Overview

This document provides comprehensive technical specifications for the 5L series of stainless steel high-pressure unions and various stainless steel tube fittings designed for demanding industrial applications including semiconductors, offshore/onshore, fuel cells, and bio/pharmaceutical industries. It covers materials, construction, operating parameters, product types, thread standards, certifications, installation guidelines, and optional treatments.

Material and Construction

• Material: Stainless steel 1.4571 (equivalent to AISI 316 Ti), compliant with DIN EN 10216-5.
• Design: Compact, corrosion-resistant, vibration-resistant with minimal dead space.
• Assembly: Features tightening limitation for robust mounting and radial dismounting capability.

Operating Parameters

• Working Pressure: 200 to 400 bar static, with a safety factor of 4.
• Temperature Range: -110°C to +300°C.
• Leak Rate: Helium leak rate of 10^-8 mbar·l/s under proper assembly.
• Vacuum Capability: Down to 10^-6 mbar.

Tubes Compatibility

• Seamless precision stainless steel tubes per DIN EN 10216-5 / EN ISO 1127, tolerance class T4.
• Tube outside diameter tolerance: ±0.1 mm.
• Clean and smooth surface required.
• Other materials available upon request.

Certifications and Approvals

• Certificates: EN 10204 2.2 including material specifications.
• Approvals: DVGW-Gas, SVGW-Gas, ECE/324/Reg.110 for CNG vehicle components.

Thread Standards

• Adaptor stems and threads available in BSP (DIN 3852), NPT (ANSI/ASME B1.20.1-1983), and UNF/UN (SAE 514) standards.
• Thread types include tapered (Form C), cylindrical (Form B), and sealing edge (Form E).

Product Range and Types

The product range includes multiple union types with detailed SOL numbers and descriptions:

• Nut Connection (5L.3, SOL 50021): Connection nuts for metric and inch tubes, pressure ratings up to 400 bar.
• Straight Union (5L.3, SOL 51021): Double unions for metric and inch tubes, pressure ratings 200-400 bar.
• Male Adaptor Unions (5L.4 to 5L.7, SOL 51121 series): BSP tapered, NPT, and metric parallel thread variants.
• Other types: Female adaptor unions, tube stubs, adjustable couplings, weld-on unions, panel mount unions, reduction unions, elbow unions, banjo unions, tee and cross unions, and adjustable variants.

Technical Data Tables

Detailed dimensional and specification tables include:

• Tube outside diameter (d)
• Thread size and type (M, R, RNPT, G, Mz)
• Pressure ratings (bar)
• Wrench sizes (SW1, SW2)
• Length dimensions (L, a, z, e)
• Weight per 100 units (kg/100)

These enable precise product selection for both metric and inch tube sizes.

Optional Treatments and Services

• Oxygen service special treatments.
• Silicone-free special treatment.
• Degreasing and special cleaning.
• Pre-coated threads with Loctite 5061.
• Dry lubricated nuts.

Installation and Quality Notes

• Proper assembly is critical to achieve specified leak rates and performance.
• Reference appendices for tubes and installation instructions (pages a.6 and a.21).

Summary of Critical Information

• Material: Stainless steel 1.4571 (AISI 316 Ti equivalent).
• Pressure: Up to 400 bar static with 4x safety factor.
• Temperature: -110°C to +300°C.
• Leak tightness: Helium leak rate 10^-8 mbar·l/s.
• Thread standards: BSP, NPT, UNF/UN.
• Wide product range covering various union types and sizes for metric and inch tubes.
• Optional special treatments for specific applications.

Technical Summary of Stainless Steel Tube Fittings

1. Product Types and Descriptions

• Male Adaptor Unions with FPM O-Ring Seal (SOL 51124 OR)
• Female Adaptor Unions (SOL 51221)
• Tube Stubs (SOL 51300, SOL 51304)
• Adjustable Couplings (SOL 51325, SOL 51326)
• Weld-on Unions (SOL 51429)
• Panel Mount Unions (SOL 51521, SOL 51524) for panel thickness up to 5 mm and 16 mm
• Adjustable Male Adaptor Assemblies (SOL 51625)
• Reduction Fittings and Assemblies (SOL 51821, SOL 51825)
• Elbow Unions (SOL 52021)
• Male Adaptor Elbow Unions including NPT versions (SOL 52421, SOL 52421 NPT)

2. Material and Construction

All fittings are stainless steel with corrosion resistance and durability. Fittings with O-ring seals use FPM (fluoroelastomer) for leak-proof connections.

3. Thread Types and Standards

• BSP Cylindrical (G) for metric tubes.
• BSP Tapered (R) for male adaptor fittings.
• NPT tapered threads for specific elbow unions.

4. Key Parameters and Dimensions

• Tube outside diameter (d or Ad)
• Minimum bore diameter (e)
• Installed length (L)
• Wrench sizes (SW1, SW2, SW3)
• Additional dimensions (l, b, a, z, z1, panel thickness limits, thread sizes)
• Pressure ratings typically 200-400 bar depending on fitting and size
• Weight per 100 pieces for logistics

5. Installation and Assembly Notes

• Stiffener sleeves (SO 50003) must be ordered separately for some fittings.
• Panel mount unions have maximum panel thickness limits (5 mm or 16 mm).
• Adjustable couplings and male adaptor assemblies allow orientation adjustment during installation.

6. Language and Terminology

Multilingual terminology (German, French, English) supports international use.

7. Summary of Critical Information

• Material: Stainless steel with FPM O-ring seals where applicable.
• Pressure Ratings: 200 to 400 bar depending on fitting size and type.
• Thread Standards: BSP cylindrical (G), BSP tapered (R), and NPT.
• Dimensions: Detailed for compatibility and installation.
• Accessories: Stiffener sleeves ordered separately.
• Installation Limits: Panel thickness restrictions for panel mount unions.

8. Practical Recommendations

• Verify thread compatibility before ordering.
• Order stiffener sleeves separately when required.
• Use correct wrench sizes to avoid damage.
• Confirm pressure ratings meet system requirements.
• Consider minimum bore sizes to maintain flow capacity.

Additional Product Types and Specifications

• Adjustable Elbow Union (SOL 52621) for metric and inch tubes with pressure ratings 250-400 bar.
• Adjustable Elbow Assembly (SOL 52625) pre-assembled with specified dimensions.
• Panel Mount Union (SOL 52721) for panel thickness up to 20 mm.
• Single Banjo (SOL 52824) swivel elbow fittings with BSP straight threads.
• Tee Union (SOL 53021) standard T-shaped unions.
• Adjustable L Union and Tee Union (SOL 53621 series) requiring stiffener sleeves.
• Cross Union (SOL 54021) four-way fittings.

Technical Specifications Summary

Conclusion

This document is a detailed technical reference for selecting, specifying, and installing stainless steel tube fittings for hydraulic and pneumatic systems. It provides essential dimensional data, pressure ratings, thread standards, and ordering information. Users are advised to pay attention to required accessories such as stiffener sleeves and adhere strictly to installation guidelines to ensure optimal performance and leak-tight connections.