Everlasting Valve Company products are uniquely suited for coal-fired power plant applications, especially in systems handling fly ash, bottom ash, and slurry service.
Key challenges include:
Across these stages, Everlasting’s rotating disc design is ideal for handling abrasive powders, dense slurries, and hot air streams that quickly wear out conventional valves.
Fine fly ash particles collected from ESPs, baghouses, cyclones, and economizers can wear valve seats, internals, elbows, and piping when isolation points are not designed for abrasive service.
Bottom ash systems expose valves to wet, abrasive slurry, seal trough service, flush water, jet pump isolation, and recirculation duties where erosion and leakage can become recurring maintenance issues.
Moisture intrusion, poor aeration, and ash accumulation can cause plugging or buildup in conveying lines, hoppers, discharge points, and valve cavities, reducing flow and shutoff reliability.
Fly ash and other dry solids moving through pneumatic conveying systems create high-velocity erosive conditions that can quickly damage conventional valves at transfer, isolation, and diverter points.
Lock hopper vent, equalization, and NuvaFeeder services require dependable cycling and shutoff under pressure changes, abrasive solids, and repeated operating sequences.
Small valve issues can create major plant reliability problems when they affect ash removal, boiler blowdown, diverter lines, pug mills, ash conditioners, or environmental control equipment.
In coal-fired power plants, fly ash is one of the most important by-products and operational challenges.
Fly ash is the fine particulate residue carried out of the boiler with flue gases when pulverized coal is burned. It consists primarily of Silicon Dioxide (SiO2), Aluminum Oxide (Al2O3), Iron Oxide (Fe2O3), and Calcium Oxide (CaO). Particle sizes are typically below 100 μm, with a glassy, spherical morphology due to the high combustion temperature.
During coal combustion:
Handling & Conveying:
Fly ash is typically collected dry and transferred through pneumatic conveying systems to storage silos.
Severe-service valves such as Everlasting Valve Company rotating-disc valves are often used to manage these flows.
Movement drives rotation providing self-lapping to enhance performance and extended life.
Positive Shut-off: Leak rates are less than industry standard ANSI B.16.34; MSS-SP61 for metal seated valves.
The spring-loaded disc is held firmly against the path that it travels.
Self-lapping disc ensures positive shut-off
Shearing action wipes media away to seal
Valve body design creates a vortex, self-cleaning
Disc pressure ensures positive seal
Value bodies are available in a wide choice of materials
EV Valves may be used for converging applications
Self-lapping disc design
Everlasting Valves are designed for the most severe applications
When you choose Everlasting Valve Company, you’re not just selecting a product—you’re gaining a partner dedicated to long-term performance and support. Our commitment to service extends far beyond standard maintenance or repair. It means timely access to our knowledgeable team of engineers and service professionals—ready to respond anytime, anywhere your operations demand.
At Everlasting, we pride ourselves on becoming an extension of your team. You can count on us to take ownership of every challenge and deliver practical, lasting solutions. When issues arise, our technical experts go beyond the symptoms to uncover the true cause. We evaluate your complete system to identify and resolve problems with precision and care.
Our comprehensive service approach is designed to maximize equipment reliability, enhance operational efficiency, and reduce total cost of ownership.
Power plants operate under severe conditions including high temperatures, pneumatic conveyed abrasive fly ash, bottom ash slurries, and high cycling valves. Conventional valves that wear quickly, leak, or bind up under these conditions. Everlasting valves are engineered specifically for these environments.
Everlasting’s patented metal seated, self-lapping rotating disc technology provides positive shut-off, self-cleaning action, and exceptional resistance to abrasion and heat. The valve improves its seal with use, resulting in longer service life and reduced maintenance.
Common services include fly ash and bottom ash handling, baghouse and precipitator isolation, diverter lines, equalization lines, and boiler blowdown service.
Each valve cycle slightly indexes the disc, while wiping away abrasive particles and lapping the sealing surfaces. This prevents buildup, reduces leakage, and distributes wear evenly.
Yes. Self-cleaning and self-lapping action minimizes trim wear and binding, significantly reducing unplanned downtime and replacement frequency.
Everlasting valves routinely replace knife-gate, butterfly, slide-gate, globe, and metal-seated ball valves in severe power plant service.
