| 摘要 |
According to one embodiment, there is provided a valve apparatus including a cladding portion that is integrally formed on a sliding-contact surface of either a valve rod (205) or a valve body (204), which serves as a movable member, wherein the cladding portion is formed by inducing a pulsed discharge between an electrode, which is formed of a molded body consisting mainly of a metal, and a treatment target portion of either the valve rod (205) or the valve body (204), so as to weld and deposit a material of the electrode on a surface of the treatment target portion; and a surface layer that is integrally formed on a sliding-contact surface of either a bushing (201) or a sleeve, which serves as a stationary member, wherein the surface layer is formed by forming a first coating film by surface-hardening heat treatment using a metallic cementation. |
