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Lee Shuttle Valves - Typical Application

Aircraft Landing Gear System

Port diagram

The requirement for this valve is commonly found in aircraft landing gear hydraulic systems shown in a typical circuit below.

Lee Shuttle Valves are designed to isolate the normal from the emergency hydraulic system during normal operation. When pressure is lost in the normal system and emergency pressure is applied, the poppet shuttles across to block the normal port allowing flow to the cylinder.

Emergency Landing Gear - Retracted