This ensures a long life for the actuator, even at high loads and high speeds. All rolling members are rigidly supported by bearings, making the actuator capable of operating at armature speeds of 3,000 rpm. In addition, the critical elements of the GS actuators are sealed within the actuator's extruded aluminum casing, protecting them from the particles and corrosives found in most industrial environments. Improving Batch Control With a dual-stage preset capability, the Flowstar 2003 Batch Controller was designed by Hoffer Flow Controls in Elizabeth City, N.C., to improve the control of fluid sent to a batch by closing valves gradually. This device is particularly suitable for meeting environmental regulations of process fluids, such as solvents in coating.
Chemical plants use the controller for accurate batching and blending.
In a dual-stage function, the batch controller monitors the amount of fluid passing through its flow sensor. As the flow total approaches the final batch quantity selected, the flow rate is throttled back to a fraction of its peak fill rate. The controller continues to monitor the reduced flow rate until the final batch quantity is obtained. This process eliminates overrun because less fluid is flowing when the valve is finally shut off. A truck manufacturer installed a Flowstar 2003 and a Hoffer Mini-Flowmeter outside a paint booth that sprays truck chassis.