18061659285
Forged Trunnion Mounted Twin-Ball DBB Ball Valve with Dual Worm Gear Operation
Product Parameters
Product Name |
Forged Trunnion Mounted Twin-Ball DBB Ball Valve with Dual Worm Gear Operation |
Valve Type |
Integrated Twin-Ball Double Block and Bleed Ball Valve |
Ball Design |
Trunnion Mounted Fixed Ball Design |
Structure |
Two Independent Trunnion Mounted Ball Closures with Intermediate Bleed / Drain Connection |
Size Range |
2"–24" / DN50–DN600, larger sizes available by project design |
Pressure Rating |
ASME Class 150 / 300 / 600 / 900 / 1500 / 2500, depending on size and design |
Bore Type |
Full Bore / Reduced Bore optional |
End Connection |
RF / RTJ Flanged, Butt Welded Ends optional |
Body Material |
ASTM A105N, A350 LF2, A182 F304/F316, A182 F51/F53, A182 F11/F22 optional |
Seat Material |
PTFE, RPTFE, PEEK, Devlon, Metal Seat optional |
Operation |
Dual Worm Gear Operation, Electric / Pneumatic / Hydraulic Actuator optional |
Temperature Range |
-46°C to +200°C for soft seated design; up to +425°C for metal seated design, depending on material, seat and sealing configuration |
Design Standard |
API 6D, ASME B16.34 available by project requirement |
Test Standard |
API 6D / API 598 / ISO 5208 available |
Application |
Oil & Gas, Refinery, Petrochemical, Metering Stations and Critical Pipeline Isolation |
Brand |
SLVCN |
Key Features
Trunnion Mounted Twin-Ball Design
Two independent trunnion mounted ball closures are integrated into one valve body, helping provide reliable upstream and downstream isolation for critical pipeline applications.
Intermediate Bleed / Drain Function
The intermediate bleed / drain connection allows cavity pressure release, draining and leakage verification before maintenance, inspection or system intervention.
Lower Torque Under Pressure
The fixed ball structure supports each ball under pressure, helping reduce operating torque and improve sealing stability in larger-size or higher-pressure applications.
Dual Worm Gear Operation
Two independent worm gear operators provide smooth manual control of both ball closures, especially for larger sizes or higher torque service conditions.
Compact Integrated DBB Body
Compared with a traditional two-block-valves-plus-one-bleed-valve assembly, the integrated body design helps reduce installation space, connection points and potential external leak paths.
Flexible Project Configuration
Seat material, body material, pressure class, end connection, bore type, bleed arrangement, operation method and testing requirements can be customized according to actual working conditions.
Product Details
SLVCN Forged Trunnion Mounted Twin-Ball DBB Ball Valve with Dual Worm Gear Operation is designed for oil & gas, refinery, petrochemical, metering station and critical pipeline isolation applications where reliable shut-off, cavity pressure release and leakage verification are required.
The valve integrates two independent trunnion mounted ball closures and an intermediate bleed / drain connection within one compact body. When both ball closures are closed, the cavity between the two balls can be vented, drained or monitored through the bleed connection, allowing operators to verify isolation performance before maintenance, inspection or process line intervention.
Compared with a traditional assembly using two separate block valves and one bleed valve, the integrated DBB design helps reduce installation space, connection points, overall weight and potential external leak paths.
The trunnion mounted fixed ball structure supports the balls under pressure, helping reduce operating torque and improve sealing stability in larger-size or higher-pressure pipeline service. Dual worm gear operators provide smooth and independent manual control of both ball closures.
Soft seated and metal seated configurations are available according to medium, pressure, temperature and leakage requirements. Body material, seat material, pressure class, end connection, bore type, bleed arrangement, operation method and testing requirements can be customized according to project specifications.
| 1 | Right Body | 8 | Gasket | 15 | Seat Retainer | 22 | Key | 29 | Packing | 36 | Stem Bearing |
| 2 | Nut | 9 | "O"-Ring | 16 | Spring | 23 | Bolt | 30 | "O"-Ring | 37 | "O"-Ring |
| 3 | Stud | 10 | Spring | 17 | Packing | 24 | Pin | 31 | Thrust Washer | 38 | Gasket |
| 4 | "O"-Ring | 11 | Seat Retainer | 18 | "O"-Ring | 25 | Connection Plate | 32 | Stem Bearing | 39 | Lower Cover |
| 5 | "O"-Ring | 12 | Seat | 19 | Thrust Washer | 26 | Nut | 33 | Thrust Washer | 40 | Bolt |
| 6 | Thrust Washer | 13 | Ball | 20 | "O"-Ring | 27 | Bolt | 34 | Stem | 41 | Drain Valve |
| 7 | Packing | 14 | Seat | 21 | Worm-Gear | 28 | Packing Box | 35 | Body |
Decades of Expertise
Tailored Solutions
Rigorous Quality Control
Proven Reliability
How We Ensure Quality & Reliability?
Quality is built into every stage - from raw material to final testing.
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