Standards compliance:
                                      Design and Manufacture: ANSI 608, ANSI 6D
                                      Face to face(end to end): ANSI B16.10, ANSI 6D
                                      Flanged connection: ANSI B16.5
                                      Fire-safe: ANSI 607,ANSI 6FA
                                      Butt welded end: ANSI B16.25
                                      Test and inspection: ANSI 598,ANSI 6D

Our Advantages

Double Block & Bleed Flanged Ball Valve Advantage:

1. The fluid resistance is small, its resistance coefficient with section of equal length.
2. Simple structure, small volume, light weight.
3. Compact and reliable, the widespread use of plastic ball valve sealing surface of materials, good sealing, also has been widely used in the vacuum system.
4. Easy to operate, open and close quickly
5. Easy maintenance, simple structure of ball valve, sealing ring, which generally remove replacement is more convenient.
6. In the fully open or fully closed, the ball and seat sealing surface and the dielectric isolation, medium through, can not cause the valve sealing surface erosion.
7. Applicable scope is wide, size from small to several millimeters, big to a few meters, from high vacuum to high pressure can be applied.

Product Parameters

Double Block & Bleed Flanged Ball Valve dimensions 

Dimensions
Class 150
Size	inch	1/2	3/4	1	1-1/2	2	2-1/2	3	4	6	8
L-RF	mm	108	117	127	165	178	191	203	229	394	457
L1-BW	mm	140	152	165	190	216	241	283	305	457	521
L2-RTJ	mm	-	-	140	178	191	203	216	241	406	470
B	mm	13	19	25	38	51	64	76	102	152	203
H	mm	65	70	80	95	110	135	145	170	235	275
K	mm	150	155	160	180	200	225	325	350	500	600
WT.	Kg	3	4	5	8	12	21	26	43	80	155

 

Dimensions
Class 300
Size	inch	1/2	3/4	1	1-1/2	2	2-1/2	3	4	6	8
L-RF	mm	140	152	165	190	216	241	283	305	403	502
L1-BW	mm	140	152	165	191	216	241	283	305	457	521
L2-RTJ	mm	151	165	178	203	232	257	298	321	419	518
B	mm	13	19	25	38	51	64	76	102	152	203
H	mm	70	85	90	105	120	145	160	195	250	290
K	mm	155	160	180	200	225	325	350	500	600	700
WT.	Kg	3	5	7	13	15	28	32	55	105	17

Product Details

Double Block & Bleed Flanged Ball Valve materials

Materials
NO.	Part name	Material
13	Handle	Carbon steel
12	Lock nut	Carbon steel
11	Gland nut	Carbon steel
10	Thrust washer	PTEF/NYLON
09	Gland bush	Stainless steel
08	Stem	Stainless steel

 

NO.	Part name	WCB	LCB
07	Stud and nut	A193 Gr B7/A194 Gr 2H	A320 Gr L7/A194 Gr 4
06	Packing	Graphite/ptfe	Graphite/ptfe
05	Ball seat	PTFE/RPTFE/NYLON	SPTFE/RPTFE/NYLON
04	Gasket	Graphite/spiral wound	Graphite /spiral wound
03	Ball	A182 F6a	A182 F304
02	R-body	A216 Gr WCB	A352 Gr LCB
01	L-body	A216 Gr WCB	A352 Gr LCB

 

NO.	Part name	CF8	CF8M
07	Stud and nut	A193 Gr B16/A194 Gr 4/7	A193 Gr B7/A194 Gr 2H
06	Packing	Graphite/ptfe	Graphite/ptfe
05	Ball seat	PTFE/RPTFE/NYLON	PTFE/RPTFE/NYLON
04	Gasket	Graphite /spiral wound	Graphite /spiral wound
03	Ball	A182 F304	A182 F316
02	R-body	A351 Gr CF8	A351 Gr CF8M
01	L-body	A351 Gr CF8	A351 Gr CF8M

Thank you for visiting our website, if you have any doubts you can feel free to contact us ,we will try our best to provide you with quality service.  

View of the factory

   

Product Photo

Packaging & Shipping