The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 29, 1993
Filed:
May. 08, 1992
Applicant:
Inventor:
Markus C Kihlberg, Blasdell, NY (US);
Assignee:
Moog Controls, Inc., E. Aurora, NY (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
F15B / ; F16K / ;
U.S. Cl.
CPC ...
13762569 ; 13762566 ; 251368 ;
Abstract
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.