Trusted DBB Valve Manufacturer
NTVAL provides DBB Valves with a double block and bleed design for zero leakage and reliable isolation. ISO9001 and API6D certified, our valves ensure top performance and durability. Backed by an 18-month warranty and strong support, they offer excellent value.
Reliable DBB Valve
Characteristics of the Valve System
- Double Block and Bleed Design: Features double fixed balls hinged on supports, with floating metal or soft seats.
- Central Needle Vent Valve: Includes a central needle vent valve for controlled pressure release.
- Pressure and Temperature Range: Operates within a pressure range from ASME Class 150 to ASME Class 2500 and a temperature range from -46°C to 450°C.
- Construction Type: Side-entry forged steel valves, with an optional top-entry design available upon request.
- Performance: Offers low-pressure loss through the valve and requires low actuation torque.
- Compliance: “CE” marked, complying with PED Directive 97/23/EC.
- Bore Options: Available in full bore or reduced bore designs.
- End Connections: Compatible with various end connections including RF/RTJ flanges, butt welds, clamp connections, and socket welding.
- Material Options: Wide selection of materials based on service conditions, including carbon steel, stainless steel, Duplex steel for corrosive environments, and Chrome-Molybdenum alloy steel for high-temperature applications.
- Corrosion Resistance: Materials meet NACE MR0175 standards for anti-corrosion properties.
- Optional Overlays: Seat pocket area overlay, seal area overlay, or complete cladding on wetted surfaces available on request (options include welded overlays in Inconel 625, Stainless Steel 316, or Electroless Nickel Plating).
- Actuation Options: Suitable for manual operation (wrench or gear) or motorized actuation (hydraulic, pneumatic, gas-over-oil, or electric actuators).
Quality Control
The Positive Material Identification (PMI) test confirms that the DBB valve is made from the correct materials for durability and performance.
PMI Test
The sealing test checks if the DBB valve prevents leaks, confirming that it can control pressure and maintain safe operation.
Sealing Test
The low emission test detects gas leaks in the DBB valve to make sure it meets environmental safety standards by reducing emissions.
Low Emission Test
The impact test checks how well the DBB valve handles sudden shocks, confirming that it can withstand harsh operating conditions.
Impact Test
The dimension inspection verifies the DBB valve’s size and shape, making sure it fits accurately and works properly in its system.
Dimension Inspection
The painting thickness test checks if the DBB valve has enough protective coating, which helps prevent corrosion and extends its lifespan.
Painting Thickness Test
Penetrant Testing (PT) checks for surface cracks in the DBB valve to confirm there are no hidden defects that could cause failure.
PT
The material inspection verifies that the DBB valve parts are made from the correct materials, helping maintain quality and proper function.
Material Inspection
Our Valve Applications in Key Industries
Discover how our advanced valve solutions improve flow control, delivering enhanced efficiency, safety, and strict quality assurance.
DBB valves offer precise control and prevent leaks, making them perfect for handling dangerous chemicals in the processing industry.
Chemical Processing
DBB valves help control pressure and prevent fluid leaks, providing safe and reliable solutions for the petrol chemical industry’s operations.
Petrol Chemical
DBB valves deliver strong sealing performance, ensuring safe operation in nuclear environments where safety and leak prevention are critical.
O.P.G & Nuclear
DBB valves handle the high pressure and flow control needed in pulp processing, keeping the system efficient and running smoothly.
Pulp
DBB valves work well under extreme conditions, providing reliable pressure control and leak prevention in the mining industry’s tough environments.
Mining
DBB valves provide precise control over water flow and prevent contamination, making them a great solution for the water and sewage industry.
Water & Sewage
DBB valves help control steam flow and prevent leaks, maintaining efficiency and safety in systems that use high-temperature steam.
Steam System
DBB valves regulate pressure and flow, offering dependable performance in boiling systems where heat and fluid control are essential.
