Structured Manufacturing Data (2026)

Cryogenic Seal

Based on aggregated insights from structured factory profiles within the CNFX directory, the standard Cryogenic Seal 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 Cryogenic Seal is characterized by the integration of Sealing Lip and Spring Energizer. In industrial production environments, manufacturers listed on CNFX commonly emphasize Polytetrafluoroethylene (PTFE) construction to support stable, high-cycle operation across diverse manufacturing scenarios.

A specialized sealing component designed to maintain integrity and prevent leakage in cryogenic environments within precision injection systems.

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Product Specifications

Technical details and manufacturing context for Cryogenic Seal

Definition
A cryogenic seal is a critical component of a Precision Injection Valve, engineered to create and maintain a reliable barrier against fluid or gas leakage under extreme low-temperature conditions, typically below -150°C. It ensures the valve's operational precision by preventing contamination, maintaining pressure differentials, and protecting sensitive internal components from thermal stress and environmental ingress.
Working Principle
The seal functions by maintaining physical contact and compression between mating surfaces, utilizing materials and designs that remain flexible and resilient at cryogenic temperatures. It compensates for thermal contraction of valve components, preventing gaps that could lead to leaks, while withstanding the thermal cycling and potential embrittlement associated with cryogenic fluid handling.
Common Materials
Polytetrafluoroethylene (PTFE), Perfluoroelastomer (FFKM), Specialty Metal Alloys
Technical Parameters
  • Primary sealing diameter or cross-section critical for fit and function within the valve assembly. (mm) Standard Spec
Components / BOM
  • Sealing Lip Part
    Primary contact surface that creates the leak-tight barrier against the valve seat or mating surface.
    Material: PTFE or FFKM
  • Spring Energizer Part
    Provides constant outward force to maintain seal contact and compensate for thermal contraction of components.
    Material: Stainless Steel or Inconel
  • Anti-Extrusion Ring Part
    Prevents the softer sealing material from being forced into gaps under high pressure.
    Material: Metal Alloy

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Cryogenic Seal.

cryogenic seal for injection molding machines PTFE cryogenic sealing components FFKM seals for low temperature applications anti-extrusion ring cryogenic seal spring energized cryogenic seals

Applied To / Applications

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

Precision Injection Valve
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Industrial Ecosystem & Supply Chain Structure

Complementary Systems
Downstream Applications
Specialized Tooling

Application Fit & Sizing Matrix

Operational Limits
pressure: Up to 1000 bar (static), 500 bar (dynamic)
flow rate: 0-10 L/min (dependent on seal design and system)
temperature: -269°C to +200°C
slurry concentration: Not recommended for abrasive slurries; maximum 5% solids by volume for non-abrasive particles
Media Compatibility
✓ Liquid nitrogen (LN2) ✓ Liquid helium (LHe) ✓ Cryogenic hydrocarbons (e.g., LNG)
Unsuitable: High-temperature oxidizing environments (e.g., above 200°C with oxygen present)
Sizing Data Required
  • Shaft/Bore Diameter (mm)
  • Operating Temperature Range (°C)
  • System Pressure (bar)

Reliability & Engineering Risk Analysis

Failure Mode & Root Cause
Thermal fatigue cracking
Cause: Repeated thermal cycling between cryogenic and ambient temperatures causing differential expansion and stress concentration in seal materials
Seal material embrittlement
Cause: Exposure to extreme low temperatures below material's ductile-to-brittle transition point, leading to loss of flexibility and fracture under operational stresses
Maintenance Indicators
  • Visible frost or ice accumulation on seal exterior indicating cryogenic fluid leakage
  • Audible hissing or whistling sound from seal area suggesting gas escape under pressure
Engineering Tips
  • Implement gradual cooldown/warmup procedures to minimize thermal shock, using controlled temperature ramps of ≤50°C per hour
  • Select seal materials with certified cryogenic performance (e.g., PTFE composites, specific elastomers) and verify compatibility with both temperature extremes and process fluids

Compliance & Manufacturing Standards

Reference Standards
ISO 21029-1: Cryogenic vessels - Transportable vacuum insulated vessels of not more than 1000 litres volume ASTM F2150: Standard Guide for Characterization and Testing of Biomaterial Scaffolds Used in Tissue-Engineered Medical Products (relevant for cryogenic seal materials) CE marking under Pressure Equipment Directive (PED) 2014/68/EU for components in cryogenic pressure systems
Manufacturing Precision
  • Surface finish: Ra ≤ 0.8 μm for sealing surfaces
  • Concentricity: ≤ 0.05 mm TIR between sealing surfaces and mounting features
Quality Inspection
  • Helium leak test at cryogenic temperatures (typically <10⁻⁸ mbar·L/s)
  • Thermal cycling test between ambient and cryogenic operating temperatures (e.g., 77K for LN₂)

Factories Producing Cryogenic Seal

Manufacturer profiles with relevant production capability in China

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Manufacturer listings support early research and capability understanding. They are not certification, ranking, or transaction guarantees.

Technical documentation
4/5
Manufacturing capability
4/5
Inspection readiness
5/5
Supplier transparency
3/5

These scores are example evaluation dimensions, not real customer ratings, country-specific buyer feedback, or live inquiry activity.

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Frequently Asked Questions

What materials are best for cryogenic seals in injection systems?

PTFE offers excellent chemical resistance, FFKM provides superior elasticity at low temperatures, and specialty metal alloys ensure durability in extreme cryogenic environments.

How does the spring energizer work in cryogenic seals?

The spring energizer maintains constant sealing force against the shaft or housing, compensating for material contraction and thermal cycling in cryogenic conditions to prevent leakage.

What applications require cryogenic seals in machinery manufacturing?

Precision injection systems for liquefied gases, cryogenic cooling equipment, semiconductor manufacturing tools, and medical device production where temperature extremes demand reliable sealing solutions.

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.

Data basis: CNFX manufacturer profiles, technical classification, publicly available product information, and ongoing plausibility checks for Machinery and Equipment Manufacturing.

Data Basis

CNFX manufacturer profiles, technical classification, publicly available product information, and ongoing plausibility checks.

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.

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