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. 09, 1976
Filed:
Mar. 07, 1975
Karl-Heinz Kruger, Witten, DT;
Reinhard Altfelder, Dortmund-Mengede, DT;
Friedrich Uhde GmbH, Dortmund, DT;
Abstract
A system for holding a substantially constant pressure level in the medium pressure steam system of an integrated plant, despite any sudden shutdown of a high pressure steam turbine. A combination quick-opening and a control valve is provided with a hold-down operator and positioning actuator with a spring drive, the hold-down operator being connected through a changeover valve with a working pressure system. The positioning actuator is connected to an additional change-over valve and to the outlet of the pressure controller, such additional change-over valve being provided with a connecting line to the outlet of the pressure controller and to the outlet of a multiplier relay. The two change-over valves are actuated through the turbine trip system. The combination quick-opening and control valve has an operating lever mounted on a fixed fulcrum pivoted on the piston rod of another pneumatic drive. Alternatively, the operating lever for the combination quick-opening and control valve is pivoted centrally thereof to the valve stem and the two arms of the lever are connected respectively to the hold-down operator and the positioning actuator with their change-over valves.