Pressure connection: Port Size 1/4", 1/2", 3/8" (common)

Q: What are the most common failure modes for pressure connections in Bourdon tube sensors?

Common failures include thread stripping from overtightening, seal degradation from chemical incompatibility, corrosion from harsh environments, and blockage from particulate contamination in the fluid stream.

Q: How do I select the right pressure connection material for my application?

Material selection depends on the process fluid's chemical properties, temperature, pressure, and environmental conditions. Stainless steel offers general corrosion resistance, while specialized alloys like Hastelloy handle aggressive chemicals. Always verify compatibility charts and consider industry standards.

Component Specifications

Definition

A mechanical fitting or assembly designed to connect a Bourdon tube pressure sensor to a process system, ensuring a sealed, stable interface that transmits fluid pressure from the system to the sensor's sensing element without leakage or distortion.

Working Principle

The pressure connection creates a sealed pathway between the process fluid and the Bourdon tube. System pressure is transmitted through this connection to the curved Bourdon tube, causing it to straighten proportionally to the pressure. This mechanical movement is then translated into a readable measurement through linkage mechanisms.

Materials

Stainless steel (AISI 316L, 304), brass (C36000), Monel, Hastelloy, or carbon steel with appropriate coatings. Seals typically use PTFE, Viton, EPDM, or Buna-N depending on media compatibility.

Technical Parameters

Parameter	Typical range	Notes & selection driver
Leak Rate	<1×10⁻⁹ mbar·L/s (helium leak tested)
Port Size	1/4", 1/2", 3/8" (common)
Pressure Range	0-1000 psi (standard), up to 10,000 psi (high-pressure variants)
Connection Type	NPT, BSP, G-thread, SAE, Flange
Temperature Range	-40°C to 120°C (standard), up to 400°C (high-temperature variants)

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Standards

ISO 1179, DIN 3852, ASME B1.20.1, ISO 7-1

Parent Products

This component is used in the following industrial products

Bourdon Tube/Sensor

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

View Product Details

Engineering Analysis

Risks & Mitigation

Thread damage during installation
Chemical incompatibility with process media
Vibration-induced loosening
Thermal expansion mismatch
Particulate contamination blocking pressure transmission

FMEA Triads

Trigger: Improper installation torque
Failure: Thread stripping or seal damage leading to leaks
Mitigation: Use calibrated torque wrenches, follow manufacturer specifications, implement installation training programs

Trigger: Material incompatibility with process fluid
Failure: Corrosion, cracking, or seal degradation causing system contamination
Mitigation: Conduct thorough material compatibility testing, use corrosion-resistant alloys, implement regular inspection schedules

Trigger: Vibration in the system
Failure: Connection loosening over time leading to pressure loss
Mitigation: Use thread locking compounds, install vibration dampeners, implement preventive maintenance checks

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

Thread dimensions per ISO 1179 Class A, pressure rating ±1% of full scale, leak rate <1×10⁻⁹ mbar·L/s

Test Method

Helium leak testing per ASTM E499, pressure cycling test per ISO 19879, material verification via PMI (Positive Material Identification)

Procurement Evaluation Criteria

A practical evidence checklist for RFQ preparation and supplier evaluation.

Technical documentation

Request current drawings, revision history, and a signed specification sheet.

Manufacturing capability

Verify equipment lists, process limits, capacity, and representative production evidence.

Inspection readiness

Confirm test methods, calibrated equipment, sampling plans, and traceable reports.

Supplier transparency

Check the legal entity, factory address, ownership, certifications, and direct contacts.

CNFX does not score or rank suppliers. Buyers must verify all claims and documents with the legal manufacturer before ordering.

Manufacturers of Pressure connection

Manufacturer profiles associated with Pressure connection.

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Compiled and source-reviewed by the CNFX editorial team. Each manufacturer above links to the page on that company's own website where the product is listed, with the date we checked it. How we source and review

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Frequently Asked Questions

What are the most common failure modes for pressure connections in Bourdon tube sensors?