Description
Technical Data: Stainless Steel Packless Pull-Out Assembly
1. Functional Purpose
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Application: Primarily used in HVAC/R systems for compressor maintenance (just like the brass model).
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Core Function: Allows for the pull-out and service of the compressor without disconnecting the main refrigerant lines.
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Key Advantage (over Brass): Superior corrosion resistance (especially to chlorides and moisture) and higher tensile strength, making it ideal for marine, coastal, and harsh industrial environments.
2. Materials of Construction
The materials are the defining feature of this assembly.
| Component | Material | Notes |
| Flexible Tube | Stainless Steel (Corrugated Tubing) | Provides high strength, superior corrosion resistance, and excellent flexibility. (Typically AISI 304 or 316 grade.) |
| Protective Braid | Stainless Steel Wire Braid | Matches the tube’s corrosion resistance and provides high tensile strength for maximum pressure rating. |
| End Connections | Brass Fittings or Stainless Steel/Copper | Often features brass flare connections or copper ends for brazing to system lines for compatibility, but the flexible core is fully stainless steel. |
| Weld Method: | Electrically Welded | Often used for a stronger, more reliable joint than traditional brazing, which is common with brass. |
3. Pressure and Performance Ratings
The pressure ratings for the stainless steel assemblies are generally consistent with or slightly higher than the brass models, particularly in the smaller sizes.
| Rating Type | Standard Value (Imperial) | Standard Value (Metric) |
| Maximum Working Pressure (MWP) | 650 psig | 45 bar |
| Minimum Burst Pressure | 3250 psig | 224 bar |
| Safety Factor | 5:1 (Burst Pressure / Working Pressure) | Standard industry safety factor. |
| Refrigerant Compatibility | Compatible with all refrigerants (CO2, HC, HFO, HFC, HCFC, CFC, etc.). |
4. Standard Specifications & Dimensions
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Standard Sizes (Coupler): Generally available in larger sizes than brass: 3/8”, 1/2”, and 5/8” SAE Flare. (Note: 1/4” may be less common for SS pull-out assemblies).
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Standard Lengths: 36 inches (approx. 914 mm) and 48 inches (approx. 1219 mm).
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Connection Configuration (Most Common): MF (Male-Female): SAE Male Flare and SAE Female Flare Swivel. (Designated by an ‘S’ prefix, e.g., S8-MF-36).
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