Hydraulic Devices
This hydraulic system will have all hydraulic components located in one unit.
What is a Power Pack?
This component allows fluid to freely flow in one direction while preventing fluid flow in the opposite direction.
What is a check valve?
Red in color, petroleum base, synthetic rubber seals.
What is MIL-H-5606?
This is the common cause of Chatter in a hydraulic system.
This valve prevents the flaps from being lowered at airspeeds which would impose excessive structural loads.
What is the flap overload valve?
This is the most commonly used seal to prevent internal and external leakage in both directions of a hydraulic unit.
What is an O-Ring seal?
This valve directs pressurized fluid to one end of an actuating cylinder while simultaneously directing return fluid to the reservoir from the other end.
What is a selector valve?
Light purple color, phosphate ester base, butyl rubber seals.
What is MIL-H-8446?
This device prevents hydraulic pump cavitation in a hydraulic system.
What is the pressurized reservoir?
This is a mechanical safety device in a gear type hydraulic pump which protects the pump from overload.
What is a shear pin?
This is a filter incorporating specially treated cellulose paper.
What is a Micronic filter?
This is the most commonly used selector valve in hydraulic systems to provide simultaneous flow both into and out of an actuating unit.
What is a four-port, closed center valve?
These are are the only desirable properties of a good hydraulic fluid that has chemical stability.
What are Low viscosity, high flash point, high fire point?
The threaded section is protected from damage during seal installation by doing this.
What is covered with a suitable sleeve?
These relieve the pump pressure when the system pressure reaches regulating range.
What are unloading valves?
This device provides a source for additional hydraulic power when heavy demands are placed on the system.
What is a fully charged hydraulic accumulator?
This component automatically directs fluid from either the normal source or an emergency source to an actuating cylinder.
What is a shuttle valve?
Blue in color, Vegetable base, natural rubber seals.
What is MIL-H-7644
Before removing the filler cap of a pressurized hydraulic reservoir, the aviation mechanic must first do this.
What is relieve the air pressure?
This relieves the pump of its load when no actuating units are being operated.
What is a hydraulic pressure regulator?
This device is used in a hydraulic system with a constant-delivery pump and allows circulation of the fluid when no demands are on the system.
What is a pressure regulator?
This would be the initial diagnosis if a pilot were to report that when the hydraulic pump is running, the pressure is normal. However, when the pump is stopped, no hydraulic pressure is available.
What is a leaking accumulator air valve?
Neoprene rubber packing materials must only be used in systems using this hydraulic fluid.
What is Mineral-base oil?
This component protects against overpressure when hydraulic system pressure control and relief units fail to function properly.
This is the device which converts fluid pressure into useful work.
What is a hydraulic actuating unit?