Patents Assigned to Parker-Hannifin Corporstion
  • Proportional valve spool with linear flow gain
    Patent number: 11680649
    Abstract: An example spool includes a shaft varying in diameter along a length of the shaft, and a plurality of annular lands formed on the shaft and spaced-apart by respective reduced diameter annular neck portions. The plurality of annular lands comprise at least one annular metering land, and wherein the at least one annular metering land comprises: one or more sine notches formed as a portion of a sine wave, and one or more additional notches having a different shape from the one or more sine notches.
    Type: Grant
    Filed: August 26, 2021
    Date of Patent: June 20, 2023
    Assignee: Parker-Hannifin Corporstion
    Inventors: Mitchell P. Eichler, Michael Broeckmann, Bipin G. Kashid