Bellow valves
Products ensure complete external tightness, thanks to the gland zone, which is permanently separated from the flowing medium. Bellow valve limits or stops any kind of leakage that could lead to a facility damage, as well as cause harm to the environment. These products do not require a constant supervision over the way they operate, remaining maintenance-free and easy-to-use.
ZETKAMA offers bellow valves, including stop models, as well as the ones with a throttle plug for the highest efficiency. Additionally, for products made of cast steel, we prepared stop check versions. The well-thought-out design allows the use of these products in various types of installations, including industrial water, diathermic oil, steam, compressed air, power engineering, heating and air conditioning.
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What makes bellows sealed valves reliable?
Bellow valves, also known as bellows sealed valves, are engineered to deliver zero stem leakage in demanding industrial environments. Designed with a double-wall bellows system, these valves are a reliable solution for applications where sealing integrity and environmental safety are critical. Zetkama’s zBEL series is specifically developed for precise flow control and shut-off in high-pressure and high-temperature systems, offering robust construction and long service life.
Technical capabilities of bellow valves
The zBEL series of bellow seal control valves is available in nominal diameters from DN 15 to DN 250 and pressure classes PN 16, 25, and 40. Suitable for operating temperatures from -60°C up to +450°C (depending on model and material), these valves meet the requirements of industries that demand performance under extreme conditions. Body materials include grey cast iron, ductile iron, cast steel, and stainless steel, with connections available in both flanged and welded variants. All models conform to EN standards and are CE-marked under the Pressure Equipment Directive for sizes DN ≥ 32.
Material selection and sealing performance
Zetkama bellow valves are built for long-term reliability. The stainless steel bellows (X6CrNiMoTi17-12-2) ensure hermetic sealing, effectively preventing any stem leakage. Graphite packing and CrNiSt gaskets deliver excellent thermal and chemical resistance, while options for stainless steel or stellited seats and discs extend durability. These materials guarantee resistance to corrosion, thermal cycling, and aggressive media—making zBEL valves a trusted component in mission-critical systems.
Applications of bellows sealed valves
Zetkama’s bellow seal control valves serve a wide range of industries:
- Chemical and Petrochemical: Safe handling of aggressive and hazardous fluids.
- Power Generation: Ideal for steam and thermal oil circuits.
- HVAC Installations: Precise control in heating and cooling networks.
- Industrial Water Systems: Regulation of water, glycol, and other neutral media.
- Shipbuilding: Robust performance in marine environments.
- Compressed Air Systems: Prevention of reverse flow and efficient air control.
Key features and operational advantages
These bellow valves come in stop and throttling variants to match different control needs. Standard manual operation is available with an optional electric actuator for system automation. The compact design allows for installation even in confined spaces, and all valves are engineered for easy maintenance thanks to accessible internal components and standardized parts. With Class A leak tightness and conformity to international standards, Zetkama’s zBEL series stands out for reliability and efficiency.
Why choose Zetkama’s bellow seal control valve solutions?
Zetkama brings over 75 years of engineering experience to the industrial valve market. Known for manufacturing precision components in its own modern foundry, Zetkama supplies valves to over 75 countries and provides rapid delivery under its 48H program. The zBEL series exemplifies Zetkama’s commitment to quality, safety, and technological advancement—offering peace of mind for engineers and operators seeking the highest standard in valve performance.