Patent ID: 7325566
Filing Date: 2008-02-05
Classification: F16K,Y10T

Abstract:
1. In a fluid flow control device of the type having a body, a fluid flow path defined in the body including an inlet, an outlet, and a valve seat between the inlet and outlet, and a valve member selectably movable in and out of engagement with the valve seat, the improvement comprising a filtering seal disposable in the fluid flow path upstream of the valve seat, the filtering seal comprising: a base member which defines an inlet in fluid communication with the flow path's inlet, an outlet in fluid communication with the valve seat, and an axis between the base member's inlet and outlet; said base member including a radially-extending sealing flange, with the radial sealing surface being defined on the sealing flange; said base member defining at its inlet a radial end face and the sealing flange has an end face which is coplanar with the end face of the base member; a first boss protruding from the end face of the base member and a second boss protruding from the end face of the sealing flange; an axial retainer surface formed on the base member; a radial sealing surface formed on the base member and being engageable with the inlet of the control device body; and a screen mounted on the base member in engagement with the retainer surface, the radial sealing surface being radially spaced from the screen a sufficient distance such that compression of the radial sealing surface will not compress the screen.