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Third Year > Hydraulics > Flashcards

Flashcards in Hydraulics Deck (22)
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1
Q

Pressure, force, area triangle

A
  • force is weight usually lbs
  • pressure is psi
  • area is just that pie x d2 divided by 4
2
Q

Power supplies

A

-prime mover (electric motor) -pumps -reservoir

3
Q

Control Device

A

-directional -pressure control -flow control

4
Q

Output

A

-actuator (rotary/linear) -loads

5
Q

Pressure

A
  • the force on a unit of area
  • pressure decreases when flow is increased
  • produced by resistance to flow
6
Q

Pascall’s Law

A

-relation between force, pressure & area -remember triangle

7
Q

Pressure creation

A

-resistance to flow -not a pump, pump creates flow

8
Q

Intensifiers

A

-contained fluid in two different areas in a cylinder -used to efficiently generate a high pressure fluid -output pressure is considerably greater than input pressure.

9
Q

Atmospheric Pressure

A

-how much weight is sitting on you right now from the air, etc… -14.7 psi at sea level

10
Q

Differential Cylinders

A

-cylinders with different areas on each side of piston -remember the area loss from the rod

11
Q

Non-differential cylinders

A

-areas on each side are the same -most two Rod cylinders

12
Q

Load Capacities

A

-the larger the area, the larger the force for the same pressure

13
Q

Extension

A

-on extension, the pressure acts on the area of the piston

14
Q

Retraction

A

-on retraction the pressure is the piston area minus the rod area (annulus area)

15
Q

Advantages of Hydraulics

A

-

16
Q

Disadvantages of Hydraulics

A

-

17
Q

2 to 1 cylinder

A

-the cross section area of the rod occupies exactly half the area of the cap end side

18
Q

Flow

A

-movement of a liquid produced by a pump or a pressure drop across a hole -the greater the pressure difference across a hole the greater the flow -the ratio of units/time. It can be expresses as velocity (ft/min, ft/sec) -flow info a differential cylinder does not equal flow out

19
Q

Flow Triangle

A
  • speed/flow/area relationship
  • V/t or Q stands for flow in cubic inches/minutes only -S stands for the speed in inches/minutes
  • A stands for the area in squares inches
20
Q

Hydraulic Intensifier Math Question

A

-

21
Q

Hydraulic Cylinder Math

A

-

22
Q

Porta Power Math

A

-Steps