At Hanovix, we utilize state-of-the-art, fully automated hydraulic forming machines that can press multiple bellows in a single cycle with high consistency and efficiency. Over years of operation, we have developed a comprehensive library of precision molds in various sizes, allowing us to respond quickly to diverse customer requirements. Whether it’s multi-ply bellows, special alloys, or non-standard geometries, our experienced team can deliver customized solutions with fast turnaround and reliable quality.From straightforward applications to highly complex engineering demands, Hanovix bellows are trusted across a wide range of industries. Our products are used in aerospace and automotive systems for pressure and temperature regulation, in heating and medical equipment, gas turbines, oil and gas exploration, industrial valve seals, and electrical components — providing durable performance backed by years of proven field experience and life-cycle testing.
Standard hydroformed bellows are a cost-effective solution ideal for high-volume production. These bellows feature a root diameter equal to the original tube diameter and can be manufactured using either seamless drawn tubing or seam-welded tubing. When using seamless tubes, tooling can be adjusted to shape the bellows ends during the forming process — including the option to retain a closed-end, eliminating the need for a separate end fitting.The process involves placing a precision tube into a hydraulic corrugation machine with movable dies. As hydraulic pressure is applied internally, the tube expands outward and is pressed into shape between the dies, forming a complete convolution in a single step. This method ensures consistent quality and is ideal for producing large quantities at minimal cost.Design Specifications:Single-ply and multi-ply options available (2, 3, or more layers)Outer diameter range: 0.250″ to 4.50″Wall thickness (seamless): 0.003″ and aboveWall thickness (seam-welded): 0.004″ and aboveSupports custom shapes and configurations
Multiple-ply bellows are engineered for high-performance applications where increased pressure resistance, fatigue life, and vibration damping are required — without compromising flexibility. By nesting two or more thin-walled tubes concentrically, the combined structure distributes mechanical stress more effectively than a single-ply bellows, enabling it to withstand higher internal or external pressures and operate reliably over extended cycles.The fabrication process involves laminating seamless or seam-welded tubing, followed by precision hydraulic or roll forming to create consistent convolutions across all layers. Each layer moves in harmony under pressure, reducing localized stress and improving resistance to cracking and material fatigue. This makes multi-ply bellows especially suitable for demanding environments such as aerospace, cryogenics, vacuum systems, and high-pressure instrumentation.At Hanovix, we offer 2-ply, 3-ply, and 4-ply bellows using a wide range of materials — including stainless steel, Inconel, Hastelloy, and other high-performance alloys — to meet specific application demands such as temperature extremes, aggressive media, or high-cycle fatigue requirements.
Mechanically roll-formed bellows are produced by gradually shaping shallow corrugations along a thin-walled metal tube. Through a series of controlled rolling passes, these initial corrugations are deepened and narrowed until the final geometry — including diameter and length — is achieved. This method is particularly suitable for manufacturing large-diameter bellows, as well as multi-ply bellows with greater overall wall thickness, where hydraulic forming may not be practical.Design Specifications:Available in single-ply or multiple-ply (2, 3, or more layers)Outer diameter range: 2.00″ to 12.00″Wall thickness for seamless tubing: 0.005″ and aboveWall thickness for seam-welded tubing: 0.006″ and aboveSupports fully customized designs based on application needs
Extra flexible bellows are designed with deeper convolutions to allow greater axial travel and reduced spring force. This enhanced flexibility is achieved by forming the bellows with a root diameter smaller than the original tube diameter — a structure often referred to as "beaded" bellows. These bellows are typically produced using seamless drawn tubing and are well-suited for applications requiring low stiffness and high responsiveness to motion or vibration.
At Hanovix, product quality and reliability are verified through a full suite of in-house inspection and testing processes. Each bellows undergoes rigorous procedures before shipment, including hardness testing, vacuum leak detection, strength testing, air tightness checks, visual inspection, and helium mass spectrometry leak tests to ensure zero-defect delivery.We also perform extensive performance validation under simulated real-world conditions. These include pressure fatigue life testing (with or without pressure load), multi-directional displacement testing (axial, radial, angular), salt spray corrosion resistance tests, ultra-low temperature testing, and burst pressure testing. For critical applications, we also offer full-spectrum vibration tests — including axial and radial dynamic vibration — to assess performance under severe mechanical stress.Our in-house testing capabilities not only ensure long-term product durability but also enable faster lead times and higher reliability for demanding industrial applications.
Transforms pressure energy into precise movements or forces. Pressure can be applied either internally within the bellows or externally within a cup-shaped structure, with the external method generally preferred. When protection against overload is necessary, a floating head equipped with a limit stop is commonly employed.
Functions as a sealing device for joints or mechanical components like levers and linkages that undergo movement. It prevents leakage, particularly in scenarios where mechanical motion needs to pass through an enclosure wall. The pivot point labeled as "P" indicates the optimal location for rotation.
A specialized pressure motor, consisting of a bellows unit where one internal side is evacuated to establish a stable reference pressure. Variations in pressure on the opposite side are measured against this fixed reference, generating a predictable mechanical movement or stroke. Typically, a control spring is integrated to manage stroke rates, along with a mechanical stop to limit movement and prevent damage due to excessive displacement from the atmospheric pressure difference.
Designed to accommodate expansions caused by thermal or pressure changes. When equipped with appropriate end fittings, it can function as a storage reservoir for liquids or gases. Typical applications include serving as an oil reservoir in electrical cable joints and as thermal expansion compensators in oil-filled transformers.
Function similarly to pressure motors but utilize a sealed, temperature-sensitive liquid or gas as the pressure source. The thermal stimulus can either act directly on the bellows element or be detected remotely through a sensing bulb connected via flexible tubing. These motors are extensively used to actuate valves, switches, and other devices in response to temperature fluctuations.
Involves two bellows units connected by a tube, enabling hydraulic transfer of motion or force. When the system is completely filled with fluid, any linear movement in one bellows is immediately and equally transferred to the other. To safeguard against overload, both bellows are typically equipped with mechanical stops.
Designed with a packless and leak-free structure to accommodate thermal expansion in pipelines that transport steam, water, and other fluids. They can also serve to absorb vibrations or create flexible connections within the piping system.
A packless valve design, which eliminates the need for traditional packing materials. This sealing method is commonly applied to control or contain steam movement or adjustments in various types of equipment.
