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:
Dec. 23, 1997
Filed:
Nov. 14, 1995
Applicant:
Inventor:
Larry A Norton, Elkhorn, WI (US);
Assignee:
United Dominion Industries, Inc., Charlotte, NC (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B08B / ; F16K / ;
U.S. Cl.
CPC ...
137238 ; 137312 ; 13761417 ; 13761418 ; 1341 / ; 251 635 ; 251 636 ;
Abstract
A double seat flow control valve includes three pneumatic pistons enclosed within two air chambers to operate upper and lower valve disks for venting operations in addition to valve opening and valve closing operations. An air boost is provided for the upper valve disk to maintain the upper valve disk in a closed position during venting of the lower valve disk.