Hydraulic Systems Flashcards
What does a single-acting actuator do?
Uses hydraulic pressure to move the piston in one direction
What does a double-acting actuator do?
Allows the piston to move in two directions
What do selector valves do?
- Operated by the pilot
- It directs fluid pressure to various parts of the system
What are the two types of pumps?
- Constant pressure pump
- Spur gear
Ways in which a pump can be driven are…
- Electrically
- Ram Air Turbine (RAT)
- Engine
- Hand
Functions of the reservoir
- Store XS fluid
- Allows thermal expansion
- Stack pipe to provide an emergency supply
What do accumulators do?
Store pressure energy using compressed nitrogen
Why do filters have a by-pass?
In case of a blockage
Relief valves
Vent excess pressure
Restrictor valves
Reduce flow speed
Priority valves
Maintain pressure in one part of the system
Shuttle valves
Supply a service from the highest power source
Fuse valve
To shut off a leaking part of the system
What is a PTU used for?
One hydraulic system can power the other as they are duplicated
What can indicate a leak in the system?
High temp or low pressure