Boiling System
Get More Versatile Valve
Main Parts
- Closure
- Body Stud-Nut
- Seat Ring
- Adapter Flange
- Body
- Closure Back-Up Ring
- Ball
- Gland Flange
- Trunnion
- Gland Flange Gasket
- Gland Flange Back-Up Ring
- Gland Flange O-Ring
- Trunnion Cap Screw
- Stem
- Gland Flange Cap Screw
- Stem Thrust Washer
- Trunnion Gasket
- Ball Bushing
- Seat Spring
- Body Stud
- Stem O-Ring
- Seat Gasket
- Seat Back-Up Ring
- Seat O-Ring
- Body Gasket
- Closure O-Ring
- Stem Gasket
- Stem Back-Up Ring
- Trunnion Back-Up Ring
- Trunnion O-Ring
- Gland Flange Cap Screw
- Adapter Flange Bushing
- Washer
- Cap Screw
- Vent Needle Valve
- Stem Key
Double Block & Bleed Ball Valve
- Double Block and Bleed, Double Ball
- Full or Reduced Port, Fire Safe, Blow-out Proof Stem
- Anti-static Device, Cavity Relieving Seats
- NACE MR-01-75, Optional Locking Device
- Designed to ASME B16.34, API 6D
| Face to Face | API 6D |
| End Flange | ASME B16.5 |
| Buttweld | ASME B16.25 |
| Class | ASME CL150~900 |
| Face to Face | API 6D |
| End Flange | ASME B16.5 |
| Buttweld | ASME B16.25 |
| Class | ASME CL1500/2500 |
ASME CL150~900
ASME CL150~300
| SIZE (in.) | A | B | C | W.T (Ibs) | SIZE (in.) | A | B | C | W.T (Ibs) | |||||
| RF | BW | RTJ | RF | BW | RTJ | |||||||||
| 2″ | 312 | 378 | 334 | 98 | 105 | 81 | 2″ | 378 | 378 | 406 | 102 | 120 | 92 | |
| 3″ | 355 | 495 | 378 | 127 | 130 | 165 | 3″ | 495 | 495 | 522 | 148 | 164 | 176 | |
| 4″ | 401 | 534 | 422 | 165 | 130 | 330 | 4″ | 534 | 534 | 562 | 165 | 130 | 374 | |
| 6″ | 690 | 800 | 711 | 235 | 288 | 455 | 6″ | 705 | 800 | 733 | 206 | 237 | 583 | |
| 8″ | 800 | 912 | 823 | 239 | 288 | 660 | 8″ | 879 | 912 | 907 | 239 | 288 | 770 | |
| 10″ | 933 | 978 | 956 | 277 | 326 | 1056 | 10″ | 994 | 978 | 1022 | 277 | 326 | 1166 | |
| 12″ | 1068 | 1111 | 1089 | 316 | 364 | 1518 | 12″ | 1134 | 1111 | 1162 | 316 | 364 | 1681 | |
| 14″ | 1201 | 1334 | 1223 | 341 | 395 | 2031 | 14″ | 1334 | 1334 | 1362 | 341 | 395 | 2321 | |
| 16″ | 1334 | 1467 | 1356 | 383 | 437 | 2886 | 16″ | 1467 | 1467 | 1495 | 383 | 437 | 3247 | |
| 18″ | 1512 | 1600 | 1533 | 417 | 471 | 3480 | 18″ | 1600 | 1600 | 1628 | 432 | 486 | 4490 | |
| 20″ | 1600 | 1734 | 1622 | 454 | 508 | 4473 | 20″ | 1734 | 1734 | 1768 | 478 | 532 | 5925 | |
| 24″ | 1867 | 2000 | 1890 | 529 | 590 | 6961 | 24″ | 2000 | 2000 | 2039 | 578 | 640 | 6961 | |
ASME CL600~900
| SIZE (in.) | A | B | C | W.T (Ibs) | SIZE (in.) | A | B | C | W.T (Ibs) | |||||
| RF | BW | RTJ | RF | BW | RTJ | |||||||||
| 2″ | 511 | 511 | 516 | 105 | 129 | 99 | 2″ | 644 | 644 | 649 | 108 | 129 | 128 | |
| 3″ | 623 | 623 | 628 | 147 | 164 | 176 | 3″ | 667 | 667 | 672 | 147 | 164 | 187 | |
| 4″ | 756 | 756 | 761 | 165 | 184 | 462 | 4″ | 800 | 800 | 805 | 165 | 184 | 568 | |
| 6″ | 978 | 978 | 984 | 212 | 237 | 693 | 6″ | 1068 | 1068 | 1073 | 212 | 237 | 792 | |
| 8″ | 1155 | 1155 | 1162 | 254 | 304 | 1100 | 8″ | 1290 | 1290 | 1295 | 254 | 304 | 1276 | |
| 10″ | 1377 | 1377 | 1384 | 303 | 359 | 1980 | 10″ | 1467 | 1467 | 1472 | 303 | 359 | 2178 | |
| 12″ | 1467 | 1467 | 1472 | 330 | 378 | 2347 | 12″ | 1689 | 1689 | 1694 | 345 | 398 | 2963 | |
| 14″ | 1556 | 1556 | 1561 | 360 | 414 | 2974 | 14″ | 1801 | 1801 | 1817 | 358 | 410 | 3263 | |
| 16″ | 1734 | 1734 | 1740 | 401 | 455 | 4385 | 16″ | 1878 | 1878 | 1995 | 407 | 458 | 4556 | |
