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:
Jul. 16, 1996
Filed:
Jun. 30, 1995
Wilbur D Hutchens, Marshalltown, IA (US);
Timothy A McMahon, Marshalltown, IA (US);
Brian V Nolan, Mason, OH (US);
Steven M Kirk, Cincinnati, OH (US);
Paul R Hunsberger, Jr, Mason, OH (US);
Fisher Controls International, Inc., Clayton, MO (US);
Abstract
A fluid seal for rotary valves wherein a metal seal ring is adapted to fit within a groove formed within the valve body and a retainer ring for sealing engagement with the sealing surface of a closure member. The metal seal ring has a non-symmetrical cross section with the retainer ring side portion including a shoulder engaging the retainer within the groove and a seating portion extending from the groove for sealing engagement with the closure member. A valve body side portion of the metal seal ring includes a shoulder engaging the valve body within the groove and a non-seating portion extending from the groove for a substantially non-sealing and non-engagement with the sealing surface of the closure member. Engagement of the closure member with the seating portion of the retainer side portion of the metal seal ring torsionally loads the cross-section of the seal ring so as to only enlarge the retainer side portion. A resilient material seal ring can be added to the metal seal ring for desired applications. If the resilient material ring is destroyed by high temperatures or fire, the seating portion of the metal seal ring continues to reliably engage the closure member. An elastomeric O-ring can be used on the metal seal ring on a side opposite to the resilient material ring.