Electrical control system for automatic metering valve

An electrical control system for an automatic metering valve delivering a preset quantity of a fluid and including a housing for the valve;

• a rotary impeller disposed within the housing and rotatable at a velocity in accordance with the rate of delivery of the fluid;
• and an automatic shut-off mechanism for turning-off the valve when the preset quantity of fluid has been delivered;
• said control system including a sensible element disposed internally of the valve housing and rotated with the impeller, a sensor sensing the sensible element to produce electrical signals corresponding to the number of rotations thereof and of the impeller, a presettable counter circuit effective to count said electrical signals, a switching circuit effective to actuate the valve shut-off mechanism to turn-off the valve when the counter circuit reaches a preset number corresponding to the preset quantity of fluid to be delivered, and a presettable timer effective to actuate the valve shut-off mechanism to turn-on the valve after the elapse of a preset time interval, said presettable counter circuit including a digital counter, a sensor output circuit for incrementing the digital counter by said sensor electrical signals, a timer producing timing electrical signals, a timer output circuit for incrementing the digital counter by said timer electrical signals, a quantity presettable device for presetting the counter according to the predetermined quantity of fluid to be delivered, a timer presettable device for presetting the counter according to the time the fluid is to be delivered, and enabling means to selectively enable the counter to produce an output signal to actuate the valve shut-off mechanism when the counter has been incremented to the present value of either the quantity presettable device or of the timer presettable device.