| 摘要 |
<p>A method of detecting a bellows failure in a control valve comprising:
sensing travel of a valve stem in the control valve;
sensing a pressure in a bellows chamber, the bellows chamber formed from a bellows that is attached to a first portion of the valve stem and a valve packing member that is attached to a second portion of the valve stem; and
generating an indication of a bellows failure when a change of pressure in the bellows chamber does not correspond to a travel of the valve stem.</p> |
