Chamber valve

Details Chamber valve Chamber valve

1998-09-25

2000-03-14

Douglas, Steven O.

Valves and valve actuation

Tube compressors

Perpendicularly reciprocating tube contacting element

222207, 222214, F16K 704

Patent

active

060361662

ABSTRACT:
A valve having a linear actuator operating a tube compression rod. The rod is held in a common axial orientation with a section of flexible tubing that runs through the valve and is rigidly held therein between the compression rod and a tube platen. The flexible tube section is fluidly connected on one end thereof to a pump that delivers a viscous material thereto from a source thereof. The opposite end of the flexible tube section is fluidly connected to a dispense point. In operation, the linear actuator is operable between an extended position wherein the compression rod moves to partially occlude or compress the flexible tube section against the tube platen, and a retracted position wherein the flexible tube section is not compressed. Dispensing of the viscous substance is commenced by actuation of a switch operating the pump. During operation of the pump, the chamber valve is in its extended position wherein the flexible tube section is partially occluded. When sufficient viscous substance has been dispensed, the pump is turned off. At the same time the chamber valve is operated to move to its retracted position. Such movement results in the flexible tube section moving to its non-occluded position whereby a suction force is applied to the viscous substance at the dispense point. As a result, a small volume of the viscous material is moved away from the dispense point in the reverse direction of its normal flow for preventing dripping thereof from the dispense point.

REFERENCES:
patent: 3212671 (1965-10-01), Rock
patent: 5033656 (1991-07-01), Blette et al.
patent: 5439146 (1995-08-01), Niss
patent: 5551599 (1996-09-01), Niss

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