18061659285
Fully Welded Trunnion-Mounted Ball Valve with Extended Stem for Underground Pipelines
Product Parameters
| Size | 2" to 64" (DN50–DN1600) |
| Pressure | Class 300 (Optional Class 150/600/900/1500) |
| Operating Temperature | -46℃ to 450℃ (Material Dependent) |
| Ball Type | Trunnion-mounted, Fully Welded One-Piece Body |
| Sealing Design | Double Block-and-Bleed (DBB) with optional emergency sealant injection |
| End Connection | Butt Weld (BW) / Socket Weld (SW) |
| Operation Types | Manual Handle, Worm Gear, Electric, Pneumatic |
| Stem Type | Extended Stem for Buried / Underground Service |
| Mounting | ISO 5211 Direct Mounting Available |
| Body Materials | Carbon Steel, Low Temperature Steel, Stainless Steel, Duplex/Alloy Steel (ASTM A182, A694, Inconel 625, Incoloy 800, Hastelloy C, etc.) |
| Seat Materials | PEEK, PCTFE (KEL-F), Devlon V-API, Hard-Seated Options |
| Design & Manufacturing Standards | API 6D, ASME B16.34, BS 5351, MESC SPET 7/200 |
| Application Field | Oil & Gas, Chemical & Petrochemical, Power Generation, Offshore & Deepwater, Aerospace & Military, Water Treatment & Supply, Metallurgical & Mining |
| Brand | SLVCN |
Key Features
Extended stem for buried service
Enables reliable operation in underground or buried installations, even if stem seals fail.
Leak-resistant welded body
Fully welded one-piece construction minimizes leakage points for long-term medium-pressure pipeline reliability.
Low-torque operation
Trunnion-mounted design absorbs line pressure, ensuring smooth valve operation at full rated pressure.
Safe isolation and venting
Double block-and-bleed (DBB) design allows controlled venting and secure pipeline isolation during maintenance or emergencies.
Enhanced safety features
Anti-blowout stem, anti-static device, and fire-safe seats protect against critical and flammable conditions.
Flexible material options
Body, seat, and sealing materials can be tailored for various media, temperatures, and project requirements.
Product Details
SLVCN Class 300 Fully Welded Trunnion-Mounted DBB Ball Valve with Extended Stem provides reliable flow control for underground, buried, and harsh pipeline applications. Its fully welded one-piece body eliminates flange leakage points for long-term operation in medium-pressure pipelines.
The trunnion-mounted DBB design ensures stable operation, safe isolation, and easy venting during maintenance or emergencies. The extended stem allows buried installation operation even if stem seals fail.
Safety features include fire-safe spring-loaded seats, anti-static protection, and an anti-blowout stem. Body, seat, and sealing materials can be customized - including Carbon Steel, Stainless Steel, Alloy Steel, PEEK, and PCTFE - to meet specific temperatures, pressures, and media requirements.
| 1 | Welding steel pipe | 10 | Seat | 19 | Seal Ring | 28 | Nut | 37 | Four Open Loop |
| 2 | Seamless steel tube | 11 | Seat | 20 | Extension Stem | 29 | Bolt | 38 | Sealing Ring |
| 3 | Right Body | 12 | Ball | 21 | Bearing | 30 | Packing | 39 | Thrust Washer |
| 4 | Spring | 13 | Trunnion Support | 22 | Extension Support | 31 | Thrust Washer | 40 | Stem Bearing |
| 5 | "O"-Ring | 14 | Worm-Gear | 23 | Pin | 32 | "O"-Ring | 41 | Stem |
| 6 | "O"-Ring | 15 | Key | 24 | Support Frame | 33 | Packing Box | 42 | Stem Bearing |
| 7 | Thrust Washer | 16 | Bolt | 25 | Key | 34 | Gasket | 43 | Body |
| 8 | Packing | 17 | "O"-Ring | 26 | Connection Plate | 35 | "O"-Ring | 44 | Thrust Bearing |
| 9 | Seat Retainer | 18 | "O"-Ring | 27 | Stud | 36 | Stem Bearing | 45 | Stem Bearing |
Parts List
Dimensions: Class 300 - Full Port
| Size | Bore | Model / Face to Face | D in/mm | D1 in/mm | Weight | ||||
| NPS/DN | B1in/mm | B2 in/mm | FF,FW RF in/mm | FF,FW RTJ in/mm | FF BWE in/mm | FW BWE in/mm | Model FW lb/kg | ||
| 2" | 1.94 | 1.94 | 8.5 | 9.13 | 8.5 | 11 | 6.5 | 6.5 | 60 |
| 50 | 49 | 49 | 216 | 232 | 216 | 279 | 166 | 166 | 27 |
| 3" | 2.94 | 2.94 | 11,13 | 11.75 | 11.13 | 12.5 | 8.5 | 8.5 | 132 |
| 80 | 74 | 74 | 283 | 298 | 283 | 318 | 216 | 216 | 60 |
| 4" | 3.94 | 3.94 | 12 | 12.63 | 12 | 14 | 10.1 | 10.1 | 179 |
| 100 | 100 | 100 | 305 | 321 | 305 | 356 | 256 | 256 | 81 |
| 6" | 5.94 | 5.94 | 15.88 | 16.5 | 18 | 18 | 12.9 | 12.9 | 397 |
| 150 | 150 | 150 | 403 | 419 | 457 | 457 | 328 | 328 | 180 |
| 8" | 7.94 | 7.94 | 19.75 | 20.38 | 20.5 | 21.5 | 16.3 | 15.9 | 659 |
Weight and dimensions for larger valve sizes up to 64" available on request
Dimensions: Class 300 - Reduced Port
| Size | Bore | Model / Face to Face | D in/mm | D1 in/mm | Weight | ||||
| NPS/DN | B1in/mm | B2 in/mm | GG, GW RF in/mm | GG, GW RTJ in/mm | GG BWE in/mm | GW BWE in/mm | Model GW lb/kg | ||
| 2"X 11/2" | 1.94 | 1.5 | 11.5 | 11.63 | 11.5 | 11 | 6.5 | 6.5 | 68 |
| 50X40 | 49 | 38 | 292 | 295 | 292 | 279 | 166 | 166 | 31 |
| 3"X2" | 2.94 | 1.94 | 14 | 14.13 | 14 | 12.5 | 8.3 | 8.3 | 110 |
| 80X50 | 74 | 49 | 356 | 359 | 356 | 318 | 211 | 211 | 50 |
| 4"X3" | 3.94 | 2.94 | 17 | 17.13 | 17 | 14 | 10.9 | 10.9 | 209 |
| 100X80 | 100 | 74 | 432 | 435 | 432 | 356 | 276 | 276 | 95 |
| 6"X4" | 5.94 | 3.94 | 22 | 22.13 | 22 | 18 | 14 | 14 | 386 |
| 150X100 | 150 | 100 | 559 | 562 | 559 | 457 | 356 | 356 | 175 |
| 8"X6" | 7.94 | 5.94 | 26 | 26,13 | 26 | 21.5 | 16.6 | 16.6 | 603 |
| 200X150 | 201 | 150 | 660 | 664 | 660 | 546 | 421 | 421 | 273 |
| 10"x8" | 9.94 | 7.94 | 31 | 31.13 | 31 | 23.5 | 20.1 | 20.1 | 1010 |
Weight and dimensions for larger valve sizes up to 64" available on request
If you want to obtain the complete size, please contact us
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