Can hydraulic fittings be used for retraction and extension of aircraft landing gear?

Hydraulic fittings have important applications in the landing gear retraction system of aircraft. The following is a detailed introduction of the points:
1. Power transmission and execution
The hydraulic cylinder is the core executing fitting in the landing gear retraction system, which is pushed by the pressure of hydraulic oil to achieve the extension and retraction actions of the landing gear. Hydraulic cylinders can generate high thrust, meeting the high load requirements that aircraft landing gear needs to withstand.

2. Flow and pressure control
Hydraulic valves (such as directional valves, relief valves, throttle valves) control the flow direction, pressure, and flow rate of hydraulic oil, ensuring smooth, accurate, and safe landing gear movement. Especially the throttle valve can regulate the oil flow rate and achieve smooth control of the landing gear retraction speed.

3. Security protection function
Hydraulic fittings such as overflow valves and safety valves prevent excessive system pressure, protect the landing gear hydraulic system from damage, and prevent the landing gear from being unable to retract or retract properly due to overload or malfunction, ensuring flight safety.

4. Compact and lightweight design
Aircraft have strict limitations on weight and space, and hydraulic fittings are small in size and compact in structure, making them easy to integrate and install. At the same time, they can provide high power density, meeting the lightweight requirements of aircraft landing gear systems.

5. Strong environmental adaptability
The design of hydraulic fittings can adapt to extreme temperatures, vibrations, and pressure changes, ensuring that the landing gear system of the aircraft remains stable and reliable under different flight stages and environmental conditions.

6. Precise control
High performance hydraulic fittings such as servo valves and proportional valves can achieve precise adjustment of hydraulic oil flow and pressure, making the landing gear retraction and extension movements smoother and more accurate, reducing mechanical impact and noise.