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Nuclear Spiral Wound Gasket

Nuclear Spiral Wound Gasket

Kaxite's Nuclear Spiral Wound Gasket ensures unbeatable sealing performance in demanding nuclear applications, crafted with advanced materials and precision engineering for long-lasting reliability. Ideal for nuclear industry professionals, it delivers peace of mind by preventing leaks and enhancing safety, setting a new standard in durability and compliance.
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Nuclear Spiral Wound Gasket – zero-leakage sealing solution engineered for nuclear power plants and critical safety-class applications. Manufactured in China by Kaxite, these advanced gaskets combine stainless steel fixed rings with nuclear-grade flexible graphite sealing elements, delivering uncompromising reliability under extreme temperature fluctuations and pressure cycling.

Leakage Rate: ≤1×10⁻⁷ Pa·m³/s
Max Temperature: 650°C (steam)
Max Pressure: Class 2500
Compliance: ASME, GB, EN, JIS, HG

Product Overview

Nuclear Spiral Wound Gasket (KXT610 Series) is a high-integrity sealing component specifically designed for nuclear safety-class applications requiring absolute leak-tightness. The gasket consists of precision-machined stainless steel fixed inner and outer rings combined with specially formulated nuclear-grade flexible graphite sealing rings. This innovative design delivers zero-leakage performance in environments subject to sudden temperature changes and pressure fluctuations – conditions commonly encountered in nuclear reactor primary loops, steam systems, and safety-related piping.

As a leading China spiral gasket factory with specialized nuclear manufacturing capabilities, Kaxite produces these gaskets to the most stringent quality standards. Each unit is manufactured with full material traceability, documented inspection records, and compliance with applicable nuclear codes. Our industrial gaskets wholesale program provides nuclear plant operators, EPC contractors, and maintenance service providers with reliable supply chain solutions.

Key Features & Performance Characteristics

Zero Leakage Performance

Leakage rate ≤1×10⁻⁷ Pa·m³/s – meets nuclear safety-class sealing requirements

Extreme Temperature Tolerance

Up to 450°C in oxidizing media; up to 650°C in steam service

High Pressure Capability

Rated PN420 or Class 2500 – suitable for primary and secondary nuclear systems

316L Stainless Steel Rings

Fixed inner and outer rings resist corrosion and maintain structural integrity

Nuclear-Grade Graphite

Specialized flexible graphite sealing rings with low chloride and low sulfur content

Full Standard Compliance

ASME B16.20, GB/T 19066, EN, JIS, HG – available in all standard flange configurations

Technical Specifications

Pressure Rating PN ≤ 420 / Class ≤ 2500
Nominal Diameter DN ≤ 600 / NPS ≤ 24
Leakage Rate ≤ 1×10⁻⁷ Pa·m³/s
Temperature (Air/Oxidizing) ≤ 450°C
Temperature (Steam) ≤ 650°C
Standard Thickness 4.4 mm, 6.6 mm, 10 mm
Ring Material 304 / 316L Austenitic Stainless Steel
Sealing Element Nuclear-grade Flexible Graphite

Typical Nuclear Applications

The KXT610 Nuclear Spiral Wound Gasket provides the most effective sealing and highest reliability assurance for nuclear safety-level applications:

  • ▸ Reactor primary cooling system piping and flanged connections
  • ▸ Steam generator primary and secondary side flanges
  • ▸ Nuclear safety-class valves and pressure vessel penetrations
  • ▸ High-temperature steam systems – main steam and feedwater lines
  • ▸ Boric acid recirculation and chemical volume control systems
  • ▸ Spent fuel cooling and reprocessing facility piping
  • ▸ Containment penetration seals and isolation valves

Media compatibility includes cooling water, steam, boric acid, air, nitrogen, demineralized water, oil, oxygen, 30% sodium hydroxide solution, and 7% nitric acid solution. For other media, consult our engineering team for material compatibility verification.

Quality Assurance & Compliance

As a certified nuclear spiral wound gasket supplier, Kaxite maintains rigorous quality controls in accordance with international nuclear standards. Our manufacturing processes are documented and traceable, with each gasket accompanied by comprehensive inspection reports including:

  • • Raw material certificates with full chemical and mechanical analysis
  • • Dimensional inspection reports with traceable measurement records
  • • Flexible graphite lot testing – chloride, sulfur, and leachable ion content
  • • Leakage rate testing per applicable nuclear standards
  • • Complete documentation packages for quality records and regulatory compliance

Our gaskets conform to ASME B16.20, GB/T 19066, EN 1591, JIS B2404, and HG/T 20631 standards, and can be manufactured to non-standard raised flange, tongue-and-groove flange, or groove flange dimensions upon request.

