Patent ID: 6701955
Filing Date: 2004-03-09
Classification: F04B,F16K,Y10S,Y10T

Abstract:
A valve apparatus having a longitudinal axis therethrough, comprising:a valve seat member that comprises a hollow bore and a first frustoconical contact surface; a valve closure member that comprises a body and a second frustoconical contact surface that is adapted to seal against the first frustoconical contact surface, the valve closure member being movable along the longitudinal axis of the valve apparatus; a fluid flow path through the bore of the valve seat member and between the valve seat member and the valve closure member, the fluid flow path being closed when the second frustoconical contact surface is in contact with the first frustoconical contact surface; and a resilient screening insert, attached to at least one of the valve closure member or the valve seat member at the outer perimeter thereof and having a portion between the first and second frustoconical surfaces, further having a first flat insert contact surface, nearer the longitudinal axis of the valve apparatus, adjoining a second flat insert contact surface that is sloped such that a valve exit gap varies with the distance from the valve closure member outer perimeter and that is at a minimum at the juncture of the first flat insert contact surface and the second flat insert contact surface, and that forms a screening gap between the second flat insert contact surface and the opposing frustoconical contact surface that screens particles from fluid passing through the fluid flow path in a reverse direction when the valve closure member approaches the valve seat member.