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:
Oct. 08, 1991
Filed:
Dec. 12, 1989
Marcos P Ribeiro, Rio de Janeiro, BR;
Petroleo Brasileiro S. A., Rio de Janeiro, BR;
Abstract
A selective valve to pass fluids consists of a body, and a housing, and is provided above and in the middle with a communicating passage for low surface tension and viscosity fluid, there being shells inside the body, seated upon the aforesaid housing, said shells consisting of a surface of a shape and a size that is controlled, a soft surface, and orifices, a sealing surface created in the control area of the shells where it meets the housing. There are below and in the middle, a communicating passage in touch with the fluid compressed by the pump. Preferred versions of the selective valve are provided with controlling blades and a ball and roughness controlling surfaces instead of the shells.