Cybor Corporation

Other

Integrated Designs, L.p.

Carl A Martin

David C Bailey

Raymond T Savard

Gary Minor

Vernon H Foersterling

Darko Hadzidedic

A system and method for reducing the time for charging a filter in a liquid dispensing system, such as one utilizing a positive displacement pump, is disclosed. The filter is located at the input side of the pump between the source of the liquid and the pump. In order to prevent air from the filter from entering the pump a reservoir is provided between the filter and the source of the fluid. Air from the filter is vented into the reservoir through a vent tube. A vacuum is used to draw air from the filter and, through the reservoir.

Liquid dispensing system with enhanced filter

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.

Dual stage pump system with pre-stressed diaphragms and reservoir

A corrosion resistant check valve having plastic components in the fluid path is provided. The check valve broadly comprises an inlet housing, an outlet housing, a valve poppet, and a spring. The inlet housing has an inlet passageway and the outlet housing has an outlet passageway. The inlet housing and outlet housing are connected to define an internal chamber of the check valve. An inner portion of the inlet housing has a transverse wall which includes a valve seat surface and a central hole which defines a flow passageway between the inlet passageway and the internal chamber. The valve poppet is disposed within the internal chamber and has a disk-shaped body and a stem extending perpendicularly outward from a centerpoint of the body. The stem of the valve poppet is positioned in a central bore in a planar end surface of the spring. The planar end surface of the spring also includes fluid flow passages disposed about the central bore. In operation, the spring biases the valve poppet into sealing engagement with the valve seat surface to control fluid flow from the inlet passageway into the internal chamber. When the fluid pressure in the inlet passageway exceeds the biasing force of the spring, the valve poppet unseats from the valve seat surface and fluid flows around the valve poppet, through the fluid flow passages in the spring and out of the outlet passageway.

Check valve

Dual stage pump and filter system with control valve between pump stages

A precision liquid dispenser embodying the present invention includes a displacement diaphragm pump and a hydraulic system for selectively deforming the diaphragm. The diaphragm pump includes a pump body, a pump cavity, a pump diaphragm, and an input/output port. A solenoid operated valve assembly selectively connects the port to a source of liquid to be dispensed. The hydraulic system for selectively deforming the diaphragm includes a body with a cavity, a piston, a sealing ring, and hydraulic fluid in the space between the piston and diaphragm. The position of the piston is controlled by a stepping motor, a mechanical threaded coupling, which converts rotary motion of the motor output shaft to linear motion of the piston. The volume of fluid dispensed is determined by the number of pulses applied to the stepping motor. The output flow rate as a function of time is controlled by the rate of pulses applied to motor as determined by the control logic. A solenoid valve assembly, under the control of signals from the dispenser control logic, selectively connects a valve input port to the valve input/output port, or connects the input/output port to a valve output port. Valve control signals from control logic are coordinated in time with control signals from the reversible motor.

Growing community of inventors

Fremont, CA, United States of America

Carl A Martin