Patent ID: 8091862
Filing Date: 2012-01-10
Classification: F16K

Abstract:
1. A butterfly valve comprising: a valve body made of a first material; a butterfly shaft in said valve body for rotation about a first axis; a butterfly plate in said valve body and secured to said butterfly shaft so that rotation of said butterfly shaft causes said butterfly plate to rotate about a second axis through a travel path between a closed position and an open position; a sleeve insert made of a second material harder than said first material, said sleeve insert within said valve body at least in a region of said travel path between said valve body and said butterfly plate, said sleeve insert comprises a pair of openings through which said butterfly shaft extends, said sleeve insert at least partially held in place in said valve body by said butterfly shaft; and an insulation member between said valve body and said sleeve insert, said insulation member operable to mitigate corrosion between said valve body and said sleeve insert.