The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 23, 2021
Filed:
Dec. 13, 2018
Applicant:
Eaton Intelligent Power Limited, Dublin, IE;
Inventor:
Michael Rannow, Eden Prairie, MN (US);
Assignee:
EATON INTELLIGENT POWER LIMITED, Dublin, IE;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G05D 7/00 (2006.01); F15B 20/00 (2006.01); F15B 13/04 (2006.01); F16K 11/07 (2006.01); F15B 13/08 (2006.01); F16K 31/06 (2006.01); G01M 3/28 (2006.01); F15B 13/043 (2006.01); F15B 13/044 (2006.01);
U.S. Cl.
CPC ...
F15B 20/005 (2013.01); F15B 13/0402 (2013.01); F15B 13/086 (2013.01); F16K 11/07 (2013.01); F16K 31/0675 (2013.01); G01M 3/2876 (2013.01); F15B 13/043 (2013.01); F15B 13/0446 (2013.01); F15B 2013/0412 (2013.01); F15B 2211/3111 (2013.01); F15B 2211/327 (2013.01); F15B 2211/42 (2013.01); F15B 2211/6306 (2013.01); F15B 2211/6309 (2013.01); F15B 2211/6313 (2013.01); F15B 2211/857 (2013.01); F15B 2211/8636 (2013.01); Y10T 137/2544 (2015.04); Y10T 137/8671 (2015.04);
Abstract
Hydraulic systems and associated methods configured to reduce leakage past a spool valve when the system is in a neutral state. Leakage reduction is achieved by shifting the spool valve within the spool bore. The shifting direction can depend on whether the system has a relatively high load or a relatively low load in the neutral state. The amount of shifting can depend on the pressure differential between the supply line and the work port, and/or the pressure differential between the work port and the tank line.