Class 2 (2nd Engineer) MEKG 📅 Nov 2023

Exam Question

Sketch, and describe, a valve suitable for reducing air pressure and maintaining the reduced pressure within close limits. Describe the processes through which air from the starting air receivers should be treated before it is used in a pneumatic control system. (16)

Reference Answer

### Part 1: Pressure Reducing Valve
A pressure reducing valve is a self-acting control valve designed to reduce a high, often fluctuating, upstream pressure to a lower, stable, and pre-set downstream pressure, regardless of variations in upstream pressure or downstream demand.
#### Construction
A typical direct-acting, diaphragm-type pressure reducing valve consists of the following components:

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