| 摘要 |
A high speed high-performance valve member has a spool that is movable within a cylindrical cavity of a valve body or sleeve. The spool and sleeve are both formed of hardened stainless steel, but the bearing surfaces and lands of the spool are provided with a deposition layer of titanium nitride to give the bearing surface a hard smooth finish. The differential hardness between the spool and sleeve prevents galling. Damage due to cavitation is avoided, and the valve has a failure rate reduced by a factor of about twenty.
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