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Fuel Control Valve
Precision modulating fuel control valve for continuous burner firing-rate regulation in the AVL-DMP — the primary lever for energy efficiency and mix-temperature accuracy.
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At a glance
| Valve size | DN25–DN100 (1"–4") |
|---|---|
| Pressure rating | ANSI Class 150 / PN16 |
| Trim material | 316 SS plug, stellite-faced seat ring |
| Control signal | 4–20 mA proportional (standard) |
| Actuator supply | Electric 24/230 V AC or pneumatic 0.2–1.0 bar |
| Seat leakage class | ANSI/FCI 70-2 Class IV or better |
| Turndown ratio | 10:1 minimum |
| Cv range | 0.4–80 depending on size |
Overview
The fuel control valve is a motorised or pneumatically actuated modulating control valve installed in the main fuel supply line between the day tank and the AVL-DMP drum burner. Unlike the solenoid valves used elsewhere in the plant, the fuel control valve receives a proportional analogue signal (typically 4–20 mA from the PLC temperature control loop) and modulates its opening continuously across a wide flow range to match the burner's firing rate to the demanded drum outlet temperature.
The valve must perform accurately across a turndown ratio of at least 10:1 — from minimum stable flame at low aggregate throughput to maximum output at rated plant capacity — while operating in an environment of vibration, heat radiation from the burner, and exposure to diesel or heavy fuel oil (HFO). It is both a process control instrument and a combustion-safety component, and its specification must match the plant's burner type, fuel grade, and PLC control signal.
Function
Accurate fuel modulation is the single most important factor in simultaneous energy efficiency and mix quality in a drum mix plant. The valve's position at any instant determines the burner flame intensity, which in turn determines the rate of aggregate heating inside the drum. When aggregate feed rate, aggregate moisture content, or ambient temperature change — all of which happen continuously during a production shift — the PLC compares the actual drum outlet temperature to the setpoint and adjusts the fuel control valve position in real time. A valve with poor hysteresis, excessive deadband, or internal leakage causes the temperature control loop to hunt, producing cyclic mix temperature variation that shows up as binder viscosity inconsistency in the finished asphalt. Fuel valve internal leakage in the closed position is also a combustion-safety hazard, allowing uncontrolled fuel to reach the burner nozzle during shutdown sequences.
Construction & quality
Valve body in ASTM A216 WCB carbon steel (for HFO service) or ductile iron (diesel service), PN16 flanged to match the plant pipework. Globe-type trim with a precision-contoured plug in 316 stainless steel, hardened to HRC 38–42 and mated to a stellite-faced seat ring for erosion and cavitation resistance. Gland packing in flexible graphite braided rings with anti-blowout backup ring. Electric actuator (24 V DC or 230 V AC, accepting 4–20 mA command signal) with integral position feedback potentiometer, manual handwheel override, and travel stops. Pneumatic actuator option (supply 0.2–1.0 bar) available for plants with instrument-air systems. The actuator housing is IP67 rated and includes a NAMUR proximity switch for open/closed position indication back to the PLC. Fail-safe action (fail-closed for combustion safety) is standard.
When to replace
- Burner outlet temperature consistently overshoots or undershoots setpoint despite PLC control-loop re-tuning
- Actuator hunting — continuous rapid back-and-forth repositioning — on an otherwise stable temperature process
- Visible fuel oil leakage at stem packing gland, body flanges, or bonnet bolting
- Position feedback signal shows discrepancy between PLC command percentage and actual valve stem position
- Abnormal fuel consumption per tonne of mix produced, confirmed against the plant's energy monitoring log
Compatibility & fitment
Sized for burner thermal capacities from 200,000 kcal/h to 2,000,000 kcal/h (232–2,326 kW) across AVL-DMP plants from 40 TPH to 160 TPH; Avelta specifies body size, Cv value, trim characteristic (linear or equal-percentage), and actuator type to match the plant's existing burner manufacturer specification and PLC control output.
Why buy from Avelta
Avelta fuel control valves are bench-tested for flow coefficient accuracy, seat leakage, and actuator hysteresis before shipment, and the actuator is factory-mounted and signal-calibrated to the plant's 4–20 mA range so installation requires only pipework connection and cable termination — commissioning time on the burner control loop is minimised to a single setpoint verification.
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