Low leak boom control check valve including an insert
AssigneeCNH America LLC
InventorsGeorge T. Fiala, David W. Swaim
Life of this patent
Estimating the term…
Abstract
An insert or cartridge that fits into a cavity in a valve body provides a check valve function and an anti-cavitation function and a pressure relief function. This insert is substantially circular and has an internal cavity with a valve assembly that has two pairs of valve seats, one pair of valve seats providing the anti-cavitation function and the other pair of valve seats providing the pressure relief function. The outside of the insert itself engages with a sealing surface in the cavity in the valve body to provide the check valve function.
Claims16
A unitary insert for a cavity in a valve body, the insert comprising:
- a check valve,
- an anti-cavitation valve, and
- a pressure relief valve.
In a valve for directing the flow of fluid both to and from a hydraulic actuator, the valve having a valve body having a first cavity configured to receive a valve insert, the first cavity having a cylindrical inner surface and a bottom and a spool disposed in the valve body and configured to direct the flow of hydraulic fluid both from a source of hydraulic supply to an outlet port, and from the outlet port to a hydraulic tank, the improvement comprising:
- an insert disposed in the first cavity, the insert including an anti-cavitation valve, a check valve and a pressure relief valve
Dependencies are inferred from the claim text.