Why Choose Kaxite – Your China Nuclear Spiral Gasket Manufacturer

Kaxite brings over a decade of specialized gasket manufacturing experience to the nuclear industry, with dedicated production lines and quality systems for safety-class sealing components. Our factory-direct wholesale pricing and flexible production capacity support both scheduled outages and emergency replacements. We offer full technical documentation packages, third-party inspection coordination, and responsive customer support. Exported to nuclear facilities in over 20 countries, Kaxite is a trusted partner for nuclear spiral wound gasket procurement worldwide.

Ordering & Supply Information

Kaxite provides dedicated supply chain support for nuclear-grade gasket requirements:

  • MOQ: Flexible – project-specific quantities and emergency replacements accommodated
  • Lead Time: 15–25 days for standard sizes; custom specifications 20–30 days
  • Custom Options: Non-standard dimensions, special flange configurations, material certifications
  • Documentation: Full EN 10204 3.1/3.2 certificates, NDE reports, dimensional inspection records
  • Shipping: Priority handling for nuclear applications – sea, air, or dedicated logistics solutions

Need a free sample for qualification or a detailed technical proposal? Our nuclear sales team responds within 24 hours with comprehensive quotations and engineering support.

Frequently Asked Questions (FAQ)

▶ What makes Nuclear Spiral Wound Gaskets different from standard spiral wound gaskets?
Nuclear Spiral Wound Gaskets are manufactured with stricter material controls, enhanced quality documentation, and specialized nuclear-grade graphite sealing elements. They feature fixed inner and outer stainless steel rings for pressure retention and resistance to thermal cycling. Key differentiators include leakage rates as low as 1×10⁻⁷ Pa·m³/s, chloride/sulfur-controlled graphite, and full material traceability – all essential for nuclear safety-class applications.
▶ What materials are used in Nuclear Spiral Wound Gaskets?
Our nuclear gaskets feature 304 or 316L austenitic stainless steel for both inner and outer fixed rings, ensuring corrosion resistance and structural integrity. The sealing element is manufactured from nuclear-grade flexible graphite with stringent quality controls on chloride content (≤20 ppm), sulfur content (≤50 ppm), and leachable ion levels. Alternative ring materials can be supplied upon request.
▶ What media can Nuclear Spiral Wound Gaskets handle?
The KXT610 series is compatible with a wide range of nuclear plant media including cooling water, steam (up to 650°C), boric acid, air, nitrogen, demineralized water, oil, oxygen, 30% sodium hydroxide solution, and 7% nitric acid solution. The flexible graphite sealing element provides excellent chemical resistance and thermal stability across these diverse service conditions.
▶ What standards do Kaxite Nuclear Spiral Wound Gaskets comply with?
Our gaskets are manufactured to ASME B16.20, GB/T 19066, EN 1591, JIS B2404, and HG/T 20631 standards. We can also produce to non-standard raised flange, tongue-and-groove flange, or groove flange dimensions. Contact our engineering team to discuss your specific flange standard requirements.
▶ What documentation is provided with nuclear-grade gasket shipments?
As a certified nuclear spiral gasket factory, Kaxite provides comprehensive documentation including EN 10204 3.1 material certificates, dimensional inspection reports with traceable measurements, flexible graphite test certificates (chloride/sulfur content), leakage test reports, and complete quality records. Third-party inspection (SGS, TÜV, Bureau Veritas) can be arranged upon request.
▶ How can I request a quote or order Nuclear Spiral Wound Gaskets?
Requesting a quote or placing an order is straightforward:

Option 1: Complete the inquiry form below with your size, flange standard, pressure class, and quantity.

Option 2: Email our nuclear team directly with your specifications and documentation requirements.

Option 3: Call our sales office for immediate assistance with urgent nuclear requirements.

All inquiries are responded to within 24 hours with detailed quotations and technical data sheets.

★ Trusted China Nuclear Spiral Wound Gasket Manufacturer – Request Your Quote

Contact Kaxite for competitive wholesale pricing, full documentation, and expert engineering support for your nuclear application.

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