Patent ID: 6105829
Filing Date: 2000-08-22
Classification: B01D,F04B,Y10S,Y10T

Abstract:
In a device for dispensing an industrial fluid which is viscous and/or high purity and/or shear-sensitive, the combination of: first pumping means; and second pumping means adapted to receive said fluid after said fluid has been pumped by said first pumping means, said second pumping means including a diaphragm-type pump actuated by displacement of a relatively incompressible fluid, whereby said first pumping means draws said fluid from a reservoir and said second pumping means subsequently receives said fluid and said fluid is subsequently dispensed from said second pumping means; and means for dispensing said fluid from said second pumping means at intervals independent of operation of said first pumping means, said second pumping means being configured to selectively suck-back fluid after said fluid is downstream of said diaphragm.