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