Labyrinth disk stack having disks with integral filter screens

A device for subjecting particulate fluid flow to a labyrinth passage between the inlet and outlet of the device comprising:

• a multi-turn labyrinth disk stack with integral inlet filter having a series of disks with inlet and outlet circumferences forming the inlet and outlet of said disk stack;
• means for allowing fluid flow in the device to flow from the inlet circumference of the disk stack to the outlet circumference of the disk stack;
• each disk of said series having a series of small area openings located around the entire inlet circumference of said disk forming an inlet filter for the particulate fluid flow through the device and leading to a large circumferential passageway;
• each of said series of disks having a series of multi-turn passages located proximately to said large circumferential passageway, each multi-turn passage having a substantially constant area significantly larger than the area of each of said series of circumferential passages to prevent the blocking of the passageway by a particle of the particulate fluid flow passing through the inlet filter of said disk;
• and
• outlet means located on each of said series of disks proximate to said multi-turn passages to exhaust the particulate fluid from the disk stack of the device.