1FA01134-2

SELECTOR VALVE
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About this product
The 1FA01134‑2 selector valve is a hydraulically actuated bypass/selector unit used in the landing gear extension and retraction system of commercial aircraft. Installed within the gear hydraulic manifold, it directs pressurized fluid to either the extend or retract side of the actuators, enabling smooth deployment and stowage of the landing gear. By providing positive isolation between the two circuits, this valve prevents simultaneous flow that could cause mechanical binding or inadvertent gear movement, ensuring reliable and safe gear operations.
1FA01134-2 Datasheet
UOM: EA
Stock Location: Dubai
Hazardous Item: Non-Hazardous Item
Life Limited Part: No
Lead Time: Stock
Certification: Dual Release
8130/EASA Eligible: Yes
PRODUCT DESCRIPTION

1FA01134-2

  • Precise Flow Direction Control: Ensures hydraulic fluid is routed exclusively to the selected gear function (extend or retract), preventing cross‑pressurization and system interference.

  • Built‑In Bypass Functionality: Incorporates a spring‑loaded bypass that opens under high differential pressure to maintain hydraulic flow and prevent actuator cavitation if the valve becomes blocked.

  • Redundant Sealing Architecture: Dual o‑ring and metal‑to‑metal seals provide fail‑safe isolation of extend and retract ports, minimizing leakage and enhancing system integrity.

  • Corrosion‑Resistant Materials: Constructed from stainless steel and anodized aluminum with aviation‑grade seal compounds to withstand exposure to hydraulic fluids and environmental contaminants.


  • Directing hydraulic fluid for landing gear extension on touchdown.

  • Routing fluid for gear retraction after takeoff.

  • Providing circuit isolation during gear transit to prevent unintended movement.

  • Allowing bypass flow to protect actuators during filter clogging or high‑pressure spikes.


  • How does the bypass feature protect the system?

If the valve becomes blocked or pressure spikes occur, the internal bypass opens to maintain fluid flow and prevent actuator cavitation.

  • What maintenance does the valve require?

Periodic inspection of seals, functional bench testing for correct shift pressure, and verification of bypass activation thresholds during scheduled overhauls.

  • How do I verify correct valve operation?

Perform a bench‑test shift procedure, applying pressure to verify switching at the specified set point and bypass activation at high differential pressures.


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