Hydraulic Bellows

Hydraulic corrugated pipe is a flexible sealing pipe that can be axially extended and bent, usually made of multiple layers of metal sheets (or high-performance polymers) through precision welding or forming processes, forming a corrugated shape. Its core function is to establish a completely sealed and leak free channel between fixed and moving components to accommodate complex relative movements.

Hydraulic bellows are powered by hydraulic cylinders and fluid control is achieved through bellows or sealing rings. For example, in valve design, corrugated pipes are used as sealing elements and driven by hydraulic cylinders to achieve switching actions. In mechanical transmission, hydraulic bellows can replace traditional mechanical transmission devices, reduce operational difficulty, and extend service life.

When selecting hydraulic corrugated pipes, the following parameters should be given special attention to ensure compatibility with the hydraulic system:
Working Pressure: It refers to the maximum hydraulic pressure that the bellows can withstand during long-term operation. It should be 1.2 to 1.5 times greater than the actual working pressure of the system (safety factor) to prevent overpressure rupture.

Operating Temperature: It is selected based on the medium temperature and ambient temperature. Metal bellows typically cover a temperature range of -200 ℃ to 600℃ (up to 1000℃ for high-temperature alloys), while plastic bellows mostly cover a temperature range of -40 ℃ to 80℃.

Displacement compensation amount: It includes axial compensation amount (the maximum length change of tension/compression), lateral compensation amount (the maximum distance of lateral offset), and angular compensation amount (the maximum deflection Angle), which must be greater than the actual displacement amount generated by the system.

Media Compatibility: Ensure that the material of the corrugated pipe does not undergo chemical reactions with the hydraulic medium (such as mineral oil, synthetic hydraulic oil, water-ethylene glycol solution), and avoid corrosion or material aging (for example, carbon steel cannot be used in water-based hydraulic fluid).

Nominal Diameter: It matches the inner diameter of the pipeline, usually ranging from DN6 to DN500 (customization is required for larger diameters), and it affects flow and pressure loss.

Fatigue Life: It refers to the number of reciprocating deformation cycles that a bellows can withstand under rated pressure and displacement (usually required to be ≥ 10,000 times, and for industrial equipment, ≥ 100,000 times). Insufficient life will lead to early rupture.
 

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