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. 14, 1981
Filed:
Apr. 07, 1980
Richard H Dugge, St. Louis, MO (US);
Arnold Schlobohm, Ballwin, MO (US);
ACF Industries, Inc., New York, NY (US);
Abstract
An automatic vacuum relief valve assembly includes a cover plate closing an opening in a container to the atmosphere. A valve is vertically spaced below the cover plate and closes communication between the inside of the container and the outside atmosphere. A first passageway provides fluid communication between a first surface of the valve and the outside atmosphere. A second passageway provides fluid communication between the inside of the container and a second surface of the valve. When the pressure inside the container becomes less than atmospheric pressure, atmospheric pressure will cause the valve to move away from its seat and allow air to enter the container. When the pressure is equalized, the valve is biased to return to the seated position. The cross sectional area of the first passageways and the cross sectional area of the second passageways are at least equal to the cross sectional area of the valve to maximize the volume of air flow for a given cross sectional area of valve and pressure drop between the outside atmosphere and the inside of the container.