Single Flanged Single Block and Bleed Ball Valve / SBB Valve / Dbb Valve

Single Flanged Single Block and Bleed Ball Valve / SBB Valve / Dbb Valve

Double block and bleed valve assemblies have three valves - primary isolation, secondary isolation and bleed - all integrated into a single block.  If required the inlet or outlet end connection can incorporate a spring loaded in-line piston check valve.  The end connectors are interchangeable and can be specified to suit exact requirements.
Our Ball valve double block and bleed assembly is very compact and is recommended for general services.  The valve can incorporate Needle, Globe, Gate and Check valves into the design to suit particular duty specifications as required.

Single Flanged Single Block and Bleed Ball Valve / SBB VALVE Features
Directly mounted on  the flanged of piping connection ,hen the overall height is reduced.
Helps to reduce weight and cost.
Flange conncections conforming to ANSI B16.5.
Working Pressure to Flange Class.
Stainless steel construction with options of packing for high temperature application.
Colour coded dust caps for identification of valve type.
Metal to metal seating for constant compression.
Thread rolled and burnished stem.
Hardened tip for extended leak proof life.

Feature:
Process Isolation
Drain Line Isolation
Double Block & Bleed
Blow Out Proof Stem Design
ISO 5211 Mounting Pad
Fire-safe Certified API 607
Anti-Static Device
Bi-directional Sealing
Low Fugitive Emission Packing
Locking Device Standard

Double Block and Bleed ball valve Applicable 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: API598        GB/T909

Double Block and Bleed 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/API 6FA/API 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. 

Applications
HP instrument connections for in line maintenance
Process vents
Process drains
Level instrument gauges
Injection points (with check)

Main Parts and Material. 

NO	Part name	Material
		GB	ASTM
1	Valve body	WCB	A2116-WCB
2	Sealing ring	PTFE	PTFE
3	Sphere	1C18Ni9Ti	SS304
4	Nut	35	A194-2H
5	Stud	35CrMoA	A193-B7
6	The stone body	WCB	A216-WCB
7	Shim	Graphite + stainless steel	B12.10-304F/.G
8	Filler	PTFE	PTFE
9	Packing gland	WCB	A2116-WCB
10	Locating piece	25	A105
11	Ring	65Mn	AISI 1066
12	Handle	K33	A47-667  Gr.32510
13	Valve stem	1Cr33	A276-410
14	Screw	35	A193-B7
	Thrust washer	PTFE	PTFE

Size:	2" ~ 24"(DN50~DN400)
Pressure:	ANSI Ratings 150# ~ 2500# (PN16~PN420)
Structure:	3 Pieces Body Design
Connections:	RF RTJ BW Connections
Body Material:	ASTM A105, A182 304, A182 316, A182 304L, A182 316L,A182 F6A,A182,F51,A182 F53,F22 Alloy
Ball Material:	ASTM A105, A182 304, A182 316, A182 304L, A182 316L,A182 F6A,A182,F51,A182 F53,F22 Alloy
Seats Material:	PTFE/ RTFE(≤120ºC) , NYLON (≤80ºC), PEEK/PPL  (≤250ºC)
Driving means:	Manual,worm gear.etc.
Flow direction:	bidirectional
Applicable medium:	Seawater,all kinds of harsh environment

 

DN	1/2"-2"
Class	150lb-2500lb
Outlet	1/2"F-NPT,3/4"F-NPT,1"F-NPT
Vent	1/2"F-NPT,1/4"F-NPT.

 

Primari Isonation	Secondary Isolation	Drain
Ball	Ball	Needle
Needle	Needle	Needle
Ball	Needle	Needle

 

Design basis	GB series	American Standard Series
Design standard	GB/T12237	AP16D	ANSI B16.34
Flange connection structure length	GB/T12221	AP16D	ANSI B16.10
The length of the structure ( welding )	GB/T15188.1	AP16D	ANSI B16.10
Connecting flange	GB/T9113  JB/T79  Hg20592	ANSI B16.5
Butt welding ends	GB/T12224	ANSI B16.25
Test and inspection	GB/T9092	AP16D	AP1598

Main Dimensions
 

Nominal diameter	15	20	25	40	50	65	80	100	125	150	200
d1	13	19	25	38	64	64	76	102	127	152	203
L	108	117	127	165	191	191	203	229	356	394	457
H	59	63	75	95	142	142	152	178	252	272	342
W	130	130	160	230	400	400	400	650	1050	1050	1410
Wt(kg)	2.5	3	5	7	15	19	19	33	58	93	160