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. 06, 1992
Filed:
Sep. 09, 1991
Hermann Dorr, Herzogenaurach, DE;
Siemens Aktiengesellschaft, Munich, DE;
Abstract
A reducing station has a safety function in a negative direction of action for metering energy flows in the form of gases, steam or water, in particular in thermal or industrial power plants. An operating leg of a servo valve is supplemented by at least one further safety leg of displacing a first spindle section carrying a restrictor body at one end, into a closed position. The displacement is effected as a function of an applied pressure-monitor tripping signal. A second spindle section is coupled to the other end of the first spindle section through preloadable springs and non-self-locking, securely brakeable safety-spindle thread stages. The second spindle section has a spindle drive which transmits an axial thrust or pull to the first spindle section through the securely braked safety-spindle thread stages, in a regulating mode. In a tripping mode, the second spindle section forms an abutment for the movement of the first spindle section with the restrictor body into a desired, closed position. The movement is released by the safety spindles. At least two safety legs each have one non-self-locking safety-spindle drive. Both safety legs can act on a rocker-like, two-armed safety lever. The safety legs can be tested as to their function.