SEDE DE VALVULA VALVULA A PROVA DE FOGO E PROCESSO PARA O DIMENSIONAMENTO DE UMA SEDE DE VALVULA BORBOLETA A UM DISCO DE UMA VALVULA BORBOLETA

摘要

A valve seat especially adapted for a butterfly valve is provided which is formed both of metal and <> material so as to furnisch a <> seal in normal operating conditions and a metal-to-metal seal in fire situations. The seat is uniquely constructed and is permanently deformed by the disc or closure member of the valve to form a precise size and configuration corresponding to the size and configuration of the disc.