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US 5,346,179 AGranted
Galling resistant flex-seat for gate valves
AssigneeFMC Corporation
InventorBernhard Lochmann
Life of this patent
Estimating the term…
Abstract
A valve seat member in a gate valve has a circular or crescent shaped slot cut on the inside diameter parallel to and underneath the seat surface to create a seat with increased flexibility at areas on the seat surface where high compressive stress during valve operation is observed. As a result galling of the gate is reduced, and valve reliability and life are increased.
Claims4
A galling resistant valve seat for a gate valve having a valve gate for motion between valve closed and valve open positions, comprising
- a valve seat member having a valve seat surface and an inside diameter for surrounding a flow path,
- said inside diameter having at least one slot cut along a limited portion thereof, said slot being positioned adjacent to and spaced from said valve seat surface, whereby valve seat surface flexibility is increased in the valve seat surface area adjacent to said slot and valve gate galling is thereby minimized.
A gall resistant gate valve having a flow path therethrough, comprising
- a valve seat member having an annular valve seat surface and an inside diameter forming a part of the valve flow path,
- a valve gate for movement relative to said valve seat surface so that valve gate movement alternately provides an open and a closed flow path condition,
- said valve seat member inside diameter having at least one cavity formed therein, said at least one cavity extending along a portion only of said valve seat member inside diameter, said cavity further being positioned adjacent to and spaced from said annular valve seat surface, whereby compressive stress between said valve seat surface and said valve gate is reduced in the region of said cavity.
Dependencies are inferred from the claim text.