DEWATERING SYSTEM WITH VORTEX VALVE

摘要

A dewatering system is disclosed in a papermaking machine for removing water from a web such as a paper sheet made of pulp. The drainage system includes a vacuum or suction box, a separator for separating solids and/or liquids from the drainage, and a vortex valve connecting the separator to vacuum. Advantageously, the vortex valve operates to maintain a substantially constant pressure at the separator outlet independently of the gas flow through the valve.