Term
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Definition
| POWER TRANSMITTED AND CONTROLLED THROUGH THE USE A PRESSURIZED FORM. |
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Term
| What are the 2 types of Fluid Power? |
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Definition
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Term
| Hydraulics vs. Pneumatics. Hydraulics. |
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Definition
| Due to the incompressibility of oil hydraulic systems move more slowly but are capable of higher precision. |
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Term
| Hydraulics vs. Pneumatics. Pneumatics. |
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Definition
- Low power/Light loads.
- Low to moderate precision.
- Quick response. |
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Term
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Definition
Flexibility easy control of:
- Force
- Distance
- Speed |
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Term
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Definition
- Variable Speed
- Reversible
- Overload Protection
- Small Packages
- Can be Stalled
- Absence of Vibration
- Quiet Operation |
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Term
| Disadvantages of Hydraulics? |
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Definition
| Fluid leaks costs millions of dollars. |
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Term
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Definition
- Tank or reservior
- Lines or hoses
- Pump with a primer mover
- Relief valve
- Directional valve
- Actuator |
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Term
| What other components may a system have? |
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Definition
- Flow control valve
- Check valves
- Gages |
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Term
| Lines, tubes, pipes, or hoses. |
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Definition
- Fluid Conductors
- Steel Pipe
- Steel Tubing
- Flexible Hose |
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Term
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Definition
| Converts mechanical force and motion into fluid power. |
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Term
| What are the two types of pumps? |
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Definition
- Fixed Displacement
- Positive or variable displacement. |
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Term
| What is the "job" of the pump? |
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Definition
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Term
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Definition
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Term
| What is the primary function of a relief valve? |
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Definition
| To limit the working pressure of the circuit. |
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Term
| What is the primary function of a control valve? |
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Definition
| To control pressure which may include pressure reducing or flow control. |
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Term
| What do directional valves do? |
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Definition
| Directs the flow of fluid to the inlet ports. |
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Term
| What is an actuator/(cylinder) do? |
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Definition
| A device which converts fluid power into mechanical force and motion. |
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Term
| What are the 2 types of actuators? |
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Definition
- Linear (cylinder)
- Rotary (Motor) |
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Term
| Force is capable of producing a change in the _________ of a body. |
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Definition
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Term
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Definition
| One unit for measuring force. |
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Term
| What are the 3 ways force can change the motion of a body? |
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Definition
- It can cause a body to move.
= It can retard or stop a body which is moving.
- It can change the direction or motion. |
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Term
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Definition
| Any force which can stop or retard the movement of a body. |
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Term
| 2 "things" about resistance? |
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Definition
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Term
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Definition
| Frictional resistance is always present between the contacting surfaces of two objects when they are moving across one another. |
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Term
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Definition
- Inertia is the reluctance of a body to change in its motion.
- The more mass or matter an object has the heavier it is and the harder it is move. |
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Term
| What is an example of inertia? |
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Definition
| A lead ball is greater than a wooden ball. If both balls are kicked with the same force, the wooden ball will move faster and farther than the lead ball. |
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Term
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Definition
| A force which can cause a body to move. |
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Term
| When is inertia as energy a concern in fluid power system? |
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Definition
| When a load is required to be decelerated. |
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Term
| What are the 5 forms or energy? |
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Definition
- Mechanical
- Heat
- Electrical
- Light
- Chemical |
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Term
| Energies can change from ______ ______ to ________. |
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Definition
| from one form to another. |
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Term
| What are the 4 basic principles of hydraulics? |
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Definition
- Liquids have no shapes of their own.
- Liquids are practically incompressible.
- Liquids transmit applied pressure in all directions.
- Liquids provide great increases in work force. |
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Term
| Liquids have no shape of their own so they will... |
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Definition
acquire the shape of any container.
- Because of this, oil, in a hydraulic system will flow in any direction and into a passage of any size or shape. |
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Term
| To determine the intensity of the force or pressure, the force is divided by the area of the movable member. |
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Definition
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Term
| What are 4 facts about Hydraulic oil? |
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Definition
- Essentially non-compressible
- Transmit power
- Common liquid used is petroleum oil
- The most desirable property of oil is its lubrication ability |
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Term
| What is the purpose of the fluid? |
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Definition
- Power transmission
- Lubrication
- Sealing
- Cooling |
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Term
| Because liquids will acquire the shape of any container, oil, in a hydraulic system will flow... |
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Definition
| in any direction and into a passage of any size or shape. |
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Term
| What is the basic function of Pilot lines? |
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Definition
| Transmits fluid pressure to control another device. |
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Term
| What is the basic function of Working lines? |
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Definition
| To carry the fluid (pressure) doing the work. |
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Term
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Definition
| Pressure applied on a confined fluid is transmitted undiminished in all directions, acts with equal force on equal areas, and at right angles to them. |
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Term
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Definition
| To determine the total force exerted on a surface, it is necessary to know the pressure of force on a unit of area. |
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Term
| What is meant by "conservation of energy"? |
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Definition
| What is gained in force must be sacrificed in distance. |
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Term
| What is the output component of a hydraulic system named? |
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Definition
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Term
| What is the input component of a hydraulic system named? |
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Definition
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Term
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Definition
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Term
| Name 3 advantages of a Hydraulics system. |
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Definition
1. High Power/Large load capacity
2. Precise positioning
3. Smooth movement |
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Term
| What is the origin of the term "hydraulics"? |
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Definition
| From Greek words that mean "water" and "pipe". |
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Term
| What makes petroleum oil suitable as a hydraulic fluid? |
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Definition
- It is minimally compressible (0.5% @ 1,000psi)
- Its lubrication abilities. |
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Term
| What is the pressure at the bottom of a 20 ft column of oil? |
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Definition
8psi (P=F/A)
- Force (weight) of oil = 58lbs/cu.ft.
- Column area = 144in.sq. |
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Term
| What are 3 things you can say definitely about the pressures on opposite sides of an orifice when oil is flowing through it? |
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Definition
1. A pressure drop will exist,
2. Pressure will be lower "downstream",
3. If a pressure drop exists, then the rate of flow will also decrease. |
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Term
| What pressure is usually available to push liquid into the pump inlet? |
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Definition
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Term
| Why should the pump inlet vacuum be minimized? |
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Definition
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Term
| Why is loss of pressure usually not a symptom of pump malfunction? |
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Definition
| Because pressure can be lost only when there is a leakage path that will divert all the flow from the pump. |
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Term
| What determines the speed of an actuator? |
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Definition
| Its size and the rate of oil flow into it. |
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Term
| With which component does the design of hydraulic circuit begin? |
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Definition
| With the load to be moved. |
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Term
| What is the piston area of a 5 in. (127 mm) cylinder? A=pi/4∗d^2 |
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Definition
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Term
| What is the formula to compute piston area? |
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Definition
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