By Josh Cosford, Contributing Editor It seems like a question with an easy answer, but you’d be surprised how often people ask, “how do relief valves work?” We in the fluid power industry take our knowledge for granted, but each and every one of us was at some point ignorant of literally every hydraulic component […]
Valve technology for enhanced control
Innovative application-specific valve concepts are one of the most important requirements for boosting productivity in mobile hydraulic applications, according to the engineers at Bucher Hydraulics, Remscheid, Germany. The company’s new modular SC12 proportional directional valve system, for example, offers responsive control behavior and low operating costs with consistently high machine availability. At the same time, […]
Smart sensor enhances material handling systems closed-loop control
Mobile equipment manufacturers are always striving to get the most out of their machines without overburdening the system with costly and complex mechanics. Moreover, performance expectations are not only shaping machine needs but also safety requirements. Consequently, this has driven many engineers to design closed-loop systems featuring electronic sensors as feedback devices. For example, manufacturers […]
How do I choose a joystick controller for my mobile machine?
By Josh Cosford, Contributing Editor A joystick is a type of lever used to control multiple valves or functions with a single control. It can be tilted fore and aft, and also left and right, but is often also equipped with electric or electronic buttons, switches or proportional rollers. So how do you choose a […]
New position sensor for hydraulic cylinders offers almost no stroke loss
Mobile machine designers are often faced with the following dilemma: accommodating quite a large functionality in the smallest possible installation space. Some mobile machines and utility vehicles must comply as well with unambiguous regulations regarding the width or height of the vehicle. The difficulty of this task becomes particularly evident when additional functions are to […]
Progressive versus linear spools in Danfoss PVG mobile proportional valves
Contributed by Buck Schmitt, CFPS, Territory Manager – Eastern PA and Mid-Atlantic, Kraft Fluid Systems When designing hydraulic systems for mobile machinery, there are a variety of requirements that range from basic setup functions to extremely precise maneuvers. Let’s examine the more precise and critical functions. There are several ways to approach hydraulic system challenges. […]
What is a relief valve?
A relief valve is a device used to limit pressure in one or more locations in a hydraulic circuit. A relief valve uses a spool or poppet engaged to the closed position by a spring. A spool is a cylindrical piece of machined steel that slides within a machined body. A poppet is a flat […]
Simplified hydraulic pumps for the low speed, high torque market
Using mechanical energy produced by a machine’s engine, a hydraulic pump can move hydraulic fluid from the pump’s own reservoir to a connected hydraulic motor, converting the mechanical energy to hydraulic energy. The incoming fluid/energy triggers the hydraulic motor to begin rotation, which can be used to actuate a component outside the system, such as […]
We’ve come a long way, baby: the evolution of construction equipment hydraulics
Modern mobile machinery has changed quite a bit. Here is a look at how construction equipment hydraulics have changed over the last couple hundred years. By Josh Cosford, Contributing Editor On a road near my home, there exists a hand-laid stone fence, perhaps 4 ft high and a hundred times as long. Crafted from locally-sourced […]
Energy-efficient hydro accumulators for energy storage or conversion
Roth Hydraulics, Biedenkopf, Germany, offers energy-efficient hydro accumulator solutions for systems requiring storage or conversion of hydraulic energy. These fluid technology components are used in mobile hydraulics, energy and power plant systems, industrial hydraulics, machine tools and oil and gas systems. Roth Hydraulics, formerly known as Bolenz & Schäfer, is a company with a long […]
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