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. 14, 1986
Filed:
Nov. 13, 1984
Friedrich R Stahlkopf, Buchen, DE;
Abel Pumpen GmbH, Buchen, DE;
Abstract
A device for regulating in a practically loss-free manner the pressure and feed volume of a diaphragm pump which is constructed as a hydraulically activatable diplacement pump and is especially suited for feeding a viscous and abrasive or a solids-laden secondary fluid medium. In the device, access is required only to the environment of the primary working fluid medium, and no direct interchanges between the secondary medium being fed and parts of the control device are required. During the pressure phase of the diaphragm pump, a limited quantity of the primary working medium is extracted from a portion of the housing of the device which is in direct and uninterrupted communication with the associated working section, while during the suction phase and in dependence on the overpressure of the primary working fluid medium in the device a compensation is made for the quantity of the primary working fluid medium lost during the pressure phase. The arrangement is such that at a pressure below an adjustable threshold pressure, a complete compensation is effected, while at a pressure above such a threshold pressure an incomplete compensation is effected which becomes more so as the difference between the overpressure and the threshold pressure increases, and that during the suction phase, proportional to the increasing compensation deficit, the primary working fluid medium within the associated working section of the pump is charged with gas from the surrounding atmosphere of the diaphragm pump.