Design of a Crank-Slider Spool Valve for Switch-Mode Circuits with Experimental Validation

Shaun E. Koktavy, Alexander C. Yudell, James D. Van De Ven

Research output: Contribution to journalArticlepeer-review

7 Scopus citations


A challenge in realizing switch-mode hydraulic circuits is the need for a high-speed valve with fast transition time and high switching frequency. The work presented includes the design and modeling of a suitable valve and experimental demonstration of the prototype in a hydraulic boost converter. The design consists of two spools driven by crank-sliders, designed for 120 Hz maximum switching frequency at a flow rate of 22.7 lpm. The fully open throttling loss is designed for <2% of the rated pressure of 34.5 MPa. The transition time is less than 5% (0.42 ms at 120 Hz) of the total cycle and the duty cycle is adjustable from 0 to 1. Leakage and viscous friction losses in the design are less than 2% of the rated hydraulic energy per cycle. The experimental results agreed well with the model resulting in a 3% variation in transition time. The use of the high-speed valve in a pressure boosts converter demonstrated boost ratio capabilities of 1.08-2.06.

Original languageEnglish (US)
Article number061008
JournalJournal of Dynamic Systems, Measurement and Control, Transactions of the ASME
Issue number6
StatePublished - Jun 1 2018

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Copyright © 2018 by ASME.


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