YF 8655 Series Electric Stop/Ratio Valve
The Young & Franklin 8655 Series Electric Stop/Ratio Valves are designed to regulate fuel pressure and provide rapid fuel shutoff capability. Fail Safe to closed position is accomplished by the use of two torsion springs. The actuator is suitable for fuel modules in Class 1 Div 2 Hazardous Locations.
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| Line Size | 4″ Valve | 6″ Valve | 8″ Valve | ||||||
| Flow Profile | Equal Percentage | ||||||||
| Rated Cg (Class IV / Class VI) | 10,400 / 11,200 | 18,400 / 19,700 | 27,900 / 30,600 | ||||||
| Estimated Dry Weight | 260 lbs. (118.2 kg) | 330 lbs. (150 kg) | 450 lbs. (204.5 kg) | ||||||
| Slew Time | ≤ 250 ms | ||||||||
| Trip Time | ≤ 200 ms | ||||||||
| Max Gas Fuel Temperature | Metal Seat: +450°F (+232°C) Composite Seat: +300°F (+148.9°C) | ||||||||
| Maximum Operating Pressure | Metal Seat: 680 psig (46.88 barg) Composite Seat: 730 psig (50.33 barg) | ||||||||
| Valve Flange Size | ASME B 16.5 Class 300 Flange | ||||||||
| Ambient Temperature Range | -4°F to 212°F (-20°C to 100°C) | ||||||||
| Mean Time Between Service- Valve | 32,000 Hours | ||||||||
| Mean Time Between Service- Actuator | 128,000 Hours | ||||||||
| Valve Materials | Carbon Steel (NACE Compliant) | ||||||||
| Bandwidth/Frequency Response | Customizable up to 23 Hz with 3dB attentuation | ||||||||
| Independent Feedback | 2 LVDTs (Optional) | ||||||||
| Motor Coil | Class F insulation (311°F, 155°C) | ||||||||
| LVDT Wiring | 6.56 ft (2 m) Flying Lead or MIL Connector | ||||||||
| Motor Wiring | 32.8 ft (10 m) Jacketed Cable | ||||||||
| Visual Position Indicator | Yes | ||||||||
| Ingress Protection | IP65 | ||||||||
| Stem Leakage | Zero Leakage, as shipped | ||||||||
| Failure Mode | Spring to drive valve to Safe position (Fail Close) | ||||||||
| Environmental | MIL-STD-810 – Shock and Vibration | ||||||||
| Command | 4-20 mA Position, -8 to +8 mA Triple Redundant Velocity | ||||||||
| Leakage Classification | ANSI FCI 70-2 Class IV (Metal Seat), Class VI (Composite Seat) | ||||||||
| Certifications | Class 1 Div 2, Group B, C & D, T3 | ||||||||