Valve control with mechanical memory

A control for controlling a valve having a valve actuator to discharge a fluid into a reservoir and for controlling a chemical dispenser for admitting a dosage of a chemical treatment in proportion to the quantity of fluid discharged into the reservoir, comprising;

• a first rotatable cam having a first cam surface that engages the actuator for the valve to open the valve;
• means responsive to a signal for initiating the discharge of the fluid into the reservoir and operative to rotate the first cam at a constant speed through one or more complete revolutions while the signal is present;
• a low speed motor having an output shaft mounting a second cam;
• an impulse switch having an actuator engaged by a second cam surface of the first cam, said impulse switch being actuated during a small portion of each complete revolution of the first cam and connected to energize the low speed motor while the impulse switch is actuated;
• and
• a dispenser switch actuated by the second cam and controlling the operation of the chemical dispenser.

A control for controlling a valve having a valve actuator to discharge a fluid into a reservoir and for controlling a chemical dispenser for admitting a dosage of a chemical treatment in proportion to the quantity of fluid discharged into the reservoir, comprising:

• a float switch in the reservoir that is actuated when the fluid in the reservoir is below a preselected level;
• a cam shaft mounting a first rotatable cam having a first cam surface that engages an actuator for the valve to open the valve;
• means responsive to the actuation of the float switch to rotate the cam shaft at a constant speed through one or more complete revolutions while the float switch is actuated;
• a low speed motor having an output shaft mounting a second cam;
• an impulse switch having an actuator engaged by a second cam surface of the first cam, said impulse switch being actuated during a small portion of each complete revolution of the first cam and connected to energize the low speed motor while the impulse switch is actuated so as to rotate the output shaft through a discreet increment for each actuation of the impulse switch;
• and
• a dispenser switch actuated by the second cam for controlling the operation of the chemical dispenser.

A method of dispensing a dosage of a chemical additive in proportion to the quantity of a fluid added to a reservoir, comprising:

• discharging successive units of a fixed quantity of the fluid into the reservoir;
• providing a short energizing pulse to a low speed motor for each unit of the fixed quantity of fluid discharged;
• rotating a cam by the motor one increment for each pulse to the motor;
• and
• actuating a switch that dispenses a dosage during a portion of a complete revolution of the cam.

A valve for controlling the flow of a fluid, comprising;

• a fluid inlet manifold;
• a fluid outlet manifold;
• a pair of valves connected in parallel between the inlet and outlet manifolds, each of said valves having a valve actuator;
• a first rotatable cam having a pair of first cam surfaces each engaging one of the valve actuators to open the valves;
• means for rotating the first cam at a constant speed through one or more complete revolutions;
• a low speed motor having an output shaft mounting a second cam;
• an impulse switch having an actuator engaged by a second cam surface of the first cam, said impulse switch being actuated during a small portion of each complete revolution of the first cam to energize the low speed motor while the impulse switch is energized;
• and
• a further switch actuated by the second cam to provide a signal the frequency of which is proportional to the quantity of fluid flowing through the two valves.