Bellows-Sealed Valves

Deliver superior sealing performance and extended service life

FITOK bellows-sealed valves deliver superior sealing performance and extended service life, with a pressure range from 500 psig to 3500 psig and a helium leak rate of ≤ 4×10-9 std cm3/s. These valves are available in multiple connection types and sizes, with options for panel or bottom mounting and manual or pneumatic actuation. Ideal for applications requiring high leak-tightness, they are used to isolate system media and prevent leaks, making them suitable for both general industry and high-purity applications.

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  • General Service Bellows-Sealed Valves, SW Series

    Stainless steel or brass valve body supports working pressures up to 1000 psig (69.0 bar) and a working temperature range from -20°F to 842°F (-28°C to 450°C). The hydraulic-formed multilayer bellows ensure excellent sealing and a longer cycle life. The externally pressurized bellows design enhances pressure containment capacity. The non-rotating stem tip eliminates galling within the seat area. The bellows and stem tip assembly are replaceable, and options for regulating, conical, and spherical stem tips are available. Manual and pneumatic actuation are offered.

  • Secondary Packed Bellows-Sealed Valves, SU Series

    Stainless steel valve body supports working pressures up to 2500 psig (172 bar) and a working temperature range from -20°F to 842°F (-28°C to 450°C). The hydraulic-formed multilayer bellows, combined with upper packing above the bellows, provide a secondary containment system that ensures excellent sealing and longer cycle life. The non-rotating stem tip reduces galling. Bellows and stem tip assemblies are replaceable, with regulating, conical, and spherical tip options. Manual and pneumatic actuation are available.

  • Low Pressure Bellows-Sealed Valves, SM Series

    316 SS, 316L SS or 316L SS VAR valve body supports working pressures up to 500 psig (34.4 bar) and a working temperature range from -40°F to 400°F (-40°C to 204°C), depending on seat material. These valves feature both manual and pneumatic actuator options, with the pneumatic actuator offering 360° rotation for ease of installation. A metal-to-metal gasket seal ensures no external leakage, and precision-formed metal bellows ensure reliable performance. The non-rotating stem tip increases shutoff cycle life.

  • High Pressure Pneumatic Bellows-Sealed Valves, SVH Series

    316 SS or 316L SS valve body supports working pressures up to 3500 psig (241 bar) and a working temperature range from -40°F to 400°F (-40°C to 204°C), depending on seat material. They come with pneumatic closed and pneumatic open actuator options. These valves feature a compact body design that minimizes dead space. The 316L stainless steel precision-formed bellows ensure long cycle life, while PCTFE stem tips offer exceptional chemical and thermal resistance. SM/AVH series are available with wetted surface roughness, cleaning, and packaging processes that meet high-purity and ultra-high-purity application standards.

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