Fluid proportioning system with automatic control

Claim 1

A FLUID FLOW CONTROL DEVICE, INCLUSING: A CONDUIT FOR CONVEYING A FLUID; A PULSE GENERATOR OPERATING TO GENERATE A TRAIN OF PULSES DURING A TIME INTERVAL; A CONTROLLER INCLUDING A SELECTOR SWITH MEANS, STEPPABLE TO DIFFERENT POSITIONS, RECEPTIVE OF PULSES FROM SAID PULSE GENERATOR, AND ACTING TO DELIVER FROM SAID PULSE TRAIN A DIFFERENT INTEGRAL NUMBER OF PULSES FOR EACH POSITION OF SAID SWITCH MEANS; CONTROL MEANS RESPONSIVE TO THE PULSES DELIVERED BY SAID SWITCH MEANS, FOR CONTROLLING THE FLUID FLOW IN SAID CONDUIT, SAID FLOW AFFECTING A MEASURED PHYSICAL CHARACTERISTIC ASSOCIATED WITH A BLEND OF FLUIDS OF WHICH SAID FLUID FORMS A COMPONENT; MEANS FOR SENSING VARIATIONS FROM A PREDETERMINED VALUE IN SAID MEASURED PHYSICAL CHARACTERISTIC; AND MEANS OPERATED BY SAID SENSING MEANS, UPON THE OCCURRENCE OF A VARIATION IN SAID PHYSICAL CHARACTERISTIC FROM SAID VALUE, TO AUTOMATICALLY STEP SAID SWITCH MEANS TO A NEW POSITION SUCH AS TO REDUCE THE ETENT OF SAID VARIATION.