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Hydraulics
Hydraulics Terms
Term | Definition |
---|---|
Liquid in a Hydraulic system, Gas or air in a Pneumatic system | What does a fluid power system use as the medium through which to transmit force from one part of the system to the other? |
Blaise Pascal | Who first formulated that 'a change in pressure at any point in an enclosed fluid at rest is transmitted undiminished to all points in the fluid'? |
Pressure | Pascal's can be used as a unit of measurement for __________? |
Pressure | _____________ is force per unit of area. |
The larger piston | In a simple enclosed hydraulic system with pistons of different surface area, which requires the most force to move it? |
Multiplied | If force is applied to the smaller piston, the force will be ____________ at the larger piston? |
Liquid | Hydraulic systems allow force to be transmitted by the use of_________. |
Incompressible | Liquids are mostly ________________. |
PSI | Pressure is measured in __________. |
Force Divided by Area | When pressure is unknown, it is calculated as _____________. |
Pressure Times Area | When force is unknown, it is calculated as _______________. |
Hydraulic Pump | The ________________ is used to force the fluid from the reservoir to rest of the hydraulic circuit by converting mechanical energy into hydraulic energy. |
The extension speed stays the same | What happens to the extension speed of a cylinder rod when the rod diameter decreases, the pressure increases, but the flow rate to the cylinder stays the same? |
Synchronized | Two cylinders that work together in unison are said to be _____________________. |
The Rate At Which Work Is Done. | Power is __________________________________. |
Using a cylinder of greater size without changing the flow rate to the cylinder | Two ways to decrease the speed at which a cylinder rod extends or retracts are by using a flow control valve to decrease the flow rate into the cylinder and by __________. |
Work | What is the motion of a load through a distance that results in something useful being done? |
Limit | It is necessary to have a pressure relief valve in order to _________________ the maximum system pressure and working forces. |
Reservoir | In a hydraulic circuit, the ________________ holds the oil. |
Small | Hydraulic power requires a ______________ amount of energy to control and transmit tremendous power. |
Filters | ____________ are used to remove any foreign particles so as keep the fluid system clean and efficient, as well as avoid damage to the actuator and valves. |
Pressure | The _____________port on the power unit provides oil under pressure to the circuit. |
Confined | Hydraulic pressure created on a ___________ liquid generates forces that can lift heavy loads |
Decrease | Using a cylinder of greater size without changing the flow rate to the cylinder will ______________ the speed of the cylinder. |
Liquid | Hydraulics uses _______________ to transmit power. |
Hydraulics | Automobile brake systems use ______________________. |
Power Input Device | The pump that provides hydraulic power to the system. The pump draws oil from the reservoir and pumps it into the supply line. This component is called the _______________. |
Control Devices | ____________________ are valves that control direction, pressure, and flow rate of the pressurized oil in the hydraulic system. |
Power Output Device | Hydraulic power is converted back into mechanical power at the ______________________. |
Conductors | __________________ transmit the liquid in a hydraulic system. |
Mineral Oil | Hydraulic fluid is typically _____________________. |
Directional Control Valve | What does D.C.V stand for? |
Hydraulic Jack | |
Force | Pressure is a measure of _________________ intensity. |
Pascals | The units of pressure measurement used in the S.I. system are _________________. |
Actuator | The power output device of a hydraulic system is know as the ____________________. |
Cylinders | Actuators that produce straight line mechanical motion are called ______________________. |
Motors | Actuators that produce rotary motion are called ______________________. |
Mechanical | The actuator converts hydraulic energy into _______________________ energy. |
Clockwise | To increase the pressure setting of a relief valve, turn the adjustment knob _________________. |
Minimum | Power units are normally stopped and started with the relief valve set at the _________________ pressure. |
Temperature | The liquid level gauge often indicates the oil's __________________________ as well as its level. |
Filter | Pumps always have a(n) _______________________ attached to their suction lines to clean the oil. |
Springs | _______________ are used to hold the position of a 3 |
Double | Action |
Quick Connect | A(n) __________________________ fitting is used whenever there is a need to frequently disconnect circuits. |
Bourdon Tube | A ___________________________ pressure gauge uses a curved tube to indicate pressure. |
Tee | Two branch circuits are connected with a _____________________. |
Cross | Three branch circuits are connected with a _____________________. |
Positions, Ways | A 3/4 DCV refers to the number of ______________ and ___________. |
Hydraulics | Vehicle lifts use which type of fluid power system? |
Fluid injection injury | Serious injury associated with pinhole leaks in hydraulic lines. |
Power Unit | Contains the pump that provides fluid flow through the system |
Control devices | Devices that control the fluid direction and flow throughout the system |
Actuator | Component that does work in a fluid power system |
Liquid level gauge | Indicates the oil level in the hydraulic reservoir |
Suction line filter | A filter that oil flows through before it goes into the pump |
High viscosity | Thick fluid viscosity |
Schematic diagrams | Identifies components and circuit design |
True | Pinhole leaks in a pressurized line can penetrate leather gloves |
True | Fluid injection injury requires immediate medical attention. |
Pressure gauge | Measures system pressures |
Piston | Part of a cylinder the oil exerts its pressure on |
Quick connect fittings | Allow easy disconnecting and connecting of hydraulic lines |
Hydraulic motor | Produces rotary motion |
Fixed Displacement | General displacement of hydraulic motors |
True | Preventive maintenance of a hydraulic system involves replacing oil filters |
Needle valve | Another name for a flow control valve |
Vaporous cavitation | Caused by water in a hydraulic system |
Prime mover | Electric motor or gasoline engine that turns the pump |
Filler/breather | Where oil is added to the reservoir |
Power unit | Prime mover, pump, and reservoir |
Check valve | Allows flow in only one direction |
A and B | DCV ports that the actuator is connected to |
Pressure relief valve | Limits the maximum system pressure and working forces |
Flow Meter | Device used to determine is fluid is flowing within a hydraulic system |
Temperature | Liquid level gauges sometimes indicate the oil |
Gear on Gear pump | Pump that contains two gears that turn in the opposite direction |
Spring | 3 position DCV is held in the middle position by a |
Hydraulics | Fluid power system that is used when rigidity is required |
Force | Area times pressure equals |
Square footage | Length times width equals |
Cubic footage | Length times width times height equals |
Pressure | Resistance of a hydraulic system to fluid flow causes |
compression | Expanding hoses can give the appearance of |
4/3 DCV | DCV with 4 fluid paths and 3 positions |
Directional Control Valve | DCV stands for |
International Standards Organization | ISO |
National Fluid Power Association | NFPA |
American Society of Mechanical Engineers | ASME |
Newton | SI Unit for Force |
Pascal | SI Unit for Pressure |
Pound | English unit for Force |
PSI | English unit for Pressure |
Pounds per square inch | PSI |
14.7 PSIA | Atmospheric Pressure |
Pounds per square inch gauge | PSIG |
Pounds per square inch absolute | PSIA |
Cylinder and motor | Two types of hydraulic actuators |
Vacuum | Pressure below zero on a pressure gauge |