Proportional hydraulic valves are key components in mobile agricultural and construction machines, as they control motion for a wide variety of functions via cylinders and hydraulic motors. Electrohydraulic actuation is often used to control valve main-spool movement. For lower flows two solenoids can directly actuate the spool, but such arrangements result in high hysteresis and […]
Building a world-class hydraulic pump
Understanding what can go wrong ensures that hydraulic pumps get built right. Every OEM says it wants quality, but the reality is that machine builders can choose from countless hydraulic components that vary widely in performance and price—from cheap, “throw-away” parts to high-quality and, more-expensive, products that are built to last. How does an engineer […]
Error prevention at the source: Proportional valves with on-board electronics
On-board electronics (OBE) is the direct and best way to correct nonlinear behavior of a valve, according to officials at Argo-Hytos, Zug, Switzerland. Direct-acting proportional control valves with integrated digital OBE allows fine control of valve spool position and movement. Incorporating a sensor and electronics into the valve body enables a control loop within the […]
Directional valve offers best of both worlds
The new DPX-HS hydraulic directional valves from Walvoil, Reggio Emilia, Italy, are designed specifically for mini and midi excavator applications. Today, these types of machines typically rely on one of two possible hydraulic control techniques. One uses load-sensing valves in combination with a load-sensing pump to provide precise control with calibrated and independent speed for […]
Innovation at Intermat
The recent Intermat exposition in Paris was Europe’s largest construction-equipment show slated for 2018. One of the highlights, the Intermat Innovation Awards, showcased some distinguished products and equipment for the construction and materials industry. Among the entries, here are some notable fluid-power related designs. Construction vacuum lifter AL-Blazer 2000 from AL-Lift is a vacuum lifting attachment for fork-based […]
Cartridge directional valves feature internal monitoring
Based on tried and tested cartridge-type directional seat valves, Bucher Hydraulics has developed a comprehensive valve family with a reliable system for monitoring operating position. The modular design reportedly lets users create individualized systems using high-performance valves that meet extreme requirements in mobile and industrial hydraulics—whether the focus is on energy efficiency, power density, intelligence […]
Modularity for mobile hydraulics
The demands placed on a modern hydraulic system in mobile working machines are varied, but important considerations include reliability, energy efficiency, ease of maintenance and a compact design. Control blocks from Argo-Hytos, Zug, Switzerland, combine standard and application-specific components and provide the flexibility necessary for efficient systems. Different designs, sizes and control strategies can be […]
Researchers push the boundaries of mobile machine performance
One of the major themes at the IFK 2018 fluid power conference in Aachen, Germany, is machine efficiency. In a presentation by researchers from the Technical University Darmstadt, “Integrated Fluid Dynamic Vibration Absorber for Mobile Applications,” researchers discussed how the setup of a suspension always leads to a compromise between comfort and safety. To counteract […]
Bucher offers mini power pack
Engineers at Bucher Hydraulics have developed the UP40 mini power pack with the aim of bringing hydraulic control closer to the drive while providing a more-compact envelope. Compared to other products on the market, the UP40’s dimensions have been reduced to a minimum, said company officials. The external dimensions of 80 × 80 mm (3.15 […]
Hydraulic tiltrotators add to excavator versatility
A tiltrotator is a hydraulic attachment between the arm and bucket of an excavator or backhoe loader. As the name implies, it permits the operator to tilt the bucket side-to-side and rotate on its axis, much like a human wrist. The device provides an excavator with more versatility and lets the operator perform more tasks […]
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