Precision fluid dispense valve

Details Precision fluid dispense valve Precision fluid dispense valve

1982-02-11

1984-12-25

Tollberg, Stanley H.

Dispensing

Motor operated outlet element

251 65, 251139, 251141, F16K 3108

Patent

active

044898630

ABSTRACT:
A micro dispense valve arrangement for accurately dispensing minute quantities of a fluid. The valve arrangement interfaces an enclosed interior region under pressure with an exterior region of less pressure through an orifice opening. The orifice wall is tapered from interior to exterior to bound a frustoconical region constricting toward the exterior to accommodate a magnetizable pellet or ball. The ball is held in its seated position against the orifice wall by permanent magnets imbedded in the wall. An AC coil surrounding the orifice opening acts when energized to cause the ball to move between its seated or closed position and a non-magnetizable screen in its open position. The frequency and duration of applied positive and negative pulses driving the coil act to control the on/off fluid flow duty cycle of the valve.

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The Review of Scientific Instruments, "An Inexpensive Electronically Controlled Constant Rate Addition Funnel, P. S. Engel, Nov. 1972, pp. 1707-1709.

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