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Lee Shuttle Valves
Styles and Datasheets

Miniature Insert Fits in the Head of an Actuator
Eliminates Common Mode Failures
Non-interflow Design
No Elastomeric Seals Required
Low Leakage or Zero Leakage

The Lee Shuttle Valve is offered in four configurations. One type is the spring biased shuttle valve with the emergency port normally closed. Another type is the detented shuttle valve where the poppet latches to close off either the emergency port or the normal port. Also there are selective shuttle valves with a non-biased, loose ball design. Finally there are inverse shuttle valves where the lower pressure inlet port is open to the common port instead of the higher pressure inlet port.

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. Lee Spring Biased and Detented Shuttle Valves are of the "non-interflow" type, which means the normal port closes before the emergency port opens. At no time are all 3 ports open simultaneously. The interflow leak is limited to less than 3 mL per cycle permitted by MIL-V-19068. The requirement for this valve is commonly found in aircraft landing gear hydraulic systems shown in a typical circuit below.

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Lee Shuttle Valves are miniature inserts that are so small, they fit right in the head of an actuator. This saves space and weight, and protects them from external physical damage. With direct communication from the "S" port into the actuator, without external plumbing, common mode failures are virtually eliminated.

As with all Lee inserts, they require no O-rings or elastomeric seals. Since the shuttle valve is a three port insert, an additional seal beyond the normal locking end is required. The "nose seal" works in the same manner as a locking end except a tapered section of the insert body acts as the tapered pin. The nose seal rests on a 45½ shoulder and is expanded as the body is pressed down into the installation hole.

Some sizes of the spring biased shuttle valves are available with filter screens which prevent large contaminants generated in the actuator from getting into the valve or the hydraulic system.

Datasheets

Spring Biased Shuttle Valves

Lee Spring Biased Shuttle Valves can be used to reduce the flow required to extend a large unequal area actuator, where reduced actuation force may be permissible in one direction......

Ų.187" Shuttle Valve - Spring Biased

Ų.281" Shuttle Valve - Spring Biased

Ų.281" Shuttle Valve - Screened Spring Biased

Ų.500" Shuttle Valve - Spring Biased

Ų.187" High Pressure Shuttle Valve - Spring Biased

Ų.281" High Pressure Shuttle Valve - Spring Biased

Ų.500" High Pressure Shuttle Valve - Spring Biased

Detented Shuttle Valves

Lee Detented Shuttle Valves are intended for use in systems where bidirectional flow is required between the "S" and "E" ports, such as in most brake circuits.......

Ų.281" Shuttle Valve - Detented

Ų.500" Shuttle Valve - Detented

Ų.281" Shuttle Valve - Zero Leak Detented

Ų.500" Shuttle Valve - Zero Leak Detented

Selective Shuttle Valves

Lee Selective Shuttle Valves are a non-biased, loose-ball design and provide a simple "A" or "B" logic.

Ų.187" Shuttle Valve - Selective

Ų.250" Shuttle Valve - Selective

Ų.500" Shuttle Valve - Selective

Inverse Shuttle Valves

The Lee Inverse Shuttle Valve operates in a manner opposite to that of a Spring Biased Shuttle Valve. Rather than sensing and allowing the higher pressure side to flow, it selects the lower pressure and allows it to flow instead.....

Ų.500" Shuttle Valve - Inverse

For more information, please send us your application information via our ASK LEE service. Or contact our application engineers in the USA at 1-800-LEE-PLUG or our representatives around the world.
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