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:
Feb. 27, 2001
Filed:
Mar. 05, 1999
Applicant:
Inventors:
Stanley D. Stearns, Houston, TX (US);
Ales Plistil, Houston, TX (US);
Assignee:
Valco Instruments Company, Inc., Houston, TX (US);
Primary Examiner:
Int. Cl.
CPC ...
F16K 3/16 ;
U.S. Cl.
CPC ...
F16K 3/16 ;
Abstract
A variable load mechanism for use in a valve seals the flow of a switched fluid. The flow passes through the mechanism in a region which includes shear seal surfaces. The lives of the components of the valve are extended by limiting the range of excursion in response to valve seat forces. The valve element is provided with a first force from a stack of Bellville washers, for example. A second force acts on the valve element through the spring and is determined by fluid pressure.