High-pressure electrorheological valve with full pQ-functionality for servohydraulic applications

Abstract

Stationary and mobile hydraulic systems require switching increasing velocity, power and efficiency. Usually, their performance mainly faces physical constraints by the valves. These are in particular electrical and magnetic losses as well as various flow saturation effects. Compared to conventional valves, some of these physical constraints do not appear in electrorheological valves. However, electrorheological valves being employed as valves in conventional hydraulic systems were previously unimaginable due to the small controllable pressure differences. The presented new kind of electrorheological valve obtains a significant performance enhancement by combining the potential of conventional and electrorheological systems.

Research and Development of Electro-hydraulic Control Valves Oriented to Industry 4.0: A Review

“…The combined p/Q valves are attractive to industry, like injection molding machines, and there are also some studies for P/Q valves. Helmut Schmidt University developed an electrorheological valve with full p/Q-functionality for servohydraulic applications [24]. The Zhejiang University of Technology also studied a p/Q valve with digital controllers [25].…”

High-response electrorheological servo valve

“…It describes the pressure drop across a control valve as a function of the volume flow rate and the applied electric field strength. For modeling the field-dependent static rheological behavior of the suspension, the modified Carreau–Yasuda equation by Ulrich et al (2009) has proved (Heinken et al, 2015; Krivenkov et al, 2013)…”

Electrorheological Self-Amplifiying Microvalve

“…To obtain a significant increasing power density of the electrorheological single-microvalve the new kind of microvalve takes advantage of a primary and secondary reaction of the corresponding electrorheological effect [6]. The primary reaction due to the active change in the ER fluid viscosity generates the secondary reaction implying a modification in the flow channel geometry.…”