Hydraulics Tech Event with Sun Hydraulics and Bosch Rexroth

The other week, Hydnet hosted a customer event focused on technology together with our partners Sun Hydraulics and Bosch Rexroth.

Florian Muller from Sun Hydraulics did a deep dive into Sun Hydraulics load-holding valves, and here are some key takeaways:

• A pilot-operated check valve holds a load, but is not suitable when the load passes over center and creates a positive driving force. This is also where one of the valve’s nicknames, “overcenter valves,” comes from.
• A load-holding valve should be set to 1.3 times the maximum load.
• Be very cautious if the load-holding valve is preceded by a directional valve with a closed center. This can trap pilot pressure and prevent the valve from ever closing.
• Use vented valves, either 3-port to atmosphere or 4-port with an additional drain line, to solve issues with back pressure.
• As a rule, do not choose a load-holding valve that is too large—rather size it slightly smaller to avoid chattering during load lowering.
• If you have varying flow, Sun Hydraulics offers “Motion” valves with longer spool stroke, allowing varying flows in the same valve while maintaining smooth operation.
• If there are large variations in load, a LoadMatch valve can be selected, which adjusts the pilot opening pressure to 3 times the current load.
• There are many different pilot ratios; generally, a lower pilot ratio (e.g., 3:1) is more stable but consumes more energy, while a higher pilot ratio (e.g., 10:1) is more energy-efficient but less stable.

Kris Vandelli from Sun Hydraulics spoke about several exciting valves, including Energen, which is installed on the return line to generate electricity. Perfect for applications where you want to avoid running cables!

Our colleague Oscar Berglund did a deep dive into the wide range of unique, problem-solving valves that Sun Hydraulics offers.

Fredrik Lamberg explained how we combine our expertise in valves, pumps, and motors with valve integration from Sun Hydraulics directly on Bosch Rexroth’s pumps and motors.

Erik Chu from Bosch Rexroth spoke about:

• The Machinery Directive
• eOC, a pump controlled electrically with sensor feedback, where hydromechanical control functions and interfaces are moved into software
• RM – Bosch Rexroth’s mobile valve

Thank you to Rottne, Ljungbymaskin, Stackehydraulik, Spmaskin, and Camblift for your engagement, a great day, and valuable discussions! Thanks to Sun Hydraulics and Bosch Rexroth for interesting and insightful presentations!

If you would like to participate in a customer event or have us visit you for a deep dive into the technology, feel free to contact us!