INDUSTRY COMPONENT

Vacuum Flanges

Vacuum flanges are standardized connectors that create leak-tight seals between vacuum system components, enabling modular assembly and maintenance.

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Component Specifications

Definition
Vacuum flanges are precision-engineered mechanical interfaces designed to connect vacuum chambers, pumps, valves, gauges, and other components while maintaining ultra-high vacuum (UHV) or high vacuum (HV) integrity. They feature precisely machined sealing surfaces, bolt patterns, and gasket grooves to prevent atmospheric leakage and contamination. In cold trap/condenser applications, they provide reliable connections between the trap body, inlet/outlet ports, and vacuum pumping systems.
Working Principle
Vacuum flanges create a hermetic seal by compressing a deformable gasket (such as elastomer O-rings, metal seals, or copper gaskets) between two precisely aligned flange faces using bolts or clamps. The compression force deforms the gasket to fill microscopic surface imperfections, preventing gas molecules from passing through. Different flange types (KF/QF, ISO, CF) use specific sealing mechanisms: elastomer O-rings for quick connections, metal gaskets with knife-edge seals for UHV applications, or copper gaskets with conflat designs for high-temperature environments.
Materials
Common materials include 304/316 stainless steel (for corrosion resistance and UHV compatibility), aluminum alloys (for lightweight applications), and occasionally brass or carbon steel. Sealing surfaces are often electropolished or precision-machined to Ra < 0.8 μm. Gasket materials vary: Viton or Buna-N elastomers for moderate vacuum, copper or aluminum for metal seals, and Helicoflex for combined metal-elastomer designs.
Technical Parameters
  • Seal Type Elastomer O-ring, Metal Gasket (Copper/Aluminum), Helicoflex
  • Size Range DN 10 to DN 500 (or 1/2" to 20")
  • Flange Types KF/QF (Quick Flange), ISO (Large Flange), CF (ConFlat)
  • Pressure Rating 10^-9 to 10^-3 mbar (UHV to rough vacuum)
  • Connection Method Bolted, Clamped (KF), Screwed
  • Temperature Range -20°C to 450°C (depending on gasket material)
Standards
ISO 1609, ISO 2861, DIN 28404, DIN 28403

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Vacuum Flanges.

vacuum flange cold trap flange condenser flange ISO flange KF flange CF flange vacuum sealing UHV flange vacuum system components Vacuum Flanges Vacuum Flanges in Machinery and Equipment Manufacturing

Parent Products

This component is used in the following industrial products

Cold Trap/Condenser

A vacuum system component that condenses vapors and traps contaminants by cooling surfaces below their dew points.

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Engineering Analysis

Risks & Mitigation
  • Leakage due to improper installation
  • Gasket degradation at high temperatures
  • Corrosion in aggressive environments
  • Misalignment causing seal failure
FMEA Triads
Trigger: Insufficient bolt torque or uneven tightening
Failure: Leak development leading to loss of vacuum
Mitigation: Use torque wrenches and follow star-pattern tightening procedures; implement regular leak-check protocols
Trigger: Gasket material incompatible with process temperature or chemicals
Failure: Gasket degradation and catastrophic leak
Mitigation: Select gasket materials based on temperature range and chemical compatibility charts; use metal gaskets for extreme conditions
Trigger: Scratches or contamination on flange sealing surfaces
Failure: Micro-leaks that degrade vacuum performance
Mitigation: Implement clean handling procedures; use protective caps; polish or replace damaged flanges

Industrial Ecosystem

Compatible With

Interchangeable Parts

Compliance & Inspection

Tolerance
Flatness within 0.05 mm per 100 mm, surface roughness Ra < 0.8 μm for metal seals
Test Method
Helium leak detection per ASTM E493, pressure decay testing, mass spectrometer leak detection

Buyer Feedback

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Frequently Asked Questions

What is the difference between KF and ISO vacuum flanges?

KF (Quick Flange) flanges use a clamp and O-ring seal for quick assembly in small to medium sizes (up to DN 50), while ISO flanges use bolted connections with larger O-rings or metal gaskets for bigger systems (DN 63 to DN 500).

How do you prevent leaks in vacuum flanges?

Ensure clean, undamaged sealing surfaces; use correct gasket material for the vacuum level and temperature; apply proper torque in a star pattern for bolted flanges; and perform leak testing with helium mass spectrometers.

Can vacuum flanges be reused?

Metal gaskets (copper) are typically single-use, while elastomer O-rings can be reused if undamaged. Always inspect sealing surfaces and replace gaskets during maintenance to prevent leaks.

Can I contact factories directly?

Yes, each factory profile provides direct contact information.

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