Browse Prior Art Database

Original Publication Date: 1992-Feb-29
Included in the Prior Art Database: 2004-Apr-05

Publishing Venue

Xerox Disclosure Journal


A device which combines a hydraulic metering system with a process fluid delivery system with matching output in fluid flow is disclosed. This device isolates two incompatible fluids while maintaining precise control over the volume and flowrate of the discharged fluid. The device consists of: a hollow cavity created by two pump body halves; an impervious elastomeric diaphragm membrane which separates the two body halves; and a clamping ring or plate which secures the membrane to the hydraulic fluid half of the device. The device is a fluid transformer with a hydraulic metering pump as the primary driver. Hydraulic fluid metered into one side of the device cavity expels an equivalent amount of coating solution from the opposite side of the membrane. Conversely, when the metering pump withdraws hydraulic fluid from the device cavity an equivalent amount of solution is drawn into or allowed to refill the cavity created by the deflection of the the membrane. The direction of fluid flow is controlled by valved inlet and exit ports. The device maybe used in critical coating fabrication steps of multilayer organic photoreceptors enabling product of very high quality. A unique internal contour of the cavity that matches the deformation of the elastomeric membrane, and proper orientation of the device enable the process fluid side to be automatically primed/purged of air bubbles prior to operation, and to be automatically cleaned and flushed following operation.