| 18″ | 1911 | 1911 | 1916 | 449 | 503 | 5775 | 18″ | 2133 | 2133 | 2156 | 452 | 502 | 6259 | |
| 20″ | 2090 | 2090 | 2100 | 485 | 543 | 7445 | 20″ | 2312 | 2312 | 2335 | 498 | 553 | 8182 | |
| 24″ | 2445 | 2445 | 2462 | 584 | 646 | 12269 | 24″ | 2711 | 2711 | 2744 | 597 | 664 | 14236 | |
ASME CL1500/2500
| SIZE (in.) | A | B | C | W.T (Ibs) | SIZE (in.) | A | B | C | W.T (Ibs) | |||||
| RF | BW | RTJ | RF | BW | RTJ | |||||||||
| 2″ | 644 | 644 | 649 | 105 | 129 | 128 | 2″ | 789 | 789 | 795 | 144 | 177 | 363 | |
| 3″ | 823 | 823 | 828 | 147 | 164 | 264 | 3″ | 1012 | 1012 | 1022 | 187 | 203 | 616 | |
| 4″ | 956 | 956 | 961 | 165 | 184 | 440 | 4″ | 1178 | 1178 | 1195 | 250 | 271 | 783 | |
| 6″ | 1234 | 1234 | 1244 | 260 | 280 | 1089 | 6″ | 1600 | 1600 | 1622 | 280 | 300 | 1760 | |
| 8″ | 1456 | 1456 | 1472 | 283 | 332 | 1738 | 8″ | 1789 | 1789 | 1817 | 475 | 485 | 6754 | |
| 10″ | 1734 | 1734 | 1750 | 349 | 399 | 2970 | 10″ | 2223 | 2223 | 2261 | 502 | 505 | 7885 | |
| 12″ | 1978 | 1978 | 2006 | 387 | 431 | 4310 | 12″ | 2489 | 2489 | 2529 | 514 | 547 | 9900 | |
| 14″ | 2200 | 2200 | 2233 | 421 | 482 | 5760 | ||||||||
| 16″ | 2422 | 2422 | 2462 | 274 | 540 | 7995 | ||||||||
| 18″ | 2690 | 2690 | 2728 | 570 | 628 | 12602 | ||||||||
| 20″ | 2912 | 2912 | 2951 | 690 | 725 | 18885 | ||||||||
| 24″ | 3400 | 3400 | 3451 | 733 | 780 | 30006 | ||||||||
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Additional General Insights Here
Specs of DDB Valve
Flow Efficiency
The DBB Valve is engineered to ensure minimal pressure loss, enhancing overall system efficiency. This design allows for smooth fluid flow with reduced turbulence. At NTVAL, the result is optimized performance and reduced energy consumption, making the valve an economical choice for long-term use. Efficient flow dynamics contribute to the reliability of the valve in various applications.
Bore Options
The DBB Valve is available in both full bore and reduced bore configurations. Full bore valves allow for maximum flow capacity, minimizing flow resistance and pressure drop. Reduced bore valves are suitable for applications where flow control is critical. These options provide flexibility to match specific project requirements.
Temperature Resilience
The DBB Valve is designed to perform reliably across a wide temperature range, from -50°C to 400°C. This resilience ensures that the valve can be used in various extreme temperature conditions without compromising performance. Such versatility makes the valve suitable for numerous industrial applications, from cryogenic services to high-temperature processes.
Features of DBB Valves
Double Block and Bleed Design
The DBB Valves feature a double block and bleed design with double fixed balls hinged on supports. This guarantees enhanced isolation and safety during operations. The floating metal or soft seats provide a secure seal, minimizing leakage. This design makes the valves highly reliable for critical applications.
Low-Pressure Loss
These DBB Valves are engineered for minimal pressure loss. For instance, the valve design allows for smooth flow of fluids with reduced turbulence. This feature enhances the overall efficiency of the system. Low pressure loss enhances optimal performance in various applications.
