Rudolf Scheidl, Bernhard Steiner, Bernd Winkler, Gudrun Mikota,
"Basic Problems in Fast Hydraulic Switching Valve Technology"
, in L Yongxiang, W Qingfeng, L Wei: Proceedings of the Sixth International Conference on Fluid Power Transmission and Control, ICFP'2005, Hangzhou, China, Seite(n) 53-57, 4-2005, ISBN: 7-5062-7402-7
Basic Problems in Fast Hydraulic Switching Valve Technology
Sprache des Titels:
Proceedings of the Sixth International Conference on Fluid Power Transmission and Control, ICFP'2005, Hangzhou, China
Fast and high flow rate switching valves are an
upcoming research topic in hydraulics. Requirements for
such valves stem from novel fast actuation systems, from
emergency handling devices, or from switching control
hydraulic systems. New design concepts for such valves
are necessary to achieve high flow rates with light weight
spools and with short strokes. A basic feature of such
valve concepts is to provide multiple metering edges.
Inertia not only of the spool but also of the armature of
the solenoid for the valve’s actuation and of eventual
intermediate gears are relevant and have to be minimized
to reduce the effort of the actuator. Solenoids with a flat
armature seem to be the best fitting magnetic actuator
type for fast switching. Their force characteristics
provides high forces only for small armature strokes. This
has to be compensated by a properly tuned gear and
repelling spring. Spools with tiny land shapes may cause
spool sticking problems which can be prohibited by a
proper spool and sleeve design. Fast switching has to be
accompanied by measures to avoid harmful pressure
oscillations, cavitation, and too high flow rate peaks.
Such measures interact with the valve design.