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
📅 Mar 2024
Reference Answer
This answer provides a comprehensive, Surveyor-Grade explanation of the specified engine room fittings/devices, detailing their concept, construction, operation, and applications to achieve full marks.
**(a) Gate Valve**
* **Concept**: A gate valve is a multi-turn, isolation valve designed primarily for **on-off service**, meaning it is intended to be operated fully open or fully closed. It is generally **not suitable for throttling** or regulating flow, as partial opening can lead to seat and gate erosion due to high fluid velocity and vibration, known as ‘wire-drawing’ or ‘chattering’.
* **Construction**:
**(a) Gate Valve**
* **Concept**: A gate valve is a multi-turn, isolation valve designed primarily for **on-off service**, meaning it is intended to be operated fully open or fully closed. It is generally **not suitable for throttling** or regulating flow, as partial opening can lead to seat and gate erosion due to high fluid velocity and vibration, known as ‘wire-drawing’ or ‘chattering’.
* **Construction**:
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