Electrically actuated variable flow control system

Details Electrically actuated variable flow control system Electrically actuated variable flow control system

1990-09-10

1992-08-04

Beck, Shrive

Coating apparatus

Control means responsive to a randomly occurring sensed...

Responsive to attribute, absence or presence of work

118300, 239 67, 239 71, 239101, B05C 1100

Patent

active

051349612

ABSTRACT:
An electrically-actuated liquid spraying system for controlling the volumetric flow through pressure-atomization spray nozzles is disclosed. Each nozzle is attached to a direct acting, in-line solenoid valve which is connected to a liquid supply at constant pressure. The valve is excited by square wave pulses of variable frequency and duty cycle to reciprocate between its fully open and closed positions and thereby control the flowrate over a range without changing droplet size and spray pattern. The frequency and duty cycle of the square wave pulses are varied and controlled by feedback data of relative target movement, size, shape and other factors as well as by gated sampling of the dynamic pressure in a region between the valve seat and nozzle orifice.

REFERENCES:
patent: 3747858 (1973-07-01), Krynicki
patent: 4164001 (1979-08-01), Patnaude
patent: 4590576 (1986-05-01), Elpiner
patent: 4823268 (1989-04-01), Giles et al.

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