Assembly having a spring-loaded tandem control valve
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United States of America Patent
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Oct 12, 2004
Issued Date -
N/A
app pub date -
Aug 26, 2003
filing date -
Apr 14, 1998
priority date (Note) -
Expired
status (Latency Note)
Importance
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 control parts. The control parts are connected in series in the control line of the fitting and are each actuated by a control valve. The control parts open the fitting only when all the control parts are in a position which opens the fitting. The fitting closes as soon as even only one of the control parts is in a position which closes the fitting.
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