To intermittently discharge a powder fluid of every kind such as an adhesive, clean solder, a phosphor, grease, a paint, a hot melt, chemicals, food or the like at a high speed without compressing and destroying a powder in the production process in a field of electronic parts, household electric products or the like.

A sleeve is axially moved and the pressure generated by changing the gap of the pump chamber between the end surfaces of the sleeve is utilized to perform intermittent coating. At the time of waiting for coating, the discharge of the fluid is cut off by the radial dynamic pressure seal provided in the downstream side of the pump chamber.