Anti-Corrosion Materials
Constructed with materials that meet NACE MR 0175 standards, these valves use carbon steel, stainless steel, and Duplex steel for corrosive environments, as well as Chrome-Molybdenum alloy steel for high-temperature service. These materials provide longevity and reliability in demanding conditions. Their resistance to corrosion and wear reduces maintenance needs and downtime.
Benefits of DBB Valves
Enhanced Safety
The double block and bleed design offers superior isolation, establishing enhanced safety during maintenance and operations. Similarly, this minimizes the risk of leaks and contamination. NTVAL suggests that reliable sealing provided by floating seats guarantees operational integrity. Safety is crucial in every valve produced.
Increased Efficiency
These DBB Valves are designed for low pressure loss, leading to increased system efficiency. Smooth fluid flow reduces energy consumption and operational costs, making the valves an economical choice for long-term use. Efficiency is a fundamental aspect of their design.
Durability in Harsh Conditions
The use of anti-corrosion materials and various steel options makes sure that the DBB Valves are durable even in the harshest environments. Whether dealing with corrosive substances or high temperatures, the valves maintain their integrity. I know you will agree that this leads to reduced maintenance and replacement costs.
Application of DDB Valve
Petrochemical Applications
In petrochemical plants, DBB Valves are used for safe and efficient flow control. For instance, they provide reliable isolation, enhancing the safety of both personnel and equipment. The valves’ ability to handle high pressures and corrosive environments makes them ideal for this sector. These DBB Valves help maintain smooth operations in complex petrochemical processes.
O.P.G & Nuclear
In O.P.G (oil, power, and gas) and nuclear facilities, DBB Valves provide crucial flow isolation and safety. Designed to handle extreme pressures and temperatures, they prevent leaks and help maintain safe, efficient operations in power plants and reactors.
Steam and Boiling Systems
In steam and boiling systems, DBB Valves guarantee precise control and safety. They are designed to withstand high temperatures and pressures typical in these applications. The valves’ reliable sealing prevents leaks and maintains system efficiency. As a matter of fact, these DBB Valves are essential for the smooth operation of steam and boiling systems.
Water and Sewage Systems
DBB Valves are crucial in water and sewage systems, providing effective flow control and isolation. They help prevent contamination and guarantee the integrity of the water supply. At NTVAL, the anti-corrosion materials used in these valves make them perfect for handling treated and untreated water. These valves contribute to reliable and safe water management.
4 Considerations When Buying a DBB Valve
01
Pressure Rating Up to ASME Class 2500
When selecting a DBB Valve, it’s crucial to consider the pressure and temperature ratings. Make sure the valve can operate within the required pressure range, typically from ASME Class 150 to ASME Class 2500. Additionally, confirm the valve’s temperature tolerance, ensuring it can function reliably in the expected operating environment.
02
Material Compatibility with NACE MR 0175 Standard
Evaluate the material compatibility of the DBB Valve with the intended application. For corrosive environments, materials like stainless steel or Duplex steel are ideal, while Chrome-Molybdenum alloy steel is better suited for high-temperature services. Verify that the materials comply with standards such as NACE MR 0175 for anti-corrosion properties.
03
End Connections of Up to 24 Inches
Consider the types of end connections available for the DBB Valve to guarantee compatibility with your system. Common options include RF/RTJ flanges, butt weld, clamp connection, and socket welding. NTVAL suggests that selecting the appropriate end connection facilitates easy integration and secure attachment, reducing the risk of leaks and enhancing overall system integrity.
04
Leakage Rate A to F
Assess the DBB Valve’s design features, such as the double block and bleed mechanism and the type of seats used. Valves with double fixed balls and floating metal or soft seats provide superior isolation and leak prevention. Additionally, look for features that minimize pressure loss, enhancing efficient fluid flow. These design considerations contribute to the valve’s performance and reliability in critical applications.
Frequently Asked Questions
Yes, DBB Valves have obtained ISO 14001 and ISO 45001 certifications, ensuring compliance with environmental and safety regulations.
A comprehensive quality control system is implemented, encompassing various stages of production, testing, and inspection to guarantee the reliability, durability, and performance of the valves.
At NTVAL, the general guarantee period is 18 months from the delivery date.
Technical assistance is available to troubleshoot issues, offer guidance on valve operation, and provide solutions to any problems encountered. We can send parts or a new valve for replacement. Customers can avail of repairs or replacements within the warranty period.
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