US 11,053,958 B2
Regeneration valve for a hydraulic circuit
John Ferraz, Jr., Romeoville, IL (US); Michael Thomas Jackson, Hanna City, IL (US); and William Norbert O'Neill, Eureka, IL (US)
Assigned to Caterpillar Inc., Peoria, IL (US)
Filed by Caterpillar Inc., Deerfield, IL (US)
Filed on Mar. 19, 2019, as Appl. No. 16/357,459.
Prior Publication US 2020/0299932 A1, Sep. 24, 2020
Int. Cl. F15B 13/02 (2006.01); F15B 21/14 (2006.01); F15B 11/024 (2006.01); F15B 13/04 (2006.01); E02F 9/22 (2006.01)
CPC F15B 13/021 (2013.01) [E02F 9/2217 (2013.01); F15B 11/024 (2013.01); F15B 13/0403 (2013.01); F15B 21/14 (2013.01); F15B 2011/0243 (2013.01); F15B 2211/3058 (2013.01); F15B 2211/88 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A regeneration valve for a hydraulic circuit having a hydraulic fluid flowing therethrough, the regeneration valve comprising:
a housing defining a first port, a second port, and a third port;
a chamber formed in the housing and fluidly communicating with the first, second, and third ports;
a valve element disposed in the chamber and movable between a first position, in which the second port fluidly communicates with the first port, and a second position, in which the second port fluidly communicates with the third port;
a resilient member coupled to the valve element and configured to apply a biasing force on the valve element toward the first position;
a moveable flow restrictor element disposed between the valve element and the housing, the flow restrictor element configured to move between the first port and the second port of the housing for restricting flow of hydraulic fluid from the second port to the first port; and
an actuation chamber located at an end of the valve element in a direction opposite to the resilient member, the actuation chamber disposed in selective fluid communication with the second port via a pilot passageway defined in the housing, wherein:
upon restricting flow of fluid from the second port to the first port by the flow restrictor element and at a predetermined flow rate between the second port and the first port, if a supply pressure of hydraulic fluid at the actuation chamber exceeds the biasing force of the resilient member, the valve element moves to the second position for supplying fluid from the second port to the third port.