Exam Question
Write short notes to explain the following fittings/devices used in engine room, and their applications: (16)
(a) Gate valve
(b) Butterfly valve
(c) Quick Closing valve
(d) Valve actuators
Class 4 (4th Engineer)
MEKG
📅 Dec 2024
Reference Answer
### (a) Gate Valve
* **Concept and Function:**
* A gate valve is a multi-turn, isolation valve designed primarily for **on/off service** (fully open or fully closed). It functions by lifting a rectangular or wedge-shaped gate out of the path of the fluid. When fully open, the gate valve creates a **full bore** opening, resulting in minimal pressure drop across the valve.
* It is not designed for throttling or regulating flow due to the potential for excessive wear on the gate and seats when operated in a partially open position, leading to cavitation and vibration.
* **Concept and Function:**
* A gate valve is a multi-turn, isolation valve designed primarily for **on/off service** (fully open or fully closed). It functions by lifting a rectangular or wedge-shaped gate out of the path of the fluid. When fully open, the gate valve creates a **full bore** opening, resulting in minimal pressure drop across the valve.
* It is not designed for throttling or regulating flow due to the potential for excessive wear on the gate and seats when operated in a partially open position, leading to cavitation and vibration.
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