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:
Apr. 16, 1985
Filed:
Jun. 20, 1983
Raymond G Spinnett, Santa Ana, CA (US);
KDI American Products, Inc., North Hollywood, CA (US);
Abstract
An anti-backflow valve for installation in a blower discharge line of a therapy tub aeration system has an air inlet, an air outlet, and an auxiliary outlet in its housing. A spring-loaded check valve member within the housing precludes fluid flow outwardly through the air inlet. Also within the housing is a combined pressure relief and float valve mechanism which opens the outlet passage in response to a pressure in the housing greater than a predetermined relief pressure or the presence of water in the housing above a predetermined level. An initial backflow of water in the discharge line closes the check valve member, the float and relief mechanism limiting the air pressure building caused by a continued backflow and permitting water to enter the housing through the air inlet when the housing is vented. After reaching the predetermined level in the housing, the entering water is discharged through the auxiliary outlet passage.