Dual stage pump system with pre-stressed diaphragms and reservoi

Details Dual stage pump system with pre-stressed diaphragms and reservoi Dual stage pump system with pre-stressed diaphragms and reservoi

1993-05-17

1996-02-13

Thorpe, Timothy S.

Pumps

Condition responsive control of pump drive motor

Plural pumps having separate drive motors, supply sources,...

417 38, 417 441, 417253, 417254, 417313, 417426, 417428, 417540, 2104161, F04B 1300, F04B 2302, F04B 2306, F04B 3916

Patent

active

054907659

ABSTRACT:
An improved dual-stage pump system is provided for the accurate pumping and filtering of viscous fluids. Two hydraulically activated pumps are provided in series with a filter and reservoir disposed in-line between the two pumps. The reservoir acts as a source bottle for the second pump and allows the first pump to pump the viscous fluid through the filter at a rate independent of the dispensing rate of the second pump. By operating the first pump at a rate independent of the second pump, back pressure at the filter is avoided. Each hydraulically activated diaphragm pump is equipped with an improved diaphragm that is pre-formed to the geometries of the process fluid cavity thereby eliminating any inaccuracies in the operation of the pumps due to expansion of retraction of the diaphragm during pump operation.

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