Pulp & Paper
This industry is defined by wear, contaminants, & corrosion. Valve failure seems to be a way of life and the down-time can ravage plants and brutalize business efficiency.
Cornerstone Valve has solutions for your most extreme pulp and paper challenges:
The process of pulp and paper development call for high ph levels, abrasion, and extreme pressure in steam and water systems. Continuous and batch digesters’ valves suffer from the brutal conditions needed to remove lignin – yet they are crucial to the efficiency and uptime reliability of a business.
Cornerstone’s engineers create specific solutions for these unique needs. Critical valve areas – trunnions, seat spools – are isolated from the media to assure that valves operate even with excessive deposition. Seats are heavily and continuously loaded against the ball sphere to assure a scraping action for constant self-cleaning. Solids proofing and
judicious selection of coating systems make the crucial difference.
Cornerstone’s Black Liquor valves were installed in a pulp mill in 1996. They still
operate – day in and day out.
A Pacific Northwest pulp mill replaced valves in their continuous digester
every 2-4 months. Two different brands of valves had been tried and repeatedly failed.
They called Cornerstone.
Our experienced engineers prescribed trunnion-mounted blowdown valves. The valves operate even with heavy deposits of carbon or lignin because the seats are heavily and continuously loaded against the ball sphere to assure a scraping action that self-cleans the valve.
After two years of service (not
2-4 months) Cornerstone’s workhorse valves still operate in “as new” status.