Lesson 5: Hydraulic Valves

Question 1

What are the 2 types of valves?

Answer 1

Flow and Pressure

Question 2

This type of valve selects the route of flow

Answer 2

Flow Valve

Question 3

Purpose of SELECTOR valves?

Answer 3

determines the direction of fluid flow

Question 4

Poppet, rotary, spool, are all types of what?

Answer 4

Selector Valve

Question 5

If fluid does not pass through the valve when OFF what type is it?

Answer 5

Closed Centre

Question 6

Poppet selector valves are controlled by what?

Answer 6

CAMS

Question 7

This type of selector valve has a cylinder inside that rotates

Answer 7

ROTARY

Question 8

This selector valve uses a piston and is used for flight controls/landing gear/autopilot

Answer 8

SPOOL

Question 9

What are the 2 types of check valves?

Answer 9

Inline Integral

Question 10

Purpose of restrictors?

Answer 10

reduce fluid flow by reducing passage area

Question 11

This type of valve is similar to a check valve but follows a series of events

Answer 11

Sequence Valve

Question 12

Similar to pressure activated sequence valves except that they are used to ensure essential systems are given priority over non-essential systems

Answer 12

Priority Valves

Question 13

Purpose of quick disconnect valves?

Answer 13

maintenance suction lines

Question 14

Purpose of FUSES

Answer 14

prevent loss of fluid DOWNSTREAM

Question 15

2 types of fuses?

Answer 15

Pressure drop Volume

Question 16

2 ways of resetting a fuse?

Answer 16

manually bleed off self reset

Question 17

How does the pressure drop fuse work?

Answer 17

pressure spring piston

Question 18

WHich type of fuse allows reverse flow?

Answer 18

Volume

Question 19

This type of valve is used to provide an alternate route for fluid to travel when required(back-up or emergency operation)

Answer 19

Shuttle valve

Question 20

How does a shuttle valve work?

Answer 20

piston shift

Question 21

Purpose of shut off valves?

Answer 21

shut off supply of hydraulic fluid

Question 22

Where do we use shut off valves?

Answer 22

engine firewall shut off maintenance iso inlet to actuators

Question 23

These valves used to regulate or control the pressure in a hydraulic system.

Answer 23

Pressure control valve

Question 24

What are the types of pressure control valves?

Answer 24

relief regulator reducer

Question 25

Purpose of system RELIEF valve?

Answer 25

backup for main pressure reg high pressure check valve

Question 26

Purpose of thermal relief valves?

Answer 26

relieve pressure caused by thermal expansion

Question 27

Purpose of pressure regulators?

Answer 27

maintain a specified pressure range in a closed-centre hydraulic system powered by a constant displacement EDP

Question 28

Where would you use a pressure reducer?

Answer 28

where component or sub-system pressure is less than system pressure (eg autopilot servo)

Question 29

What are the 3 types of IN LINE check valves?

Answer 29

Ball Cone SWING

Question 30

What type of valve is this?

Answer 30

POPPET selector valve

Question 31

What type of valve is this?

Answer 31

Closed Centre SPOOL type selector valve

Question 32

What type of check valves are these?

Answer 32

IN LINE check valves

Question 33

Identify this type of valve

Answer 33

VARIABLE orifice RESTRICTOR valve

Question 34

What type of valve is this?

Answer 34

Sequence valve

Question 35

What type of valve is this?

Answer 35

PRIORITY VALVE

Question 36

What type of valve is this?

Answer 36

QUICK DISCONNECT VALVE

Question 37

What type of valve is this?

Answer 37

Volume type FUSE

Question 38

What type of valve is this?

Answer 38

SHUTTLE valve

Question 39

What type of valve is this?

Answer 39

PRESSURE RELIEF valve

Question 40

What type of valve is this?

Answer 40

THERMAL RELIEF valve

Question 41

What type of valve is this?

Answer 41

Pressure REDUCER