Spring ring valve seat and butterfly valve with spring ring valve seat

摘要

A butterfly valve has a housing that has an annular valve seat and a butterfly disk that has an annular valve seat. At least one of the valve seats is a spring seat that has an annular mounting portion and an axially opposite annular engagement portion. The engagement portion is configured to contact the other valve seat and resiliently deform radially under hoop stress caused by the contact as the butterfly disk moves to the closed position. The engagement portion is connected to the main body of the respective one of housing or the butterfly disk by the mounting portion. The mounting portion is attached to the main body of the respective one of housing or the butterfly disk in a manner such that the mounting portion can articulate relative to the main body of the respective one of housing or the butterfly disk as the engagement portion resiliently deforms radially.