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:
Sep. 13, 1988
Filed:
Feb. 26, 1986
Kraftwerk Union Aktiengesellschaft, Muheim, DE;
Abstract
A valve for shutting off a flow having a housing wherein a plug member is movable between 'on' and 'off' terminal positions by means of a thread; a rotary drive which is switchable off with time delay in the 'off' terminal position of the valve; a resilient member for limiting an increase in torque generated by kinetic energy of the rotary drive in the 'off' terminal position; and a torque control for the rotary drive includes means defining a range of rotation of the rotary drive in both directions of travel thereof, the entire range of rotation corresponding to a stroke of the plug member and being subdivided into a starting range beginning at one terminal position and ending before a new terminal position is reached as well as into the remaining range; the rotary drive having an available starting torque (break-away torque), taking into consideration the tolerance limit of the power supply in the starting range downwardly, which is at least 10% higher than the largest torque applicable by the rotary drive, taking into consideration the tolerance limit of the power supply in the remaining range upwardly.