Check valve seal assembly
AssigneeCaterpillar Inc.
InventorBryan E. Nelson
Life of this patent
Estimating the term…
Abstract
A check valve assembly includes a plug having a first end and a second end spaced along a longitudinal axis of the check valve assembly. The check valve assembly also includes a first valve seat, wherein the first end of the plug sealingly contacts the first valve seat. A second valve seat is spaced from the first valve seat in a direction of the longitudinal axis. The check valve assembly further includes a resilient member between the plug and the second valve seat and a spring member urging the resilient member into sealing contact with the second valve seat and the plug.
Claims20
A check valve assembly, comprising:
- a plug having a first end and a second end spaced along a longitudinal axis of the check valve assembly;
- a first valve seat, the first end of the plug sealingly contacting the first valve seat;
- a second valve seat spaced from the first valve seat in a direction of the longitudinal axis;
- a resilient member between the plug and the second valve seat;
- and
- a spring member urging the resilient member into sealing contact with the second valve seat and the plug.
A pump for supplying high-pressure fluid to a hydraulically-actuated fuel injection system for an engine, comprising:
- a drive shaft configured to receive drive torque from the engine;
- a drive plate coupled to the drive shaft;
- at least one sleeve coupled to the drive plate and having an internal bore, the at least one sleeve being reciprocatingly driven by the drive plate to pressurize fluid;
- an outlet passage in fluid communication with the internal bore;
- and
- a check valve assembly configured to allow pressurized fluid above a predetermined pressure to pass through the outlet passage to a collection outlet, the check valve assembly including two sealed contact regions spaced along an axis of the check valve assembly that prevent leakage through the check valve assembly and a biasing member urging a sealing member into a sealing engagement at one of the two sealed contact regions to prevent leakage from an interior of the pump to an exterior of the pump.
A method of assembling a check valve assembly, comprising:
- coupling a plug with a bore in an outlet passage of a pump housing;
- sealingly contacting a first end of the plug with a first valve seat defined by the bore;
- applying a spring force to a resilient member;
- and
- urging the resilient member into sealing contact with a second valve seat defined by the bore, the second valve seat being spaced from the first valve seat in a direction of a longitudinal axis of the check valve assembly.
Dependencies are inferred from the claim text.