Bellows Seal Valves
The design and engineering of the Hy-Lok bellows valves are of the highest quality in the industry and will withstand the challenges of the most demanding applications. Bellows valves are multipurpose & easily accommodate full system pressures with stability and safety. Clean operation is a hallmark of the Hy-Lok bellow valve.
The best choice for reliable and long-lasting service is a valve that is tested and manufactured to the highest standards and meets industry standards for safety and environmental requirements. Designed to meet the extreme conditions of gas and liquid systems, our bellow valves provide outstanding quality. Contact our representatives to learn more!
High Purity Bellows Sealed Valve
Bellows sealed valves are assembled in a Class 10 cleanroom, and passivation is done in a nitrogen environment. Ultrasonic cleaning is performed after passivation to ensure purity. Valves are also 100% helium leak tested. Packaged in purified, anti-static polyethylene bags that are pressurized into the high purity nitrogen gas protects valves during shipping and storage. Hy-Lok USA, Inc. bellows valves offer a precision-formed metal welded bellows assembly that has undergone electropolishing processing for maximum cycle life.
BL Series Assembly
Bellow Valve Construction
- Hy-Lok bellows valves are easily paneled mountable and have handle options such as round, toggle, and pneumatic actuation.
- The ball-bearing application between the upper and lower stem provides smooth operation, and the bonnet seals to the body without a gasket.
- Precision-formed metal bellows and nonrotating stem tips feature excellent corrosion resistance and long cycle life. The valve body is constructed from a single vacuum melt 316L stainless steel and has variable end connections.
- Sizes include 1/4″, 3/8″, and 1/2″ with end connection options that include Hy-Lok tube fittings, male/female ZCR fittings, and tube butt welds.
- These bellow valves offer an operating temperature rating of -20°F to approximately 200°F and a maximum working pressure of up to 250 psig (17.3 bar).
Bellow Valve Applications
Hy-Lok has a bellows valve solution to meet the needs of any industry and application. Hy-Lok bellows valves are commonly utilized in a variety of applications and industries such as semiconductor, manufacturing, biotech & pharmaceutical.
Hy-Lok bellows seal valves are engineered for high-integrity shutoff in systems where leak prevention, purity, and safety are critical. These valves are commonly used in environments that require zero stem leakage and consistent performance under pressure.
Typical applications include semiconductor gas delivery systems, high purity chemical processing, pharmaceutical production lines, laboratory instrumentation, and specialty gas distribution. They are also well suited for corrosive media handling and vacuum service applications where contamination must be minimized.
Materials and Options
Hy-Lok bellows sealed valves are manufactured using high-grade materials to ensure durability, corrosion resistance, and long service life in demanding environments.
Standard construction includes vacuum-melted 316L stainless steel bodies and precision-formed metal bellows. Additional material options may be available depending on application requirements, including specialized alloys for enhanced chemical resistance.
Available configuration options include multiple end connections such as tube fittings, ZCR fittings, and butt weld connections. Handle styles include round, toggle, and pneumatic actuation, allowing for flexibility in system design and automation integration.
Performance Specifications
Hy-Lok bellows seal valves are designed to deliver consistent, high-performance operation across a range of industrial applications.
- Temperature range: -20°F to 200°F
- Maximum working pressure: up to 250 psig (17.3 bar)
- Available sizes: 1/4 inch, 3/8 inch, and 1/2 inch
- Leak integrity: 100% helium leak tested
- Cleanliness: Class 10 cleanroom assembly with electropolished bellows
These specifications ensure reliable sealing performance, extended cycle life, and suitability for high purity and critical service environments.
Frequently Asked Questions
What is a bellows seal valve used for?
A bellows seal valve is used to prevent leakage along the valve stem, making it ideal for high purity, hazardous gas, and corrosive fluid applications where containment is critical.
Why choose Hy-Lok bellows sealed valves?
Hy-Lok bellows sealed valves are designed with precision-welded metal bellows, helium leak testing, and cleanroom assembly, ensuring superior reliability, safety, and long-term performance in demanding systems.
What industries use bellows seal valves?
Bellows seal valves are widely used in semiconductor manufacturing, pharmaceuticals, biotechnology, chemical processing, and specialty gas systems where purity and leak prevention are essential.
What materials are used in bellows sealed valves?
Most bellows sealed valves, including Hy-Lok models, are constructed from 316L stainless steel with electropolished bellows to provide corrosion resistance and extended service life.
What makes bellows seal valves different from standard valves?
Unlike standard valves that rely on packing seals, bellows seal valves use a welded metal bellows to eliminate stem leakage, providing a higher level of safety and environmental protection.
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