Lesson 6: Accumulators and Actuators Flashcards
What component provides stored air pressure which gives hydraulic flow potential?
ACCUMULATOR
What is the purpose of and ACCUMULATOR?
dampen/absorb hydraulic surges
constant pressure
help pump under peak pressure
backup brakes
What are the types of ACCUMULATORS?
Piston
Bladder
Diaphragm
Metal Bellows
This type of accumulator has a free floating piston and must be charged with 1/3 or 1/2 the normal system fluid operating pressure
Piston Type
How does the Piston type work?
inlet fluid forces the piston down increasing AIR pressure which FORCES piston back UP to maintain system pressure
This type of accumulator uses a SYNTHETIC bladder that inflates with air pressure
BLADDER type
This type of accumulator uses a RUBBERIZED diaphragm to seprate air an hydraulic chambers
DIAPHRAGM type
The difference between the bladder/diaphragm and the piston is what?
Piston slides, the others FLEX
This type of accumulator is for very high pressure, does not corrode and is maintenance free
Metal Bellows type
There must be no ________ pressure on hydraulic side of accumulator when charging (pressurizing) the accumulator with a gas
hydraulic system psi
Purpose of an Schrader Valve?
pressurize and depressurize
What is the first thing you do when charging an accumulator?
MM for pressure, gas, caution, procedure
Safety wise, what should you make sure of?
Calibration sticker current
Correct regulator
Closed both valves
Correct gas
What component does the work?
Actuators
What are the 2 types of actuators?
Linear and Rotary
What are the 3 type of LINEAR actuators?
Single
Double unbalanced
Double balanced
This type of actuator has its piston only moving in one direction and returned by a spring
SINGLE acting
Double acting Unbalanced actuators are commonly used for what?
Flight Controls and Landing Gear
This type of actuator is used when equal force is required such as flight control actuators and auto pilot servos
Double Acting Balanced
Cushioned Gear Type Actuators do what?
Cushions and Slows
What is specific to the Lock Type Actuator?
Locking pin and ball
2 types of Rotary actuators?
Rack and pinion
Hydraulic motor
Rack and pinion types are used for what?
small aircraft landing gear
This type of actuator we use where continuous rotational force is required such as PDU AND PTUs
Hydraulic Motor
How does the Hydraulic Motor actuator work?
piston down = shaft rotate
How can we verify INTERNAL actuator leaks?
leaky actuator hot
NDT
pressure decay
shop bench test
