Inflatable bladder keeps hydraulics clean

Aug. 9, 2001
The volume of fluid in hydraulic reservoirs changes due to heat and system operations.

The volume of fluid in hydraulic reservoirs changes due to heat and system operations. As the hydraulic fluid level rises and falls, it can cause turbulence, condensation, air/oil emulsification, and contamination. All pose potential problems for hydraulic components in the circuit. As a solution, Pronal, a French company, invented a separator an inflatable bladder made from heavy-duty synthetic fiber, coated and vulcanized inside and out with an oil-resistant elastomer. The separator inserts in the reservoir and inflates as the dropping fluid level creates a vacuum, expanding to occupy any voids. When fluid returns to the reservoir, it displaces the air and deflates the separator. If the reservoir is cluttered with pipes and nozzles, the separator can be placed outside the reservoir using flexible or rigid piping. The device can also be configured to let the reservoir work underwater.

Sponsored Recommendations

Aug. 15, 2025
This latest creation isn’t just highly sensitive and dexterous, it's robust enough to survive impacts previous designs couldn't — all while integrating high-speed sensor networks...
Aug. 15, 2025
From plug-and-play to custom solutions, discover high-precision spur and planetary gearheads, as well as screw drives that perfectly match maxon electric motors with respect to...
Aug. 15, 2025
Take a peek inside the design journey of a dual-rotor drone suitable for confined-space inspection in industries such as sewer management, hydro power plants, oil & gas, and chemical...
Aug. 15, 2025
Explore extended capabilities for applications that demand a compact footprint and low weight, including a rigid speed-torque characteristic that optimizes control for precision...

Voice your opinion!

To join the conversation, and become an exclusive member of Machine Design, create an account today!