Valve and manufacturing method thereof

摘要

A valve which is cobalt-free excellent in wear resistance and seizure resistance manufactured by forming valve seats (4,5) for a valve disc (2) and a valve body (3) with a nickel base alloy in which silicide particles or boride particles of small particle size are finely dispersed, and the valve seat (4,5) is bonded to the valve disc (2) or the valve body (3) by way of an insert material (20) comprising a nickel base alloy of a lower melting point by transient liquid phase diffusion bonding.