Door Flange: Temperature Range -40°C to +200°C

Component Specifications

Definition

A door flange is a critical sealing component in vacuum sealed door systems, typically consisting of a flat, machined metal ring with precisely drilled bolt holes and a sealing groove. It serves as the mating surface between the vacuum chamber door and the chamber body, creating a vacuum-tight seal when compressed with a gasket or O-ring. The flange must maintain dimensional stability under vacuum pressure differentials and thermal cycling while providing a reliable mechanical connection.

Working Principle

The door flange operates on the principle of compressive sealing. When the vacuum door is closed, bolts apply uniform pressure to compress an elastomeric or metal gasket within the flange's sealing groove. This compression creates a hermetic barrier that prevents air ingress, maintaining the required vacuum level inside the chamber. The flange's flatness and surface finish ensure even pressure distribution across the entire sealing surface.

Materials

Stainless steel (typically 304 or 316 grade) for corrosion resistance and vacuum compatibility; Aluminum alloys (6061-T6) for lightweight applications; Occasionally titanium for specialized high-temperature or corrosive environments.

Technical Parameters

Parameter	Typical range	Notes & selection driver
Seal Type	O-ring or flat gasket
Flange Type	KF, ISO, or CF
Vacuum Rating	10^-9 to 10^-6 mbar
Surface Finish	Ra ≤ 0.8 μm
Pressure Rating	Atmospheric to ultra-high vacuum
Temperature Range	-40°C to +200°C
Flatness Tolerance	≤ 0.05 mm
Bolt Circle Diameter	Standardized per vacuum flange standards

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 2861, ISO 1609, DIN 28403, DIN 28404

Parent Products

This component is used in the following industrial products

Vacuum Sealed Door

A specialized door designed to maintain vacuum integrity in pressure vessels and chambers.

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Engineering Analysis

Risks & Mitigation

Seal failure leading to vacuum loss
Surface corrosion compromising seal integrity
Thermal expansion causing bolt stress
Improper bolt torque causing uneven compression

FMEA Triads

Trigger: Insufficient bolt torque during installation
Failure: Uneven gasket compression leading to vacuum leaks
Mitigation: Implement calibrated torque wrench procedures and sequential bolt tightening patterns

Trigger: Surface contamination or damage on sealing face
Failure: Compromised seal integrity and vacuum degradation
Mitigation: Regular inspection protocols and proper cleaning procedures before assembly

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

±0.1 mm on critical dimensions, flatness within 0.05 mm over entire surface

Test Method

Helium leak detection (mass spectrometry) with sensitivity of 10^-9 mbar·l/s, pressure decay testing, and visual inspection of sealing surfaces

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

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

Manufacturers of Door Flange

Manufacturer profiles associated with Door Flange.

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Frequently Asked Questions

What is the difference between KF and ISO flange types?

KF (Klein Flange) uses a clamp and O-ring system for quick connections in medium vacuum applications, while ISO flanges use bolted connections with metal gaskets for high and ultra-high vacuum systems requiring superior sealing performance.

How often should door flange seals be replaced?

Elastomeric O-rings typically require replacement every 6-12 months depending on usage frequency and vacuum cycling, while metal gaskets can last several years but must be inspected for deformation during each maintenance cycle.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records. See the editorial policy.

Preliminary Technical Classification

This page supports structured research, RFQ preparation, and supplier evaluation. It does not replace buyer-led supplier qualification, standards review, or technical approval.

Door Flange