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US 6,644,346 B1Granted
Spring-loaded tandem control valve
AssigneeFramatome ANP GmbH
InventorsHermann-Josef Conrads, Erwin Laurer, Jürgen Model
Life of this patent
Estimating the term…
Abstract
The fitting, in particular a safety valve, operates according to the relief principle or according to the loading principle. The fitting is opened and closed by a plurality of pilot parts. The pilot parts are connected in series in the control line of the fitting and are each actuated by a pilot valve. The pilot parts open the fitting only when all the pilot parts are in a position which opens the fitting. The fitting closes as soon as even only one of the pilot parts is in a position which closes the fitting.
Claims8
An assembly, comprising:
- a fitting communicating with a control line and being opened by pressure relief via said control line;
- a pilot device having at least two spring-loaded pilot valves each actuating a dedicated pilot part, for opening said fitting by pressure relief via said control line;
- wherein said pilot parts are arranged at said control line and are configured to open said fitting only when all said pilot parts are in a position in which the load on said fitting is relieved, and said pilot parts closing said fitting as soon as a single one of said pilot parts is in a position imposing a load on said fitting.
Dependencies are inferred from the claim text.