Apparatus for visually checking the operational status of a stop valve, and a manual opening apparatus for a normally-closed valve
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Oct 19, 2004
Grant Date -
Oct 4, 2001
app pub date -
Mar 23, 2001
filing date -
Mar 27, 2000
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An apparatus for manually opening a normally-closed valve includes a value and a hand-operated valve opening jig. The valve includes a working rod for operating a valve element which is moved to close and open a conduit; a cylindrical holder fixed to the working rod, and to which the hand-operated valve opening jig can be detachably attached from the outside of the housing; a biasing member which biases the working rod to close the conduit; and a pressure chamber which is supplied with a working fluid to move the working rod to make the valve element open the conduit. The hand-operated valve opening jig includes a manual-opening attachment which can be detachably attached to the cylindrical holder; and an operational member which is operated to move the working rod in a direction to make the valve element open the conduit via said manual-opening attachment.
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