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A!R VALVE LOAOiNG A!R
CYLINDER SPRING SOLENOID VALVE
Fig. 7. Detail of upper valve mechanism of turbulent processing unit.
flushing time period can be set on a separate timer in preparation for the following fluids. A 30-min timer has also been mounted on the panel to permit automatic developing for longer periods of time. These timers have an accuracy of J sec over their entire range. Inasmuch as it was expected to operate the entire equipment in total darkness, and in order to permit emergency disconnection in case of failure of the equipment, a bar was provided across the front of the panel which actuated the main contactor, disconnecting all valves and motors, when depressed. A reset button was mounted behind this emergency bar.
Two pressure gauges were installed on the control panel to read the input and output pressure of the film chamber. A stainless-steel flow meter (Shutte & Koerting Co., Size 6 Rotameter) was installed to permit an accurate measurement of volume flow of the fluids going through the chamber.
The valves used in this machine were stainless steel, Ij in. in diameter operated by compressed air. The air cylinders were controlled in pairs from a two-way pilot valve in such a way that either the by-pass valve or the intake valve was open at all times. The pilot valve automatically reversed the position of the two valves when actuated, and a suitable delay was built into the pilot valve system so that the by-pass valve would not close until the channel intake valve was open. The four exhaust valves were each controlled by their individual electrically operated pilot valves.
All plumbing between the valves and the chamber was either stainless steel or Carlon.* In addition a water line was built into the system controlled by a hand-operated stainless-steel valve
* Carlon Products Co., 10225 Meech Ave., Cleveland 15, Ohio.
Katz and Esthimer: Turbulent Fluid Processing
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