21JN1S 

21JN1S are proportional valves driven by a bipolar stepper motor. Thanks to this type of technology it is possible to minimize the effects of hysteresis and to improve the response time and the repeatability of performance over time. Minimum operational pressure is not required. This motorized valve can be associated to a control driver that can be interfaced with PLC systems, 4-20 mA and 0-10 V. Please see Driver in Chapter Control & Automation.