Emergency shutoff valve exerciser for steam turbine and methods

Details Emergency shutoff valve exerciser for steam turbine and methods Emergency shutoff valve exerciser for steam turbine and methods

1998-10-13

2000-07-04

Hepperle, Stephen M.

Fluid handling

With repair, tapping, assembly, or disassembly means

Assembling, disassembling, or removing cartridge type valve

137495, 251 89, 251 90, F16K 4300

Patent

active

060823933

ABSTRACT:
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.

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patent: 5622205 (1997-04-01), Petersen

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