Patent · US Expired

Spring-loaded tandem control valve

US6644346B1 · kind B1 · utility

4Cited by

7References

8Claims

0Family size

Assignee

Framatome ANP · DE

Inventors

Hermann-Josef Conrads · Herzogenaurach, DE
Erwin Laurer
Jurgen Model · Erlangen, DE

Key dates

Filing date	Oct 16, 2000
Grant date	Nov 11, 2003
Priority date	—
Expiry date	Oct 16, 2020

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10T137/777
WIPO fieldEngines, pumps, turbines
WIPO sectorMechanical engineering

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.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.