Avk Double Eccentric Butterfly Valve

18 Questions

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Valve Quizzes & Trivia

This test is designed to guage your knowledge and understand of the AVK 756 series double eccentric butterfly valve.


Questions and Answers
  • 1. 
    The double eccentric principle is so named due to...?
    • A. 

      The valve faces being double as far apart as those seen in a concentric valve.

    • B. 

      The valve having a double function sealing system.

    • C. 

      The valve shaft being offset from the centre along 2 axis.

    • D. 

      The lifetime of the AVK valve being double that of most competitors.

  • 2. 
    PN ___ is the highest pressure rating for which the series 756 can be offered.
  • 3. 
    The plate disc design series 756 butterfly valve is available in the following size ranges:
    • A. 

      50 - 2000

    • B. 

      200 - 1200

    • C. 

      200 - 2200

    • D. 

      100 - 1800

  • 4. 
    • A. 

      The valve can be installed in any position: vertical, horizontal or tilting.

    • B. 

      The valve can function as a modulating valve.

    • C. 

      When the valve is fully closed the disc is a few degrees off from being parallel to the valve face.

    • D. 

      The disc face is rounded.

  • 5. 
    Which one of the following is an advantage of the series 756 butterfly valve compared to VAG and Erhard butterfly valves?
    • A. 

      Rubber components from AVK Gummi.

    • B. 

      Lower weight.

    • C. 

      Reduced wear on the rubber sealing.

    • D. 

      All of the above.

  • 6. 
    What are the advantage of the fixated disc design?
    • A. 

      It eliminates the possibility of disc flutter.

    • B. 

      It makes tampering with the disc impossible.

    • C. 

      It has a lower manufacturing cost than other solutions.

    • D. 

      There are no real-world advantages of a fixated disc.

  • 7. 
    What is the difference between the seal on series 756 butterfly valve between DN 200-600 and DN 700-2200.
    • A. 

      The larger valves have a higher quality of EPDM rubber.

    • B. 

      You can replace the seal on the smaller valves. This is not possible on larger valves

    • C. 

      The shape of the rubber seal and the retaining ring.

    • D. 

      There are no differences.

  • 8. 
    Extensive cycle tests have been conducted showing no visible wear and tear on the seal of series 756 butterfly valve. How many operating cycles?
    • A. 

      3000

    • B. 

      6000

    • C. 

      9000

    • D. 

      12000

  • 9. 
    The shaft sealing of a series 756 butterfly valve cannot be replaced under pressure?
    • A. 

      True

    • B. 

      False

  • 10. 
    What is the purpose of the locking device available on valves DN700-2200?
    • A. 

      It makes tampering with the valve impossible.

    • B. 

      It locks the disc in place when it is fully opened or fully closed.

    • C. 

      It allows the gearbox to be locked so the valve cannot be operated by unauthorized persons.

    • D. 

      It allows the disc to be locked in place temporarily for carrying out repairs or maintenance, such as the replacement of a gearbox.

  • 11. 
    Which is an essential part of the high quality coating procedure used for the series 756 butterfly valve?
    • A. 

      Blast cleaning to ISO 12944-4.

    • B. 

      Epoxy coating to DIN 30677-2 and GSK.

    • C. 

      Quality control procedures and audits.

    • D. 

      All of the above.

  • 12. 
    The 756 butterfly valve is available with the option of a stainless steel seat. The advantage is:
    • A. 

      It is more economical than an integral seat.

    • B. 

      It is lower in weight than an integral seat.

    • C. 

      It offers more assurance against leaks.

    • D. 

      It is replaceable and is ideal for high wear and tear systems.

  • 13. 
    From DN700-1200 the series 756 butterfly valve is available with a flow-through disc design. What is the advantage of the flow-through disc?
    • A. 

      It is ideal for modulation purposes.

    • B. 

      It has a substantially reduced weight.

    • C. 

      It is less sensitive to cavitation and offers lower headloss.

    • D. 

      There are no inherent advantages of flow-through disc: some markets merely require this specification.

  • 14. 
    What is the difference between an IP67 and an IP68 gearbox?
    • A. 

      IP67 is clockwise to open, IP68 is clockwise to close.

    • B. 

      IP67 has a 5 year warranty, IP68 has a 10 year warranty.

    • C. 

      IP67 is made to EN standard, IP68 is made to AWWA standard.

    • D. 

      IP67 is for above ground use, IP68 is for below ground (submerged) use.

  • 15. 
    There are numerous reasons for using high quality rubber in butterfly valves for drinking water. Which is NOT a reason?
    • A. 

      EPDM is much easier to manufacture than almost all other types of rubber.

    • B. 

      Resistance to common elements found in drinking water, such as ozone and chlorine.

    • C. 

      EPDM rubber offers an excellent compression set.

    • D. 

      EPDM is approved for drinking water purposes.

  • 16. 
    The series 756 butterfly valve is heavier than a gate valve of the same diameter?
    • A. 

      True

    • B. 

      False

  • 17. 
    The series 756 butterfly valve is ideal for modulation purposes.
    • A. 

      True

    • B. 

      False

  • 18. 
    A series 756 butterfly valve has higher headloss than a gate valve of the same diameter.
    • A. 

      True

    • B. 

      False