Industry-Verified Manufacturing Data (2026)

Bourdon Tube/Sensor

Based on aggregated insights from multiple verified factory profiles within the CNFX directory, the standard Bourdon Tube/Sensor used in the Machinery and Equipment Manufacturing sector typically supports operational capacities ranging from standard industrial configurations to heavy-duty production requirements.

Technical Definition & Core Assembly

A canonical Bourdon Tube/Sensor is characterized by the integration of Bourdon tube and Linkage mechanism. In industrial production environments, manufacturers listed on CNFX commonly emphasize Phosphor bronze construction to support stable, high-cycle operation across diverse manufacturing scenarios.

A curved, elastic tube that converts pressure into mechanical displacement for measurement.

Product Specifications

Technical details and manufacturing context for Bourdon Tube/Sensor

Definition
The Bourdon tube is the primary sensing element in many pressure gauges and relief valve monitoring systems. It's a C-shaped or helical tube that straightens under internal pressure, with this mechanical displacement transmitted through linkages to indicate pressure on a dial or trigger relief valve activation.
Working Principle
When pressure is applied inside the curved Bourdon tube, the tube tends to straighten due to the pressure differential between the inside and outside. This elastic deformation creates mechanical displacement at the tube's free end, which is amplified through a linkage mechanism to move a pointer on a gauge scale or activate a relief valve mechanism.
Common Materials
Phosphor bronze, Beryllium copper, Stainless steel, Inconel
Technical Parameters
  • Tube diameter and wall thickness determine pressure range and sensitivity (mm) Per Request
Components / BOM
  • Bourdon tube
    Primary pressure sensing element that deforms under pressure
    Material: Phosphor bronze or stainless steel
  • Linkage mechanism
    Amplifies and transmits tube displacement to indicator
    Material: Steel or brass
  • Movement assembly
    Converts linear motion to rotary motion for dial indication
    Material: Steel with jewel bearings
  • Pressure connection
    Interface for connecting to pressure source
    Material: Brass or stainless steel
Engineering Reasoning
0.1-1000 bar
1200 bar (yield strength of C276 nickel alloy at 150°C)
Design Rationale: Plastic deformation due to hoop stress exceeding material yield strength (σ_θ = P·r/t > σ_y)
Risk Mitigation (FMEA)
Trigger Pressure cycling at 0.5-100 bar, 10^6 cycles
Mode: Fatigue crack at tube root section
Strategy: Shot peening to induce compressive residual stress of -400 MPa
Trigger Steam condensation at 180°C causing pH 4 acidic environment
Mode: Stress corrosion cracking along grain boundaries
Strategy: Electropolishing to Ra 0.2 μm surface finish

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Bourdon Tube/Sensor.

Applied To / Applications

This component is essential for the following industrial systems and equipment:

Industrial Ecosystem & Supply Chain DNA

Complementary Systems
Downstream Applications
Specialized Tooling

Application Fit & Sizing Matrix

Operational Limits
pressure: Up to 100,000 psi (6,900 bar) for high-pressure designs, typical range 0-15,000 psi
other spec: Accuracy: ±0.5% to ±2.5% of full scale, Response time: <100 ms, Overpressure safety: 150% of full scale
temperature: -40°C to 400°C (depending on material and fill fluid)
Media Compatibility
✓ Hydraulic fluids ✓ Compressed air/gases ✓ Steam (with appropriate material selection)
Unsuitable: Highly corrosive chemicals (e.g., concentrated acids, strong oxidizers) without special material protection
Sizing Data Required
  • Maximum operating pressure (including potential spikes)
  • Process media compatibility (chemical composition)
  • Required accuracy class and measurement range

Reliability & Engineering Risk Analysis

Failure Mode & Root Cause
Fatigue cracking
Cause: Cyclic pressure fluctuations causing stress concentration at the tube's fixed end or bends, leading to material fatigue and eventual fracture.
Zero shift/Calibration drift
Cause: Overpressure exposure beyond design limits causing permanent deformation of the Bourdon tube, or temperature variations affecting material elasticity and linkage mechanisms.
Maintenance Indicators
  • Pointer sticking or erratic movement indicating internal friction, binding, or linkage wear
  • Audible hissing or visible fluid/gas leakage at the sensor connections or housing
Engineering Tips
  • Install pulsation dampeners or snubbers upstream to reduce pressure cycling amplitude and frequency, minimizing fatigue stress
  • Implement regular calibration checks using deadweight testers at operating temperatures and maintain pressure within 75% of the sensor's maximum rated capacity

Compliance & Manufacturing Standards

Reference Standards
ISO 5171: Pressure gauges - Bourdon tube pressure gauges ANSI/ASME B40.1: Gauges - Pressure and Vacuum Indicating Dial Type DIN EN 837-1: Pressure gauges - Part 1: Bourdon tube pressure gauges
Manufacturing Precision
  • Bore diameter: +/-0.02mm
  • Tube wall thickness: +/-0.01mm
Quality Inspection
  • Hydrostatic pressure test
  • Dimensional verification with coordinate measuring machine

Factories Producing Bourdon Tube/Sensor

Verified manufacturers with capability to produce this product in China

✓ 96% Supplier Capability Match Found

S Sourcing Manager from Australia Jan 04, 2026
★★★★★
"Found 26+ suppliers for Bourdon Tube/Sensor on CNFX, but this spec remains the most cost-effective."
Technical Specifications Verified
P Procurement Specialist from Singapore Jan 01, 2026
★★★★☆
"The technical documentation for this Bourdon Tube/Sensor is very thorough, especially regarding technical reliability. (Delivery took slightly longer than expected, but technical support was excellent.)"
Technical Specifications Verified
T Technical Director from Germany Dec 29, 2025
★★★★★
"Reliable performance in harsh Machinery and Equipment Manufacturing environments. No issues with the Bourdon Tube/Sensor so far."
Technical Specifications Verified
Verification Protocol

“Feedback is collected from verified sourcing managers during RFQ (Request for Quote) and factory evaluation processes on CNFX. These reports represent historical performance data and technical audit summaries from our B2B manufacturing network.”

7 sourcing managers are analyzing this specification now. Last inquiry for Bourdon Tube/Sensor from Vietnam (1h ago).

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Frequently Asked Questions

What materials are best for Bourdon tubes in corrosive environments?

Stainless steel and Inconel are ideal for corrosive environments due to their excellent corrosion resistance and durability under harsh conditions.

How does a Bourdon tube convert pressure into measurable displacement?

The curved tube straightens slightly when pressure is applied, creating mechanical displacement that's transferred through linkage mechanisms to a measurement display.

What maintenance is required for Bourdon tube pressure sensors?

Regular calibration checks, inspection for material fatigue or corrosion, and ensuring clean pressure connections are essential for maintaining accuracy and longevity.

Can I contact factories directly on CNFX?

CNFX is an open directory, not a transaction platform. Each factory profile provides direct contact information and production details to help you initiate direct inquiries with Chinese suppliers.

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