Bellows pressure gauges, the accordion artists of the pressure measurement world, utilize a unique approach. Instead of relying on tubes or diaphragms, they employ a stack of thin, flexible metal bellows that resemble an expandable accordion. As pressure increases, the bellows expand and contract, a subtle movement that's cleverly magnified into a readable pressure value. This design makes them well-suited for measuring high pressures or working with dirty or viscous fluids. Unlike their more delicate diaphragm or capsule counterparts, the bellows can handle rough environments without compromising accuracy. The expansion of the bellows is then translated into a pointer movement across a dial, providing a clear indication of the pressure.
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Features of Bellows Pressure Gauge
Bellows pressure gauges, the robust performers of the pressure gauge family, offer a distinct approach for challenging applications. Let's delve deeper into their key features:
Operating Principle:
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The Expanding Bellows: The heart of the gauge is a stack of thin-walled, metallic bellows, resembling a convoluted cylinder. This expandable structure expands and contracts in response to changes in pressure.
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Pressure and Movement: As pressure increases on the medium side (connected to the substance being measured), the bellows expands, increasing its overall volume. This expansion magnitude is directly proportional to the applied pressure.
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Movement Amplification: The subtle expansion of the bellows stack is then magnified by a linkage system. This system typically consists of levers or gears that translate the small movement into a larger rotation of a pointer.
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Pressure Reading Display: The magnified rotation of the pointer sweeps across a calibrated dial, indicating the pressure value. The dial markings correspond to specific pressure ranges for easy reading.
Key Features and Benefits:
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High-Pressure Capability: Bellows pressure gauges excel at measuring high pressure ranges, even exceeding thousands of psi in some designs. The robust construction of the bellows allows them to withstand significant pressure without deformation.
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Suitability for Harsh Environments: The bellows design can handle dirty or viscous fluids, abrasive particles, and even some corrosive media depending on the material selection. This makes them ideal for demanding industrial applications.
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High Accuracy: Bellows gauges can achieve high accuracy within their specified pressure range, making them reliable for critical measurements.
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Wide Pressure Range: Compared to other gauge types, bellows gauges can offer a wider pressure range, allowing them to be used in various applications with varying pressure needs.
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