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. 24, 1989
Filed:
Sep. 13, 1988
Carl H Hafele, 4052 Korschenbroich 1, DE;
Manfred Weyand, Korschenbroich, DE;
Sempell Aktiengesellschaft, both of, DE;
Other;
Abstract
In a servo-valve, a metal bellows (70) is fitted onto an end section (66) of valve stem (26,42) lying at a distance from the seal (22), one end of said metal bellows (70) being supported rigidly in housing (72), while its other end engages the end of the stem. The metal bellows (70) are located in a pressure chamber (62) which is connected by a condensate coil (74) to the valve intake (12), whereby the cross-sectional area of the metal bellows (70) is made to match the area of the passageway of the valve seat (16). In this way, it is possible to achieve an overall compensation of the forces at the seal (22) or a desired additional load in the closed or open direction.