The CINDY family of cartridge valves from Bucher Hydraulics, Klettgau, Germany, has been proven for decades in countless industrial and mobile applications. That, according to company officials, is due to features such as extremely low leakage, finger-tip controllability and load-independent cylinder travel behavior. Bucher Hydraulics has now expanded its well-established CINDY technology offerings with the […]
Metal-bellows accumulator handles the extremes
Edge-welded metal bellows accumulators are at the cutting edge of hydro-pneumatic accumulator technology, according to Peter Kloft and Daniel Rau, research and development engineers with HYDAC Technology in Sulzbach/Saar, Germany. Compared with other designs such as diaphragm, bladder and piston accumulators, the gas chamber in metal-bellows units is usually hermetically sealed and the metallic barrier […]
Shift in Motion: An innovative propulsion system for mobile machines
Manufacturers and operators of today’s mobile equipment often want a machine that does double duty: provides high tractive effort in the working mode and high maximum velocities when operating in the transport mode. These drivetrain requirements can be met through a wide array of traditional technological concepts, ranging from simple manual transmissions (shifted at standstill) […]
New-generation valve actuation
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 […]
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