Anti-pumping dispense valve

Details Anti-pumping dispense valve Anti-pumping dispense valve

2005-01-04

2005-01-04

Hirsch, Paul J. (Department: 3754)

Valves and valve actuation

Reciprocating valve

Diaphragm

C251S324000

Reexamination Certificate

active

06837484

ABSTRACT:
Anti-pumping dispense valves, constructed according to principles of this invention, comprise a fluid transport housing having a fluid inlet passage extending into the housing, a fluid outlet passage extending out of the housing, and a fluid transport chamber disposed within the housing. The fluid transport chamber includes an valve seat. An actuator housing is attached to the fluid transport housing and includes an actuator chamber that is in contact with the fluid transport chambers. A diaphragm/poppet assembly is disposed within the fluid transport chamber and comprises a poppet positioned downstream of the seat for placement against the seat to stop fluid flow through the first fluid transport chamber. An actuator is disposed within the actuator chamber for moving the diaphragm/poppet assembly. Dispense valves of this invention operate to provide a slight vacuum within the fluid flow passageway in the valve to retain or pull back into the valve any nondispensed liquid, thereby eliminating and/or greatly reducing the possibility product contamination via unwanted excess liquid dispensement or dried residual liquid dispensement.

REFERENCES:
patent: 6000416 (1999-12-01), Kingsford et al.
patent: 6196523 (2001-03-01), Miyata et al.
patent: 6349858 (2002-02-01), Kingsford et al.

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