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.
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DBB ball valves are designed specifically for chemical injection systems, providing reliable isolation and leak prevention. It combines the dual block and bleed (DBB) function with gear operation to ensure smooth control even in high torque applications. The valve is connected by butt welding (BW) and socket welding (SW) for flexible installation.
Adopting anti-static design can reduce the risk of static electricity accumulation when handling flammable chemicals and improve safety. This valve is made of high-quality materials and can withstand harsh industrial environments, making it a reliable choice for chemical injection in industries such as oil and gas, petrochemicals, and chemical processing.
● Anti-Static Design: Prevents static electricity accumulation and ensures safe handling of flammable or volatile chemicals.
● Double Block and Bleed (DBB) Functionality: Provides two-layer isolation to enhance leak prevention and safety during maintenance.
● Flexible Connection Options: Can provide butt welding (BW) and socket welding (SW) connections for easy integration into various systems.
● Gear Operated Mechanism: Ensure smooth operation, especially in larger valve sizes or applications that require higher torque.
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 | |
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 |
| Primari Isonation | Secondary Isolation | Drain |
| Ball | Ball | Needle |
| Needle | Needle | Needle |
| Ball | Needle | Needle |
| 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 | ||||||||
Q1:What is a DBB Ball Valve?
A DBB (Double Block and Bleed) Ball Valve provides two layers of isolation, ensuring that fluids are safely contained and preventing leakage during maintenance or operation.
Q2:What is the benefit of using a gear-operated ball valve?
The gear-operated mechanism ensures smooth operation, especially for larger valve sizes or applications requiring higher torque, providing more control and ease of use.
Q3：How does the anti-static design improve safety?
The anti-static design prevents the buildup of static electricity, reducing the risk of sparks or ignition when handling flammable or volatile chemicals.
Our DBB ball valve places great emphasis on safety and performance, adopting advanced features such as anti-static design and dual block and bleed (DBB) function. We understand that every application is unique, which is why we provide customized solutions based on your specific needs. Whether you need flexible installation options such as butt welding (BW) and socket welding (SW) connections, or require fire safety certification for high-risk environments, we can ensure that your system operates safely and efficiently. Choose us, we offer reliable and high-performance valves designed to meet the needs of the most critical applications.
