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:
Nov. 06, 1984
Filed:
Sep. 13, 1982
Klaus-Dieter Bergemann, Hanover, DE;
Karl-Heinz Deike, Pattensen, DE;
Bernd-Joachim Kiel, Wunstorf, DE;
Heinz-Werner Konig, Barsinghausen, DE;
Wabco Fahrzeugbremsen GmbH, Hanover, DE;
Abstract
The invention relates to a pneumatic relay valve for regulating output pressure in proportion to a control pressure. The relay valve includes a first piston member which is acted on by the control pressure and a second piston member which is acted on by the input pressure. A compression spring is located between the two relay piston members. The strength of the compression spring determines the height of a predetermined minimum controlled pressure even if the input pressure is subsequently lost or drops to a low value. In addition, the output pressure of a receiver can be maintained at a specific adjustable level which may be below the maximum pressure value of the input pressure due to the compression spring located between the two relay piston members.