Pneumatic and Hydraulic Symbols Quiz
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Questions and Answers

What happens when the pre-set pressure is too high in a variable pressure reducing valve?

  • It changes the air temperature
  • It opens and lets air escape (correct)
  • It creates a vacuum
  • It closes off the air supply

    • What is the purpose of the air service unit?

  • To stop unwanted particles from entering the system (correct)
  • To provide cooling for the system
  • To measure air flow
  • To increase air pressure

    • A time delay valve allows immediate flow of compressed air from port one to port two.

    False

    A shuttle/OR valve provides an output signal only when both left and right ports are active.

    <p>False</p> Signup and view all the answers

    What determines the length of time for a time delay valve to open?

    <p>The setting of the flow restrictor</p> Signup and view all the answers

    A three two valve has _____ connections and _____ positions.

    <p>three, two</p> Signup and view all the answers

    What type of cylinder generates linear movement and requires compressed air to extend?

    <p>Single acting cylinder</p> Signup and view all the answers

    Which of the following is NOT a method for actuating a valve?

    <p>Hydraulic</p> Signup and view all the answers

    The __________ valve allows compressed air to bypass the restriction.

    <p>One way restrictor</p> Signup and view all the answers

    Match the type of valve with its function:

    <p>Variable pressure reducing valve = Protects the system from over-pressure Time delay valve = Delays airflow based on a flow restrictor Three two valve = Manages airflow through connections Roller lever actuation = Operates through movement of a cylinder</p> Signup and view all the answers

    What does the two pressure/AND valve require to get an output signal?

    <p>Two input signals at the same time</p> Signup and view all the answers

    What is the effect of having the flow restrictor set to 100% open in a time delay valve?

    <p>The timing will be short</p> Signup and view all the answers

    A quick exhaust valve enables a cylinder to extend or retract slower than normal.

    <p>False</p> Signup and view all the answers

    The symbol for a compressor represents a __________.

    <p>Compressed air supply</p> Signup and view all the answers

    A valve can only be actuated using one type of signal: compressed air.

    <p>False</p> Signup and view all the answers

    Match the valve types with their functions:

    <p>Two pressure/AND valve = Requires two input signals for output Shuttle/OR valve = Provides output if at least one port is active One way restrictor valve = Slows down cylinder movement under certain conditions Quick exhaust valve = Increases speed of cylinder operation</p> Signup and view all the answers

    Which type of actuation allows a valve to operate on partial extension or retraction only?

    <p>Idle return roller actuation</p> Signup and view all the answers

    Spring return actuation dominates when there is active actuation on the left-hand side of the valve.

    <p>False</p> Signup and view all the answers

    What is the function of a selector switch in valve actuation?

    <p>It keeps the valve ON until it is manually turned OFF.</p> Signup and view all the answers

    A valve operated by a __________ uses electricity to actuate.

    <p>solenoid</p> Signup and view all the answers

    Match the actuation methods with their characteristics:

    <p>Pneumatic actuation = Operated when a pneumatic signal is presented Pushbutton actuation = Operated by a button and returns via spring Foot pedal actuation = Operated using a foot pedal Spring return actuation = Brings the valve back to the original position</p> Signup and view all the answers

    Which component will sense pressure and trigger an electrical switch once the pre-set pressure is achieved?

    <p>Pressure sensor</p> Signup and view all the answers

    The foot pedal actuation method involves the valve being set to a single state until it is released.

    <p>False</p> Signup and view all the answers

    What is a key feature of a time-on delay relay?

    <p>It activates the output after a set delay when the input is turned ON.</p> Signup and view all the answers

    What happens when the delay-on timer relay coil is activated?

    <p>The contact switches after a time delay.</p> Signup and view all the answers

    The pushbutton normally open will make a connection when pushed.

    <p>True</p> Signup and view all the answers

    What does a selector switch do when turned on?

    <p>It stays on until it is turned off.</p> Signup and view all the answers

    The symbol for the coil of a __________ represents a normal relay.

    <p>relay</p> Signup and view all the answers

    What role does the pressure relief valve play in the pump unit?

    <p>It prevents excessive pressure build-up.</p> Signup and view all the answers

    The four three hand-lever valve in the middle position allows for fluid flow without pressure building up.

    <p>True</p> Signup and view all the answers

    What type of switch is activated when a cylinder is fully extended or retracted?

    <p>Electrical limit switch</p> Signup and view all the answers

    Match the following relay symbols with their functions:

    <p>Normal relay = Switches contact upon activation Delay-on timer = Switches after a time delay Delay-off timer = Stays on until delay elapses Pushbutton normally closed = Breaks connection when pressed</p> Signup and view all the answers

    Study Notes

    Document Purpose

    • Intended to aid understanding and memorization of pneumatic, electro-pneumatic, and hydraulic symbols.
    • Lists components used in the module.
    • Some symbols require memorization; others must be understood for application.

    Pure Pneumatic Symbols

    Air Service Unit

    • Consists of a filter, manual drain, pressure relief/reducing valve, and a pressure gauge.
    • Prevents unwanted particles from entering the system.

