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Swagelok VCR Male Unions

Swagelok VCR Male Unions

Swagelok VCR Male Unions: High-Integrity Face-Seal Solutions for Low-Pressure and UHV Applications

Swagelok VCR Male Unions from TFM are precision-engineered fittings designed to connect two female VCR components with absolute sealing integrity. Utilizing Swagelok’s signature metal gasket face-seal technology, these unions are ideal for low-pressure gas systems and ultra-high vacuum (UHV) environments where leak-tight performance, chemical compatibility, and thermal stability are essential.

Constructed from 316L stainless steel, Swagelok VCR Male Unions accommodate either stainless steel or copper gaskets, providing optimal versatility across a broad range of analytical, semiconductor, and scientific gas handling systems.

Key Features of Swagelok VCR Male Unions:

  • Metal Gasket Face-Seal Design
    Delivers leak-tight, elastomer-free sealing between male VCR ends and female face-seal fittings, ensuring gas purity and long-term reliability.

  • UHV Compatibility
    Rated for vacuum levels down to 10⁻⁹ Torr, these fittings meet the demands of mass spectrometry, helium leak testing, and cleanroom-grade gas routing.

  • High-Temperature Resistance

    • Operates up to 538°C with stainless steel gaskets, enabling bakeout-ready performance in vacuum chambers and hot gas environments.

    • With copper gaskets, supports stable sealing up to 204°C, suitable for most industrial and laboratory gas applications.

  • Straight Male-to-Male Configuration
    Provides a compact connection between two female VCR fittings in inline configurations, with minimal dead volume and robust mechanical strength.

  • Material and Build Quality
    Machined from 316L stainless steel, offering excellent corrosion resistance, high-purity compatibility, and repeatable sealing for demanding installations.

Common Applications:

  • Connecting gas lines from lecture bottles or pressure regulators

  • Inline sealing in UHV manifolds and analytical instruments

  • Helium leak-check and purge gas setups in research environments

  • Direct male-to-female component transitions in clean gas panels

  • System upgrades requiring compact, repeatable metal seal fittings

TFM complements these Swagelok VCR Male Unions with a full range of VCR-compatible components, including female unions, tee and elbow connectors, weld adapters, gaskets, and nut assemblies, helping you build or maintain world-class vacuum and gas delivery systems.

Ordering Table

Swagelok VCR Male Unions

Reference Material Tube OD 1 Tube OD 2 Part Number
VCR Double Male Union Stainless Steel 1/8" 1/8" 2MVCR-2MVCR
VCR Double Male Union Stainless Steel 1/4" 1/4" 4MVCR-4MVCR
VCR Double Male Union Stainless Steel 1/2" 1/2" 8MVCR-8MVCR
VCR Double Male Reducing Union Stainless Steel 1/8" 1/4" 2MVCR-4MVCR
VCR Double Male Reducing Union Stainless Steel 1/4" 1/2" 4MVCR-8MVCR
VCR Male Bulkhead Union Stainless Steel 1/4" 1/4" 4MVCR-BU
VCR Male Bulkhead Union Stainless Steel 1/2" 1/2" 8MVCR-BU

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FAQ

Tube fittings are designed for tubes (measured by outside diameter and wall thickness) used in high-pressure and instrumentation applications, whereas pipe fittings are for pipes (identified by nominal pipe size) primarily used in fluid transport.

 

Common valve types include ball valves, gate valves, check valves, butterfly valves, and globe valves. Each serves a specific function—from quick shutoff (ball/gate valves) to flow regulation (globe valves).

 

  • For tubing, measure the outside diameter; for pipes, refer to the nominal pipe size (using conversion charts if needed). Always match the valve or fitting size to your pipe’s dimensions and flow requirements.

  • Frequently used thread types include NPT (National Pipe Tapered), BSP (British Standard Pipe), and UNC, along with slip-fit options that rely on compression or fusion rather than threads.

Interchangeability depends on manufacturer specifications and certification. Always verify compatibility via manufacturer guides or certified interchangeability charts.

 

  • A coupling is a short, straight fitting used to join two pipes or tubes. It provides a secure, leak-tight connection and can sometimes serve to extend or repair piping runs.

Consider valve type, pressure and temperature ratings, material compatibility with your fluid, actuation method (manual or automatic), and maintenance requirements.

 

  • Valves regulate flow by opening, closing, or partially obstructing the pathway. Their mechanisms (such as the rotation of a ball or the linear movement of a gate) determine the speed and precision of flow control.

  • A flange is a flat, circular component used to connect pipes, valves, or other equipment. Bolted together with gaskets, flanges provide a secure, leak-proof joint that facilitates both assembly and maintenance.

  • Manual valves require physical operation via handles or levers, whereas actuated valves use mechanisms—pneumatic, electric, or hydraulic—to open and close automatically or remotely.

  • Issues include leaks caused by improper installation, over-tightening, degraded seals, material incompatibility, and fatigue from repeated cycling. Regular inspection and proper installation practices help mitigate these problems.

Regular maintenance involves periodic inspections, cleaning or replacing worn seals, ensuring proper torque during installation, and adhering to manufacturer guidelines and local plumbing codes to preserve system integrity.

 

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