A zone valve control system for a flow valve comprising a direct current rotary electric motor connected to a valve shaft, an electronic control system comprising a microprocessor, an electric measuring device for signaling the presence of a predetermined electrical stall current, a rectifier and a regulator to convert and regulate external AC voltage to a desired DC power output; and an electrical storage system having a total storage capacity sufficient to power the DC electric motor to move the valve between the closed and opened positions; an external sensor for signaling when a certain condition exists in an external zone; the microprocessor controlling the flow and polarity of DC current to the motor; whereby the electronic control system controls movement of a valve operably connected to the output shaft to open or close a valve to maintain a desired predetermined condition in the external zone.

A system and method of injecting a chemical into a high pressure process stream without pumps or other active components. The system utilizes the differential pressure created by resistive losses of downstream components within a high pressure process stream. A bypass side stream is taken from an upstream pressure location and returned to the downstream side of the resistive inline process component. The chemical solution vessel is pressurized by the higher side of the pressure differential. The solution then passes through a flow controlling capillary tube exiting on the lower pressure differential side into the bypass stream. The high flow rate chemically diluted bypass stream then returns to the process stream at the lower differential process stream tie-in. The chemical solution is isolated from the process water pressuring the vessel by a movable separating device preventing mixing of the two fluids. The vessel can also be pressurized by gas.