Restrictors Flashcards
It is a reduced passage area to reduce (restrict) the flow of fluid
Hydraulic Restrictors
Two types of Restrictors are:
Fixed Orifice
Variable Orifice(Restrictor)
Type of restrictor that orifice size cannot be adjusted?
Fixed orifice
Type of restrictor that an ADJUSTING SCREW allows the orifice size to be adjusted to change the flow rate.
Variable orifice
Check valves that are placed in a system to allow flow in only 1 direction, but may be opened manually, hydraulically or electrically to allow fluid to flow in either direction
Used for sequencing the operation of events for landing gear extension and retraction on larger aircraft
Sequence Valves or Phase control Valves
similar to pressure activated sequence valves except that they are used to ensure essential systems are given priority over non-essential systems
fluid will flow to the second system when the first system has completed its cycle and pressure increases
Priority Valves
Type of valve installed in hydraulic lines to prevent a loss of fluid and minimize air entry when maintenance is performed when lines are disconnected and components are removed
Quick-Disconnect valves
used to prevent an excessive loss of hydraulic fluid if a leak should occur downstream of fuse.
Shuts off hydraulic supply or FLOW is there is a leak
hydraulic Fuses
2 Types of Fuses
Pressure drop sensing - shuts off hydraulic flow if a sufficient pressure drop occurs across the fuse
VOLUME sensing - shuts off hydraulic supply if a specified volume of fluid flows through the fuse
How does a fuse reset?
It resets manually, by bleeding off header pressure or some are self-resetting.
used to provide an alternate route for fluid to travel when required (back-up or emergency operation)
piston shifts or “shuttles” in a chamber to direct fluid supply from source to the COMPONENT.
Shuttle Valves
used to shut off supply of hydraulic fluid downstream
Shut off valves
Application:
- Engine firewall shut-off
- maintenance isolation (lockout for safety)
- inlet to actuators (fly-by-wire)
Valves used to regulate or control the pressure in a hydraulic system.
Pressure Control
Types:
- RELIEF valves
- pressure REGULATORS
- pressure REDUCERS
A protection device used as a backup for main pressure regulator.
It also acts essentially like a high pressure-activated check valve
System Relief Valves
used to relieve excess pressure caused by thermal expansion in the system where check valves or selector valves trap fluids subjected to pressure changes.
smaller than pressure relief valvs
Thermal relief valves
