The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 21, 2025
Filed:
Feb. 22, 2024
Hamilton Sundstrand Corporation, Charlotte, NC (US);
Przemysław Kiełczykowski, Kiełczów, PL;
Damian Adam Słodczyk, Wrocław, PL;
Janusz Michał Sarosiek, Wrocław, PL;
Piotr Michał Bereszyński, Głogów, PL;
Tomasz Marek Skórka-Siemieński, Wrocław, PL;
HAMILTON SUNDSTRAND CORPORATION, Charlotte, NC (US);
Abstract
A check valve assembly includes a housing having a fluid inlet arranged to be fluidly connected, in use, to a source of hydraulic fluid, a first stage body having a first stage fluid outlet and a second stage body having a second stage fluid outlet and a flow passage between the first and second stage bodies. The first stage body is a hollow body having a first end in fluid communication with the fluid inlet and housing a hollow first stage retainer around which is mounted a first stage spring that biases a first stage ball. The second stage body is a hollow body housing a second stage retainer around which is mounted a second stage spring that biases a second stage ball, and wherein a first stage pressure differential between the first stage fluid outlet and the fluid inlet creates a fluid flow path from the inlet outlet.