Low leak boom control check valve
AssigneeCase Corporation
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.