UKM Tuticorin

Tag: #valvepositioner

  • EK General Oct 2021 (Q2)

    EK General Oct 2021 (Q2)

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    by

    UKM TUTICORIN
    in

    With reference to pneumatically operated control valves: (a) State FOUR reasons for fitting a valve positioner (4) (b) Explain valve hysteresis, stating how it affects the process (2) (c) State the immediate action to be taken to restore control upon failure of the positioner bellows (2) (d) State the difference between fail safe and fail…

  • EK General Aug 2020 (Q2)

    EK General Aug 2020 (Q2)

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    by

    UKM TUTICORIN
    in

    With reference to pneumatically operated control valves: (a) State the reasons for fitting a valve positioner; (4) (b) Describe, with the aid of a sketch, valve hysteresis, stating how it affects the process; (3) (c) Describe how design and routine maintenance can limit hysteresis. (3) Control system Aug 2020 (Q2)