Safety device for cylinder valve automatic switching unit
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United States of America Patent
Stats
-
Sep 5, 1995
Grant Date -
N/A
app pub date -
Mar 21, 1994
filing date -
Apr 6, 1993
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
The invention relates to safety device for a cylinder valve automatic switching unit, wherein said valve is automatically closed when some abnormality such as down of an air pressure takes place. A first air-operated selector valve 8 is installed which causes air flowing out of a reservoir tank 10 to flow into a second supply line 3 when air pressure is reduced, whereby a cylinder valve automatic switching unit 1 in the opening situation is caused to make a closing motion for closing a cylinder valve in the opened situation. And, a second air-operated selector valve 9 is further installed which discharges air flowing out of a first supply line 2 to the atmosphere when the air pressure is reduced.
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