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:
Jan. 06, 1981
Filed:
Aug. 16, 1978
Samuel G Jackson, Lubbock, TX (US);
Other;
Abstract
A back pressure valve employing a spring loaded diaphragm normally closing a discharge port or orifice combined with a push rod extending externally of the valve for coupling with a control actuator with the inner end of the push rod being operatively associated with the diaphragm for using an external control system for varying or regulating the back pressure in a fluid flow line. In one embodiment of the invention, the push rod is engaged directly with the diaphragm assembly, whereas in a second embodiment of the invention, the push rod is engaged with the spring which in turn is engaged with the diaphragm assembly. In both embodiments of the invention, a weak spring is associated with the diaphragm to bias the diaphragm to a closed position to prevent passage of air to a pump intake in the event the system is shutdown with the control actuator and push rod in a position to leave the diaphragm open or to relieve pressure on the heavier main diaphragm spring.