Introduction to Proportional (Servo) Valves (Full Lecture) 

In this lesson we'll take a brief introductory look at proportional (servo) valves. We'll discuss how proportional valves serve to control both flow rate and direction as well as examine proportional valve construction. We'll learn that proportional valves are electrically actuated continuously variable combinations of flow control valves and directional control valves integrated in the same package that lend themselves to advanced functionality. We'll examine proportional valve performance data, specifically, flow rate as a function of applied voltage and discuss dead band, hysteresis, overlapped, and line to line spools, and observed non-linearities. Additionally, we'll examine hysteresis compensation via closed loop control of spool position using the internally generated feedback provided by a spool position transducer know as an LVDT. Additionally, we'll briefly introduce acceleration and deceleration control made possible by ramp generators. Finally, we'll briefly discuss filtration and fluid requirements and maintenance and service procedures unique to proportional valves. (Full Lecture)
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