Differential Pressure Gauge Working Principle | How It Works

Ever wondered how a Differential Pressure Gauge converts a tiny pressure difference into a visible needle movement? This video breaks down the working principle step by step—from pressure entering the sensing bellows to the movement of the central mechanism, linkage, sector gear and pinion, and finally the movement of the pointer across the dial. See how pressure applied from either side creates opposite mechanical movement, allowing the instrument to indicate both positive and negative differential pressure. A visual explanation of how pressure difference becomes mechanical displacement—and mechanical displacement becomes a readable measurement.