Hydraulics

Question 1

What are hydraulic O-rings made from?

Answer 1

Fluorocarbon elastomers

Question 2

How hot do O-rings keep their elasticity till?

Answer 2

300°C

Question 3

What happens when O-rings overheat and burn?

Answer 3

They give off dangerous hydrogen fluoride which is toxic and forms hydrofluoric acid in your lungs from the moisture

Question 4

What are the 2 categories for hydraulic oils?

Answer 4

Petroleum based oil

Synthetic oil

Question 5

What type of oil is used on submarines?

What colour is it?

Answer 5

OX30

Red

Question 6

What type of oil is used on type 23 and 45?

What colour is it?

Answer 6

OM33

Yellow/orange

Question 7

What type of oil is used on type 22, 42 and CVS vessels?

What colour is it?

Answer 7

OX40

Green

Question 8

What are the desirable properties of hydraulic oil?

Answer 8

As incompressible as possible
Easy to flow through pipes and tubes
Sealing properties
Lubrication properties 
Transmits heat easily

Question 9

What are the desirable properties of hydraulic oil?

Answer 9

As incompressible as possible
Easy to flow through pipes and tubes
Sealing properties
Lubrication properties 
Transmits heat easily

Question 10

What does demulsibility mean?

Answer 10

How easily the substance will separate from water

Question 11

Why are anti-oxidants added to oil?

Answer 11

To remove oxygen as it bonds with hydrogen and carbon and forms a sludge which will clog the systems

Question 12

List 6 commonly used hydraulic pumps

Answer 12

Lobe pump
Vane pump
External gear pump
Internal gear pump
Axial piston pump
Radial piston pump

Question 13

Briefly explain the axial pumps operation

Answer 13

The shaft turns the cylinder block which in turn moves the pistons around in a circular path. The pistons are held against an angled swash plate with springs inside the cylinder. You can increase the flow or reverse the flow by changing the angle on the swash plate.

Question 14

What does an actuator do?

Answer 14

Converts hydraulic power into mechanical

Question 15

What types of actuator are there?

Answer 15

Linear

Rotary

Question 16

What is the purpose of theboil drain leg?

Answer 16

To remove excess oil that has been used to lubricate and cool the actuator parts and return it to the oil tank

Question 17

What are the advantages of hydraulics over electric motors?

Answer 17

1/12 the size of electrical motors for the same power
High torque at low speed
Reliable
Easy to understand
Easily reversed
Infinite speed ranges
Low spark risk
Able to withstand overload