Patent ID: 6932315

Claim:
An apparatus for manually opening a normally-closed valve, said apparatus comprising said normally-closed valve and a hand-operated valve opening jig, wherein said normally-closed valve comprises: a working rod for operating a valve element which is moved to close and open a conduit; a cylindrical holder which is coaxially fixed to said working rod, and to which said hand-operated valve opening jig can be detachably attached from the outside of said housing; a biasing member which biases said working rod in a first direction to make said valve element close said conduit; and a pressure chamber which is formed within said housing, and is supplied with a working fluid to move said working rod in a second direction to make said valve element open said conduit; wherein said hand-operated valve opening jig comprises: a manual-opening attachment which can be detachably attached to said cylindrical holder; a rotational member having a cylindrical surface which comes into contact with an operational mount mounted on said housing, said rotational member being pivoted about said manual-opening attachment via a pivot provided at a position which deviates from an approximate center of said cylindrical surface toward said cylindrical holder; and an operational member which operated to couple said manual-opening attachment to said cylindrical holder, and is operated to rotate said rotational member with said cylindrical surface contacting said operational mount.