Aviation Dry-Break Quick Disconnect type 344GF | Cla-Val

Cla-Val 344GF Dry-Break Quick Disconnect

The Cla-Val 344GF is a dry-break quick disconnect coupling designed for aviation fuel hose or pantograph assemblies. It is installed between the delivery hose and refueling nozzle, enabling removal of the nozzle or strainer for inspection or maintenance without requiring full line drainage.

Isolation Function

During disconnection, the male adapter is released only when both spring-loaded latches are actuated and the spring sleeve is retracted. Disconnection automatically closes the internal valve in the female half, isolating fuel flow from the hose or pantograph. Upon reconnection, the valve reopens automatically. This mechanism minimizes fuel spillage and exposure during maintenance.

Construction

• Body: Hard-anodized aluminum for corrosion resistance
• Internal components: Stainless steel
• Internal butterfly-type shutoff valve in female half
• Hydrostatic test rating: up to 300 psi for refueling hose assemblies
• Dual latch system for mechanical interlock prior to disconnection

The butterfly geometry reduces pressure drop in the open position and provides positive mechanical shutoff when disconnected. This is critical for nozzle replacement, strainer inspection, or isolation of hose-end components under operational conditions.

Typical Applications

• Airport hydrant dispensers
• Refuellers and pantograph systems
• Underwing pressure refueling
• Service points upstream of Cla-Val 341GF or 347GF nozzles
• Jet A-1 lines requiring fuel containment during disconnection

Selection Criteria

Selection of the 344GF should consider:

• Diameter and connection type of hose-end assembly
• Compatibility with nozzle and strainer interfaces
• Hydrostatic test requirements of the hose
• Available handling space on pantograph or refueller
• Maintenance and disconnection procedures under operational conditions

FAQ

What closes during disconnection?
The internal butterfly valve in the female half closes, isolating flow from the hose or pantograph.

Why is it used upstream of the refueling nozzle?
It allows removal of the nozzle or strainer for inspection without depressurizing or draining the entire delivery hose.