Valve bonded with corrosion and wear proof alloy and apparatuses using said valve

A valve comprising a valve disc, a valve body and a valve seat installed on each of sliding portions of said valve disc and said valve body;

• said valve characterized in that a surface of each of said valve seats is made of a sheet material made of an alloy selected from the group consisting of a cobalt base alloy containing 0.6 to 3 wt.% of C, 2 wt % or less of Si, 25 to 32 wt % of Cr, 15 wt % or less of W, 3 wt % or less of Fe, 3 wt % or less of Ni, and 6 wt % or less of Mo, a nickel base alloy containing 1 wt % or less of C, 7 wt % or less of Si, 7 to 20 wt % of Cr, 5 wt % or less of W, and 3.5 wt % or less of B, and an iron base alloy containing 1.5 wt % or less of C, 4 wt % or less of Si, 15 to 27 wt % of Cr, and 8 wt % or less of Mo, and said alloy has a granular or lumpy eutectic carbide in a matrix having a metallic micro-structure wherein the particle size of said eutectic carbide does not exceed 30 microns.