Swagelok SS-4BK-VCR-VP-1CM-2 316 Stainless Steel Bellows Sealed Valve

Swagelok SS-4BK-VCR-VP-1CM-2 is a high-purity, packless bellows-sealed valve designed for applications requiring absolute system integrity and freedom from leakage. Manufactured from 316 stainless steel, this valve features a metal diaphragm-to-body seal and utilizes a seamless metal bellows to provide a positive, stem-seal-less barrier to the atmosphere.

This particular model is equipped with VCR® face-seal fittings on both ends, which are the industry standard for creating high-integrity, all-metal seals in critical gas and ultra-high-purity (UHP) systems . It also includes a position indicator for visual confirmation of the valve stem position and a panel mount nut for secure installation in analytical and process panels.

Key Features & Benefits

Packless Bellows Seal Design: The seamless metal bellows hermetically seals the process fluid from the environment, eliminating the leak path associated with traditional stem packing . This is critical for handling toxic, hazardous, or expensive fluids.

High-Purity VCR® Connections: The integral female VCR ports (typically 1/2 in. VCR) allow for a face-seal connection with a metal gasket, ensuring minimal entrapment areas and exceptional leak integrity down to 4 x 10⁻⁹ std cm³/s He . This makes it ideal for semiconductor, analytical, and high-purity process applications .

Non-Rotating Stem Tip: The stem tip does not rotate against the seat during closure, reducing wear, particulate generation, and ensuring reliable, repeatable shutoff.

316 Stainless Steel Construction: Provides excellent corrosion resistance and durability in demanding environments.

Integrated Position Indicator & Panel Mount: The -VP (Visual Position Indicator) allows operators to quickly see if the valve is open or closed. The -1CM-2 suffix typically indicates a specific handle configuration and the inclusion of a panel mounting nut for secure installation on a panel or bracket.

Technical Specifications (SS-4BK-VCR-VP-1CM-2)

Specification Detail

Manufacturer Swagelok

Part Number SS-4BK-VCR-VP-1CM-2

Product Type Bellows-Sealed Valve (Packless)

Material 316 Stainless Steel

Connection Type Female VCR® Face-Seal Fittings

Connection Size Typically 1/2 in. VCR (compatible with 1/2 in. VCR glands and gaskets)

Features Visual Position Indicator (-VP), Panel Mount Nut (-1CM-2)

Pressure Rating High vacuum to 600 psig (41.3 bar) (Always verify with current Swagelok catalog for specific temperature and model)

Temperature Rating Up to 482°F (250°C) (Always verify with current Swagelok catalog for specific model)

Orifice Size Typically 0.172 in. (4.4 mm) for the BK series

Flow Coefficient (Cv) Typically 0.28

Applications

The SS-4BK-VCR-VP-1CM-2 is specifically designed for systems where leak integrity and purity are paramount:

Semiconductor Fabrication: In gas cabinets, tool hookups, and process gas lines.

Analytical Instrumentation: Gas chromatography, sample handling systems, and research equipment .

Biopharmaceutical: For sterile processes and critical fluid handling.

High-Vacuum Systems: The packless design is ideal for maintaining vacuum integrity .

Specialty Gas Handling: For corrosive, toxic, or pyrophoric gases.

Understanding the Part Number

SS: 316 Stainless Steel material.

4BK: Bellows valve series (BK) with a specific body pattern and orifice size.

VCR: Indicates the valve has integral female VCR face-seal fitting ends .

VP: Visual Position Indicator.

1CM-2: Indicates a specific handle type (often a round handle) and the inclusion of panel mounting hardware.

Why Choose Genuine Swagelok?

Selecting genuine Swagelok components like the SS-4BK-VCR-VP-1CM-2 is essential for maintaining system safety and reliability. Swagelok's VCR components are tested to the most rigorous industry standards and are fully traceable. Mixing VCR components from different manufacturers is not recommended and can compromise seal integrity .

Ordering Information

For purchasing, pricing, and availability of the Swagelok SS-4BK-VCR-VP-1CM-2, please contact your local authorized Swagelok sales and service center. Be prepared to provide the full part number for accurate quoting.

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