VALVE APPARATUS AND METHOD OF MANUFACTURING THE SAME
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United States of America Patent
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Issued Date -
Dec 11, 2014
app pub date -
Jun 5, 2014
filing date -
Jun 7, 2013
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
According to one embodiment, a cladding portion is integrally formed on a sliding-contact surface of a valve rod or a valve body, 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 the valve rod or the valve body, so as to weld and deposit a material of the electrode on a surface of the treatment target portion. A surface layer is integrally formed on a sliding-contact surface of a bushing 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.
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