Pressure Regulation Systems in Engines
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Pressure Regulation Systems in Engines

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Questions and Answers

What is the main function of the Pressure Regulating Valve (PRV)?

  • To act as a reverse flow protection
  • To protect against overpressure in the system
  • To provide mechanical locking of the butterfly valve
  • To regulate engine bleed pressure (correct)

    • Which component provides reverse flow protection in the pressure regulating system?

  • Over Pressure Valve (OPV)
  • High Pressure bleed Valve (HPV) (correct)
  • Pressure Regulating Valve (PRV)
  • Bleed regulated pressure transducer

    • How is the Pressure Regulating Valve (PRV) controlled?

  • Automatically by the bleed regulated pressure transducer
  • Hydraulically actuated through liquid pressure
  • Pneumatically operated and electrically controlled (correct)
  • Manually operated by a technician

    • What is the default state of the Over Pressure Valve (OPV)?

    <p>Normally open</p> Signup and view all the answers

    What component is used for monitoring and indicating the position of the PRV?

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

    Where is the Thermostat control Solenoid (ThS) installed in relation to the precooler exchanger?

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

    How is muscle pressure for the actuation of the OPV achieved?

    <p>From an upstream integral pressure port</p> Signup and view all the answers

    What type of transducer is used in the bleed regulated pressure transducer?

    <p>Silicon type</p> Signup and view all the answers

    What is the primary function of the PRV in regulating downstream static pressure?

    <p>It regulates static pressure to a maximum of 52 psi and a minimum of 44 psi.</p> Signup and view all the answers

    Under which condition does the BMC close the PRV?

    <p>When bleed pressure rises above 60 psi.</p> Signup and view all the answers

    How does the OPV provide backup protection against overpressure conditions?

    <p>It closes fully when upstream pressure reaches 85 psi.</p> Signup and view all the answers

    At what minimum upstream pressure will the PRV begin to open?

    <p>8 psi</p> Signup and view all the answers

    What happens if the temperature downstream of the precooler exceeds 235 degrees Celsius?

    <p>The PRV will reduce downstream static pressure.</p> Signup and view all the answers

    During which operational condition does the PRV function?

    <p>When APU bleed supply is active.</p> Signup and view all the answers

    Which component is responsible for detecting an overpressure condition?

    <p>The BMC.</p> Signup and view all the answers

    What is the maximum regulated pressure that the PRV will allow downstream?

    <p>52 psi</p> Signup and view all the answers

    What triggers the closure of the PRV in the engine bleed system?

    <p>Energizing the ThS by releasing the BLEED P/B</p> Signup and view all the answers

    Under what condition can the BMC automatically isolate engine bleed air supply?

    <p>If a pylon or wing leak is detected</p> Signup and view all the answers

    What is the role of the regulated pressure transducer in the bleed system?

    <p>To monitor system pressure and send fault messages</p> Signup and view all the answers

    What position is indicated to the BMC by the 'FC/NOT FC' microswitch?

    <p>The position of the bleed air valve</p> Signup and view all the answers

    How can the engine bleed system be manually isolated?

    <p>By releasing the BLEED P/B on the AIR panel</p> Signup and view all the answers

    When does the engine bleed valve remain closed?

    <p>As long as upstream pressure is higher than 52 psi</p> Signup and view all the answers

    What happens to the engine bleed system if an engine fire occurs?

    <p>The bleed system is isolated by releasing the FIRE P/B</p> Signup and view all the answers

    What is indicated on the ECAM BLEED page?

    <p>Position of the PRVs during operation</p> Signup and view all the answers

    Study Notes

    Pressure Regulating Valve (PRV)

    • The PRV regulates engine bleed pressure.
    • It's a butterfly valve controlled by a thermostat solenoid (ThS).
    • The ThS is connected to the PRV by a pneumatic sense line.
    • The PRV is normally closed by a spring-loaded mechanism.
    • It requires a minimum upstream pressure of 8 psi to open.
    • The PRV regulates downstream static pressure between 44 psi and 52 psi maximum.
    • The PRV closes when the temperature downstream of the precooler exchanger exceeds 235 degrees Celsius.

    Overpressure Valve (OPV)

    • The OPV protects the downstream pneumatic system if the PRV malfunctions.
    • It's a pneumatically actuated valve that's normally open.
    • It closes when upstream pressure exceeds 75 psi and fully closes at 85 psi.
    • The OPV remains closed as long as upstream pressure is higher than 52 psi.

    Bleed Regulated Pressure Transducer

    • It's a silicon-type transducer connected to a pressure tapping downstream of the system.
    • It monitors bleed pressure and provides information for fault isolation regarding the PRV and OPV.

    Pressure Regulation System

    • The PRV is normally spring-loaded closed, requiring a minimum upstream pressure of 8 psi to open.
    • The PRV controls downstream static pressure, maintaining it between 44 psi and 52 psi.
    • The ThS controls the PRV when the temperature downstream of the precooler exchanger is higher than 235 degrees Celsius.

    Overpressure Protection

    • The BMC detects overpressure conditions when bleed regulated pressure exceeds 60 psi.
    • The BMC closes the PRV and displays a warning message on the EWD.
    • The BLEED page on the SD displays the HPV and PRV closed in amber.
    • The OPV provides a fully pneumatic backup protection in case of PRV failure.

    Bleed System Isolation Function

    • Each engine bleed system can be isolated from the pneumatic manifold by closing the PRV.
    • This can be done manually by releasing the corresponding BLEED P/B on the AIR panel or automatically by the BMC.

    Automatic Isolation

    • The BMC can automatically isolate engine bleed air supply by energizing the ThS in several scenarios:
      • If a pylon or wing leak is detected.
      • If an overpressure condition occurs.
      • If an over-temperature condition occurs.
      • During engine start.
      • During APU bleed supply.

    Manual Isolation

    • The engine bleed system can be isolated manually from the pneumatic manifold by releasing the corresponding BLEED P/B on the AIR panel.

    Monitoring

    • The bleed regulated pressure transducer is used for monitoring and fault isolation regarding the PRV and OPV.
    • A fault message is sent to the ECAM and CMS for maintenance purposes.

    Fire Isolation

    • In case of an engine fire, the bleed system is isolated by releasing the corresponding FIRE P/B on the overhead panel.
    • The ECAM BLEED page shows the position of the PRVs.

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    Related Documents

    A330-200/300 Training Manual (CFM56/V2500) PDF

    Description

    This quiz covers the functioning of Pressure Regulating Valves (PRV) and Overpressure Valves (OPV) in engine systems. It includes details about their operational mechanisms, interactions, and pressure specifications. Test your knowledge on the technical aspects of regulating engine bleed pressure.

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