US 12,398,682 B1 · Direct control variable displacement pump with dual-function high-pressure relief valve- pressure regulating valve

Abstract

A dual-function high-pressure relief valve pressure regulating valve includes valve sleeve, a spool that slides laterally in a first direction and a second direction, and a piston disposed against the valve sleeve. The valve sleeve includes a PRV inlet window, a PRV outlet window, and a pressure relief outlet window. The spool includes a PRV inlet landing, and a combined PRV/HPRV landing. The piston is configured to slide laterally in the first direction and the second direction based on a pressing force applied by the spool. The dual-function HPRV-PRV operates in a first mode to adjust the spool and maintain opening of the PRV inlet window and the PRV outlet window while closing the pressure relief outlet window, and operates in a second mode to adjust both the spool and the piston to open each of the PRV inlet window, the PRV outlet window, and the pressure relief outlet window.

Claims20

Dependent claims

A pump control system comprising:

a direct control variable displacement pump (VDP) including a fluid inlet configured to receive an upstream fluid having a first pressure (P1) and a fluid outlet configured to output a downstream fluid having a second pressure (P2);
a dual-function high-pressure relief valve (HPRV)-pressure regulating valve (PRV) connected in parallel with the direct control VDP, the dual-function HPRV-PRV disposed in fluid communication between fluid inlet and the downstream fluid,
wherein the HPRV-PRV is adjustable in a first direction and an opposing second direction when operating in a first mode to maintain an open bypass flow path while closing a front entry relief flow path, and is adjustable in the first direction to maintain the open bypass flow path and to open the front entry relief flow path in response to operating in a second mode.

A dual-function high-pressure relief valve (HPRV)-pressure regulating valve (PRV) comprising:

a valve sleeve including a PRV inlet window, a PRV outlet window, and a pressure relief outlet window;
a PRV spool configured to slide laterally in a first direction and an opposing second direction with respect to the valve sleeve, the PRV spool including a PRV inlet landing, a combined PRV outlet landing and HPRV (PRV/HPRV) landing, and a chamber between the PRV inlet landing and the PRV/HPRV landing;
and
an HPRV piston disposed against the valve sleeve and configured to slide laterally in the first direction and the opposing second direction based at least in part on a pressing force applied by the PRV spool,
wherein the dual-function HPRV-PRV operates in a first mode to adjust the PRV spool to maintain opening of the PRV inlet window and the PRV outlet window while closing the pressure relief outlet window, and operates in the second mode to adjust both the PRV spool and the HPRV piston to open each of the PRV inlet window, the PRV outlet window, and the pressure relief outlet window.

2 more elements

Dependencies are inferred from the claim text.

Direct control variable displacement pump with dual-function high-pressure relief valve- pressure regulating valve

Life of this patent

Direct control variable displacement pump with dual-function high-pressure relief valve- pressure regulating valve

Life of this patent

Abstract

Claims20