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US 9,273,702 B2Granted
Dynamically adjusting counterbalance valve
AssigneeSun Hydraulics, LLC
InventorFrederick G. Grawunde
Life of this patent
Estimating the term…
Abstract
A counterbalance valve is provided with load-sensing, hydro-mechanically setting, features. The counterbalance valve relief setting changes dynamically based on the load pressure at the load port of the counterbalance valve.
Claims7
A counterbalance valve, comprising:
- a valve body having:
- a first end, a second end, and a longitudinal chamber therebetween;
- a load port, a valve port, and a pilot port all of which are configured to communicate with the longitudinal chamber;
- wherein the pilot port is disposed in the valve body;
- a piston positioned within the longitudinal chamber, the piston being longitudinally slidable along the longitudinal axis between an open position and a closed position, wherein in the open position a fluid passageway is established between the load port and the valve port, and in the closed position the load port is sealingly isolated from the valve port;
- a sleeve disposed within the longitudinal chamber, the sleeve being slidable between a minimum position and a maximum position;
- a spring disposed within the sleeve;
- a ball holder disposed within the sleeve, the ball holder compressing the spring within the sleeve;
- a ball disposed between the ball holder and the piston;
- the sleeve, the spring, the ball holder and the ball collectively biasing the piston into the closed position;
- a grounding spring disposed between an exterior of the sleeve and an interior of the valve body configured to bias the sleeve into the minimum position.
8 more elements
Dependencies are inferred from the claim text.