Brownstock Rejects

Pulp from cooking always contains some unwanted solid material. Some of the fibrous material may not be completely in the form of individual fibers. The main purpose of the pulp screening process is to separate harmful impurities from pulp with minimal fiber loss, and at an acceptable cost level. Bark, sand, shives, and rocks are typically found within the cooked chips and must be removed. It is important for these impurities to be removed from the process stream as it can have negative effects on end product quality, may damage downstream process equipment, and may cause operational problems.

The Fisher V150S Slurry Vee-Ball valve mates with CL150 raised face flanges. Rugged construction, highly wear-resistant trim materials, and an unrestricted straight through flow path make the design ideal for controlling the most abrasive of slurries.
The V150S utilizes reverse flow design to direct flow away from the valve body. The downstream portion of the valve has been extended so that the valve itself will be exposed to the region of highest flow velocity, instead of the downstream piping. A PSZ ceramic flow ring insert is used to protect the valve in this region in order to prevent the ball from erosion.