| 摘要 |
<p>An apparatus for exercising an emergency shutoff valve of a steam turbine manufactured by Elliott Co., frame sizes AYR, BYR, BYRH, BYRHH, CYR, DYR, and E-Line turbines with standard Elliott Trip systems and methods for installing an d operating the same. A frame of the apparatus mounts on top of an emergency shuto ff 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 eme rgency 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, t ested, or serviced. Additionally, the valve stem can be moved or exercised to assure it s 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 relat ive to the frame. By this arrangement, the valve stem can be exercised through a predetermi ned range of motion without risk of substantially interrupting the flow of steam thr ough the emergency shutoff valve. Where practical, the emergency shutoff valve exerciser is preferably stainless steel, which has enhanced corrosive-resistant properties. T he apparatus thereby extends the uninterrupted service life of the emergency shutof f valve by insuring the operability of the valve and providing means for maintaining the valve and other related components without shutting down the steam turbine.</p> |
