Application Challenges
Control valves within a sky vent system of a power plant bypass steam around the turbine to the atmosphere to ensure the unit doesn’t come up to temperature too quickly. Sky vent control valves are crucial to operational efficiency by working quietly during dump operation and providing tight shutoff during normal operation, preventing valuable steam leakage. They face the following challenges:
- High pressure and temperature steam
- Control valve leakage
- Excessive noise level
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Sky Vent Control Valve Opportunities
Withstand Hazardous Environments
Sky vent control valves often have failures resulting from damages to the positioner caused by high-temperature radiation and/or piping vibration. Conventional positioners used on these valves also tend to suffer from inaccuracy and failures due to wear and tear of the mechanical linkages. These failures can lead to unplanned downtime and production losses.
Linkage-less, non-contact Fisher FIELDVUE digital valve controllers are paired with Fisher control valves to improve sky vent valve performance and reliability. With no linkage to wear, loosen, corrode, or vibrate, FIELDVUE digital valve controllers can handle harsh environments. A remote mount option is suited for high ambient temperature and/or piping vibration.
