Patent ID: 11865051
Assignee: STRYKER CORPORATION
Field: Mechanical elements (Mechanical engineering)
Classification: CPC A  F | IPC A  F

Claim 7:
8. A pilot operated control valve assembly comprising:
a first chamber with a first inlet for fluid communication with a first conduit, a second inlet, an outlet for fluid communication with a second conduit, and a pilot piston assembly mounted for movement in said first chamber;
a second chamber having an inlet for communication with a third conduit, an outlet, and a valve poppet movably mounted in said second chamber between a closed position wherein said inlet of said second chamber is not in fluid communication with said outlet of said second chamber and one or more open positions wherein said inlet of said second chamber is in fluid communication with said outlet of said second chamber to allow fluid flow from the third conduit through the outlet of the second chamber;
said pilot piston assembly includes a pilot piston with a piston side facing said first inlet of said first chamber and a pilot rod, said pilot rod extending from said first chamber into said second chamber to selectively move said valve poppet, said second chamber being sealed from said first chamber;
said second inlet of said first chamber is in fluid communication with said outlet of said first chamber so that fluid flows from said outlet of said first chamber from said first inlet or said second inlet to allow fluid flow between the first conduit and the second conduit during operational fluid flow conditions; and
wherein when the fluid flow to said first inlet of said first chamber exceeds a preselected flow rate, back pressure at said first inlet of said first chamber moves said pilot piston and cause said pilot rod to move said valve poppet from said closed position to one of said open positions to allow fluid flow from said inlet of said second chamber to said outlet of said second chamber to allow fluid flow from the third conduit through the outlet of the second chamber.