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. 29, 1980
Filed:
May. 09, 1979
Robert Bosch GmbH, Stuttgart, DE;
Abstract
The device for testing the nozzles of injection pumps includes a temperature-responsive element arranged in the return-flow conduit of the injection pump and connected to the input of a control device the output of which controls two solenoid-operated 4/2 directional control valves which alternately open or close the feeding port to the intake conduit of the pump under test. The test liquid which is alternately delivered into the intake conduit by means of two delivery pumps from two containers storing the test liquid at different temperatures. When the temperature of the test liquid discharged by the overflow valve in the injection pump exceeds an upper limit (for example 55.degree. C.), the control valve through which the warmer test liquid is supplied is closed and the other valve delivers the cooler test liquid into the injection pump. Similarly, when the temperature of the overflow drops below the limit value, the delivery of the test liquid is switched over to take place from the warmer container. In this manner it is possible to keep the temperature of the test fluid in the injection pump constant and the reproducibility of the injection test is considerably improved.