Marine Butterfly Valve V Type JIS 5K/10K - China Suppliers & Factory for Efficient Marine Pipeline Solutions
| Pressure test | 5K | 10K | |
| Shell | 7.5bar | 15bar | |
| Seal | Water | 5.5bar | 11bar |
| Air | 6bar | 6bar | |
| Working Temperature | -20~120℃ | ||
| No. | Part Name | Materials | |
|---|---|---|---|
| 1 | Body | DI | |
| 2 | Bottom shaft | SS410 | |
| 3 | Disc | CF8 | |
| 4 | Upper shaft | SS410 | |
| 5 | Seat | EPDM | |
| 6 | Bushing | Polymer | |
| 7 | O ring | EPDM | |
| 8 | Wormgear | DI | |
| DN | L | A | B | ∅E | ∅F | n-∅d1 | 5K | 10K | ||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| ØD | ØD1 | n-Ød | ∅D | ∅D1 | N-∅d | |||||||
| 50 | 40 | 130 | 83 | 65 | 50 | 4-∅8 | 130 | 105 | 4-15 | 155 | 120 | 4-19 |
| 65 | 40 | 140 | 93 | 65 | 50 | 4-∅8 | 155 | 130 | 4-15 | 175 | 140 | 4-19 |
| 80 | 60 | 149 | 100 | 65 | 50 | 4-∅8 | 180 | 145 | 4-19 | 185 | 150 | 8-19 |
| 100 | 60 | 156 | 110 | 90 | 70 | 4-∅10 | 200 | 165 | 8-19 | 210 | 175 | 8-19 |
| 125 | 60 | 177 | 125 | 90 | 70 | 4-∅10 | 235 | 200 | 8-19 | 250 | 210 | 8-23 |
| 150 | 70 | 200 | 143 | 90 | 70 | 4-∅10 | 265 | 230 | 8-19 | 280 | 240 | 8-23 |
| 200 | 80 | 225 | 170 | 125 | 102 | 4-∅12 | 320 | 280 | 8-23 | 330 | 290 | 12-23 |
| 250 | 90 | 280 | 203 | 125 | 102 | 4-∅12 | 385 | 345 | 12-23 | 400 | 355 | 12-25 |
| 300 | 90 | 309 | 230 | 125 | 102 | 4-∅12 | 430 | 390 | 12-23 | 445 | 400 | 16-25 |
| 350 | 100 | 325 | 260 | 125 | 102 | 4-∅12 | 480 | 435 | 12-25 | 490 | 445 | 16-25 |
| 400 | 110 | 371 | 290 | 175 | 140 | 4-∅18 | 540 | 495 | 16-25 | 560 | 510 | 16-27 |
| 450 | 130 | 392 | 330 | 175 | 140 | 4-∅18 | 605 | 555 | 16-25 | 620 | 565 | 20-27 |
| 500 | 140 | 431 | 358 | 175 | 140 | 4-∅18 | 655 | 605 | 20-25 | 675 | 620 | 20-27 |
Typical Marine Application Scenarios
1. Ballast Water System
As one of the most widely applied scenarios, the ballast water system transports sediment-laden seawater under normal temperature and low pressure. Concentric wafer-type soft seal butterfly valves with EPDM seals and 316L stainless steel or ductile iron valve bodies are primarily adopted to balance cost, corrosion resistance and sealing performance. Large-diameter main pipelines are equipped with double eccentric butterfly valves for enhanced stability.
2. Seawater and Fresh Water Cooling System
Affected by strong seawater corrosion and medium pressure, this system mainly uses double eccentric soft seal butterfly valves with aluminum bronze or 316L stainless steel valve bodies to ensure long-term stable heat exchange and cooling efficiency.
3. Bilge and Sewage System
Facing media containing oil stains and impurities, the system adopts concentric soft seal butterfly valves with oil-resistant NBR/EPDM seals, featuring good anti-fouling performance and convenient daily maintenance.
4. Marine Fire-fighting System
Requiring rapid emergency switching and reliable tightness, flange-type soft seal butterfly valves with epoxy-coated ductile iron are applied to resist pipeline vibration and ensure safe and efficient water supply in emergency situations.
5. Fuel and Lubricating Oil System
For flammable and explosive oil media, double eccentric metal hard seal or FKM soft seal butterfly valves are selected to meet fireproof, high-temperature resistant and safe cut-off requirements.
6. Ventilation and HVAC System
Lightweight concentric wafer-type butterfly valves are widely used for air volume regulation and pipeline isolation, thanks to their low flow resistance and space-saving installation advantages.
7. Special Extreme Working Conditions
Triple eccentric metal hard seal butterfly valves are applied to high-temperature flue gas and desulfurization systems, while food-grade sanitary butterfly valves are used for ship domestic fresh water systems to meet hygiene standards.
Q1: What is the pressure rating of the shell and seal for 5K and 10K specifications?
For 5K ratings, the shell test pressure is 7.5 bar, and the seal test pressure is 5.5 bar (water) and 6 bar (air). For 10K ratings, the shell test pressure is 15 bar, and the seal test pressure is 11 bar (water) and 6 bar (air).
Q2: What are the standard materials used for the body and seal of these valves?
The standard construction features a Ductile Iron (DI) body, a CF8 disc, SS410 upper and bottom shafts, and EPDM for the seat and O-ring materials.
Q3: What is the working temperature range for these marine butterfly valves?
The valves are designed to operate safely within a temperature range of -20℃ to 120℃, making them suitable for various marine applications.
Q4: Which valves are recommended for ballast water and cooling systems?
Concentric wafer-type soft seal EPDM butterfly valves are commonly used for ballast water systems. For seawater cooling systems, double eccentric soft seal butterfly valves with aluminum bronze or 316L stainless steel bodies are preferred to resist corrosion.
Q5: How are fuel and lubricating oil systems handled differently in marine piping?
Due to the flammable and explosive nature of oil media, these systems select double eccentric metal hard seal or FKM soft seal butterfly valves to satisfy fireproof and high-temperature safety requirements.