    Air Service Unit (Simplified)

    • Same as the full air service unit, but smaller and takes up less space.

    Two Pressure/AND Valve

    • Requires two input signals simultaneously to produce an output signal on port two.

    Shuttle/OR Valve

    • Produces an output signal on port two if either the left or right port one is active.
    • Output on port two occurs if both left and right ports are active.

    One Way Restrictor Valve

    • Compressed air applied to port one bypasses restriction, flowing directly from port one to port two.
    • If compressed air is applied to port two, flow is directed through the restriction, slowing cylinder movement.

    Compressed Air Supply

    • This symbol represents a compressor.
    • Users can adjust pressure and flow in simulated environments.

    Single Acting Cylinder

    • This type of actuator generates linear movement.
    • It requires compressed air for extension and returns to its retracted position when air is removed.

    Double Acting Cylinder (with Limit Switches)

    • Has ports for extending and retracting.
    • Includes limit switches (a0 and a1) that activate events upon full extension or retraction.

    Quick Exhaust Valve

    • Allows for faster cylinder retraction/extension.
    • Typically has a restricted exhaust pathway, but port one is typically blocked during exhaust.

    Variable Pressure Reducing/Relief Valve

    • Automatically opens to release air when pressure exceeds the pre-set limit.
    • This prevents pressure from overcoming a system's threshold.

    Time Delay Valve (Normally Closed)

    • Has a time delay before opening to allow compressed air to flow from port one to port two.
    • Triggered by an air signal on port 12.
    • Flow timing depends on flow restrictor settings.

    Three Two Valve

    • Three connections and two positions.
    • Active port (right block) will block port one and connect exhaust (port three) to port two.
    • Alternatively, active left block connects port one to port two, blocking exhaust.
    • Similar principle applicable to five-two valve configurations.

    Ways to Actuate/Operate Valves

    • Mechanical, pneumatic, and electrical methods.

    Roller Lever Actuation

    • The actuation occurs when a cylinder retracts or extends.
    • Often used for three-two valves or five-two valves.

    Idle Return Roller Actuation

    • Valve operation on either retract or extend stroke, not both, unlike roller lever valves.
    • Actuation is not used in full extension or retraction; instead, it's for partial movements.

    Pneumatic Actuation

    • Valve is operated by a pneumatic signal on port 12.

    Spring Actuation (Spring Return)

    • Valve returns to its original position (rest position) via a spring when no active actuation is present on the left side.

    Pushbutton Actuation

    • Operated by a pushbutton.
    • A spring brings it back to its original position (spring return).

    Selector Switch (Detent Switch)

    • Valve activated by a selector switch that continuously remains active until switched OFF.

    Foot Pedal Actuated

    • Operated by a foot pedal.
    • This demonstrates mechanical actuation.

    Electropneumatic Symbols

    • Components with electrical and pneumatic connections; often shown separately in diagrams.
    • Examples: Solenoid Actuated valves

    Solenoid Actuated

    • Electrically actuated valve that uses 24V DC.
    • The electrical part is separate from the pneumatic part in diagrams.
    • Valve becomes active with 24V applied.

    Pressure Sensor

    • Consists of a pneumatic part and an electrical part for sensing pressure.
    • Operates a switch when the pressure reaches the pre-set amount.
    • The electrical part, shown separately, is operated when pressure is reached.

    Electric Symbols

    • Relays, time delay relays, time-off delay relays, along with switches, pushbuttons, and limit switches.

    Normal Relay

    • Has a relay coil and associated contacts (shown visually to the right.)

    Delay-on Timer

    • Activating the relay coil results in a delayed switching of associated contacts

    Delay-off Timer

    • Switching the relay coil results in a delayed switching of associated contacts.
    • Activating the coil sets off the time delay and stays on until the delay expires.

    Pushbutton (Normally Open)

    • A button that creates a connection when pressed.
    • Contact breaks when the button releases.

    Pushbutton (Normally Closed)

    • A button that creates a break in a connection when pressed.
    • Contact restores when the button releases.

    Selector Switch (Detent Switch)

    • Manually set switch, that stays on until turned off

    Electrical Limit Switch

    • Deployed when a cylinder fully extends or retracts.

    Hydraulic Symbols

    Pump Unit

    • Consists of a motor, pump (to generate pressure), pressure relief valve, and pressure gauge.
    • Fluid returns to the tank (indicated by the letter 'T').

    Four Three Hand-Lever Valve Centre Shutoff

    • Center position blocks any fluid flow
    • Position is adjusted using a lever

    Four Three Hand-Lever Valve With Bypass Position

    • Has a middle position that connects flow from the pressure side to the tank.

    Four Three Hand-Lever Valve With Floating Position

    • Has a middle position that allows fluid flow between two different parts.

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    Symbols PDF

    Description

    Test your knowledge of pneumatic, electro-pneumatic, and hydraulic symbols with this engaging quiz. Understand key components and their applications, as well as memorization of essential symbols. Perfect for engineering students and professionals alike.

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