Patent ID: 11873846
Assignee: HAMILTON SUNDSTRAND CORPORATION
Field: Mechanical elements (Mechanical engineering)
Classification: CPC F  G | IPC F

Claim 10:
11. A method of operating a pressure regulating valve within a fluid flow system, the method comprising:
flowing a fluid at a first pressure through an inlet of a housing and through a first conduit of a sleeve, wherein a cap is coupled to a first end of the housing such that the cap extends partially within and partially outside of the housing and a plurality of shims are positioned within the cap and axially aligned with a central axis of the cap;
flowing the fluid through a first regulating window of a spool into an internal cavity of the spool;
translating, by the spool, towards a first end of the housing as the fluid pressure within the internal cavity of the spool increases, wherein translating, by the spool, towards a first end of the housing as the fluid pressure within the internal cavity of the spool increases causes the spool to press against a pin extending between a spring seat and the spool, wherein the spring seat is positioned at least partially within a sleeve and is configured to abut a second distal end of a spring on a first side of the spring seat and the pin on a second side of the spring seat, wherein the spring is positioned at least partially within the cap and axially aligned with the central axis of the cap such that the spring abuts one of the plurality of shims at a first distal end of the spring;
flowing the fluid through a second regulating window when the fluid pressure within the internal cavity of the spool reaches a pressure limit, wherein the pressure limit is determined by a number of shims that make up the plurality of shims; and
flowing the fluid at a second pressure through a spool outlet of the spool, through a second conduit of the sleeve, and through an outlet of the housing, wherein the first pressure is greater than the second pressure.