Complete Assembly of Aviation Fueling Hose Reel
Aviation fuel reels fall into two categories: those mounted on fixed apron fueling islands and those installed on tanker trucks. Both types feature explosion-proof, jet-fuel-resistant, anti-static, and high-pressure sealed designs. The system comprises five main sections: the reel frame assembly, the power retraction mechanism, the fluid flow assembly, safety components, and auxiliary accessories.
I. Reel Frame Assembly
Base Frame
Welded carbon steel or stainless steel frame; explosion-proof and corrosion-resistant; includes mounting flanges (compatible with vehicle or hydrant pit island interfaces), vibration-dampening pads, and grounding terminals.
Reel Drum (Cylinder)
Seamless steel drum with an anti-corrosion surface coating; features a central fluid-flow mandrel and bearing housings at both ends; equipped with outer guide discs to prevent hose misalignment.
Support Bearings
Dust-proof and corrosion-resistant rolling bearings designed to isolate sparks caused by metal-to-metal friction; equipped with grease nipples.
Rotating Fluid Mandrel (Central Swivel Joint)
Core sealing component; the fixed end connects to the inlet piping, while the rotating end turns with the drum; utilizes multi-layer fluororubber/PTFE seals to withstand high-pressure jet fuel and prevent leakage during hose extension or retraction; includes an integrated anti-static conductive path.
II. Automatic Retraction Power Mechanism
1. Spring-Retraction Type (Small Hydrant Pit Fueling Reels)
Constant-force spiral spring assembly, spring housing, and spring limit lock;
Ratchet locking mechanism: automatically locks when the hose is pulled to any length; unlocks and automatically retracts with a gentle tug.
2. Hydraulic/Pneumatic Motor Retraction (Large Tanker Truck Main Reels)
Explosion-proof hydraulic or pneumatic motor and reduction gearbox;
Directional control valve and buffer throttle valve to ensure smooth, low-speed hose retraction and prevent whipping or impact;
Emergency manual handwheel (for emergency retraction during power or air supply failure). 3. Limit Protection
Limit switches for hose retraction and extension; automatic motor/power cutoff upon reaching the retraction limit.
Overload protection/torque buffer device; absorbs force if the hose jams, preventing the hose from tearing.
III. Hydraulic Circuit and Filtration Components
Inlet Ball Valve / Emergency Shut-off Valve
Manual shut-off valve at the reel inlet; optional pneumatic emergency shut-off valve linked to fire and spill protection systems.
High-Pressure Aviation-Grade Hose
Multi-layer steel-wire reinforced, oil-resistant hose; inner layer compatible with Jet A-1 fuel; outer layer wear-resistant and aging-resistant; continuous electrical continuity along the hose length, with conductive bonding across metal end fittings.
Hose End Fittings
Inner end: Flange or quick-connect coupling for connection to the rotary mandrel.
Outer end: Dry-break coupling (standard aircraft refueling fitting) with an integrated self-sealing valve; automatically seals upon disconnection to prevent leakage.
Hose Guide / Guide Rollers
Wear-resistant guide roller at the reel outlet; minimizes hose friction and wear; prevents kinking or collapsing of the hose.
IV. Specialized Safety Components (Mandatory for Aviation Fuel Reels)
Static Protection System
Continuous electrical continuity across the unit: conductive rings in the rotary joint, conductive hose layers, and frame grounding clamps/terminals to eliminate static electricity generated by fluid flow.
Pressure Protection Components
Built-in micro-relief circuit for automatic pressure relief and recirculation during overpressure events; high-pressure seal rating ≥ 1.6 MPa.
Breakaway Protection Device (Critical Safety Component)
Breakaway valve at the hose end (dry-break breakaway coupling): Automatically separates when tension reaches a preset limit (e.g., due to accidental aircraft movement); both ends seal simultaneously to prevent pipeline rupture and fuel leakage.
Spill Sensing Interface
Integrated mounting point for a spill sensor; linked to the fuel supply system to cut off flow in the event of a spill.
Explosion Protection
Non-metallic isolation for all moving friction parts to prevent sparking; conductive bonding for metal components. V. Control, Monitoring, and Ancillary Accessories
Operating handle / Locking pedal
Manual release handle for spring-driven reels; Start/stop control button for motor-driven reels (explosion-proof type).
Markings and protective covers
Rainproof and dustproof metal housing; aviation fuel warning labels; high-pressure warning nameplates.
Maintenance components
Spare seals; lubrication ports; drain plugs; vent valves.
Auxiliary accessories
Static grounding clamp (for aircraft fuselage connection); hose hook; anti-abrasion sleeve.
Simplified functional breakdown (standard engineering classification)
Mechanical support and swivel unit: Frame, drum, swivel mandrel, bearings.
Retraction/deployment drive unit: Spring/pneumatic/hydraulic retraction mechanism; limit lock.
Fuel transfer unit: Swivel sealing mandrel; high-pressure aviation fuel hose; dry-break coupling.
Safety protection unit: Breakaway valve; static continuity; pressure relief; explosion-proof structure.
Installation and mounting unit: Base; housing; grounding assembly; operation and control components.
