High-flow rate miniature digital valve system
DOI:
https://doi.org/10.1080/14399776.2017.1358025Keywords:
fast switching, on/ off valve, solenoid actuator, hydraulic valve, Digital hydraulicsAbstract
Digital hydraulic valve systems can offer several benefits compared to spool-type proportional valves, such as faster response, more flow capacity, better fault tolerance and individual metering. However, the digital valve systems currently available are large, heavy and slow and therefore there is a need to miniaturise them and simultaneously make them faster. This article describes the design and performance of a digital valve system which can be used to replace a proportional valve with ISO 03 (NFPA D03, CETOP 3, NG6) standard interface. The valve system consists of 32 pilot operated miniature on/off valves which form four independently controlled metering edges. The valve system has small dimensions (176 × 49 × 72 mm) even though it contains integrated control electronics, its response time is approximately 2 ms and flow capacity per metering edge is 30 l/min at Δp = 0.5 MPa. These properties are good, however, improvements are required to reduce the leakage caused by the pilot valves, which can reach 5 l/min per metering edge at 10 MPa pressure difference.
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References
Fischer, H., et al., 2015. Digital hydraulics on rails – pilot
project of improving reliability on railway rolling stock
by utilizing digital valve system. In: Proceedings of the
fourteenth scandinavian international conference on fluid
power, vol1. Tampere, Finland.
Garrity, J., Breidi, F., and Lumkes, J., 2016. Design of a high
performance energy coupling actuated valve (ECAV). In:
Proceedings of the 10th international fluid power conference.
Dresden, Germany, vol 3, 515–526.
International Organization for Standardization, 1988. ISO/
IEC 6403: Hydraulic fluid power – valves controlling flow
and pressure – test methods. Geneva, Switzerland.
Kudzma, S., et al., 2012. A high flow fast switching valve
for digital hydraulic systems. In: Proceedings of the fifth
workshop on digital fluid power. Tampere, 175–188.
Laamanen, A., Linjama, M., and Vilenius, M., 2007. On
the pressure peak minimization in digital hydraulics.
In: Proceedings of the 10th scandinavian international
conference on fluid power. Tampere, Finland, 107–121.
Lantela, T., et al., 2014. Pilot operated miniature valve with
fast response and high flow capacity. International journal
of fluid power, Mar, 15 (1), 11–18.
Lasaar, R. and Stoll, A., 2010. New innovative components for
energy efficient working hydraulics in mobile machines.
In: 7th international fluid power conference. Aachen,
Germany.
Linjama, M., et al., 2015. Mechatronic design of digital
hydraulic micro valve package. Procedia engineering, 106,
–107.
Linjama, M., Laamanen, A., and Vilenius, M., 2003. Is it
time for digital hydraulics? In: Proceedings of the 8th
scandinavian international conference on fluid power,
vol1. Tampere, Finland, 347–366. Available from: http://
www.tut.fi/cs/groups/public_news/@l102/@news/@p/
documents/liit/mdbw/mdq0/~edisp/p044763.pdf.
Paloniitty, M., Linjama, M., and Huhtala, K., 2015. Equal
coded digital hydraulic valve system – improving tracking
control with pulse frequency modulation. Procedia
engineering, 106, 83–91.
Parker Hannifin, 2016. Direct operated proportional DC
valve series D1FP 3. Available from: http://www.parker.com/
literature/Hydraulic Controls Europe/HY11-3500UK/PDF_
/D1FP UK.pdf.
Uusitalo, J.-P., 2010. A novel digital hydraulic valve package: a
fast and small multiphysics design. Thesis (PhD). Tampere
University of Technology. ISBN 978-952-15-2437-0.
Valmet, 2016. Digital hydraulics. Valmet technical paper series.
Available from: http://www.valmet.com/globalassets/
media/downloads/white-papers/process-improvementsand-
parts/wpp_digihydraulics.pdf.
Winkler, B., Plöckinger, A., and Scheidl, R., 2010. A novel
piloted fast switching multi poppet valve. International
journal of fluid power, 11 (3), 7–14.
