Bellows Valves

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!

Request A Quote


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 

 bellows valve assembly diagram with benefits of each component


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).

View Our Catalog


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 semiconductormanufacturingbiotech & pharmaceutical.


If you have any questions about any of our products or services, don’t hesitate to give us a call. For any inquiries, fill out the form and one of our Hy-Lok representative will contact you soon.


Sign Up To Join Our Newsletter

Sign Up