초록 ▼

An apparatus for exercising an emergency shutoff valve of a steam turbine and methods for installing and operating the same. A frame of the apparatus mounts on top of an emergency shutoff valve body and spans the axis of a valve stem of the emergency shutoff valve. A plunger is suspended from the fr

An apparatus for exercising an emergency shutoff valve of a steam turbine and methods for installing and operating the same. A frame of the apparatus mounts on top of an emergency shutoff valve body and spans the axis of a valve stem of the emergency shutoff valve. A plunger is suspended from the frame and connects to the top of the valve stem of the emergency shutoff valve. The emergency shutoff valve, which is biased to spring closed, is held in place by the apparatus. With the valve thus secured, the tripping mechanism for the emergency shutoff valve can be disconnected from the valve stem and exercised, tested, or serviced. Additionally, the valve stem can be moved or exercised to assure its operability and to dislodge deposits or corrosion from the valve stem. Movement of the plunger is limited by retainer means that restrict movement of the plunger relative to the frame. By this arrangement, the valve stem can be exercised through a predetermined range of motion without risk of substantially interrupting the flow of steam through the emergency shutoff valve.

대표청구항 ▼

[ What is claimed is:] [1.] An emergency shutoff valve exerciser for a valve steam of an emergency shutoff valve of a steam turbine, comprising:a frame connected to the body of the steam turbine shutoff valve for supporting the components of the emergency shutoff valve exerciser;a plunger matingly a

[ What is claimed is:] [1.] An emergency shutoff valve exerciser for a valve steam of an emergency shutoff valve of a steam turbine, comprising:a frame connected to the body of the steam turbine shutoff valve for supporting the components of the emergency shutoff valve exerciser;a plunger matingly attached to the upper end of the valve stem of the emergency shutoff valve and fitting through said frame for enabling vertical reciprocal movement of the valve stem by vertical reciprocal movement of said plunger; anda retainer engaged with said plunger and engaged with said frame for restricting the vertical reciprocal movement of said plunger relative to said frame so that exercising of the valve stem is limited to a selected range of motion;wherein said frame includes an upper member with a threaded opening for receiving said retainer and said plunger, said retainer and plunger being concentrically engaged with one another.