Swagelok SS-8BK-1O is a stainless steel bellows-sealed valve designed to isolate system fluids and achieve reliable, leak-tight performance. This valve features a packless design with a welded seal, making it ideal for applications where the seal to atmosphere is critical. This specific configuration includes a 1/2 inch Swagelok tube fitting connection and is equipped with a 1 series normally open pneumatic actuator.

Technical Specifications

Specification	Detail
Actuator Model	1 Series
Operation Mode	Normally Open Spring Return
Actuator Type	Pneumatic
Bellows Material	321 Stainless Steel
Body Material	316 Stainless Steel
Body Seal	Gasket with soft seat (PCTFE Stem Tip)
Cleaning	Special Cleaning and Packaging (SC-11)
Connection Size	1/2 in. Swagelok® Tube Fitting
Flow Coefficient (Cv)	0.96
Flow Pattern	Straight (2-way)
Pressure Rating	500 PSIG @ 100°F / 34.4 BAR @ 37°C
Temperature Rating	-20°F to 200°F (-28°C to 93°C)
Testing	Helium leak testing according to SCS-00020

Performance and Design

Swagelok bellows valves use a packless design and a welded seal to ensure atmospheric integrity in general and high-purity service. The straight-pattern design combined with a conical PCTFE stem tip provides consistent shut-off performance. This model is SC-11 cleaned to meet stringent system cleanliness requirements.

Application Note

Bellows valves are ideal for critical applications where atmospheric leakage must be eliminated. For safe product selection, consider the total system design, including material compatibility and pressure/temperature ratings.

Safety Information

Do not mix or interchange Swagelok products or components with those of other manufacturers. System designers must ensure adequate ratings and proper installation for safe performance.