Category Archives for Servo Valves

Hydraulic Servo Valve Port Shape

Servo valve bodies are machined with three common port shapes as shown in Fig. 11.13. The effect of port shape on flow is shown in Fig. 11.14. A full annulus port gives the highest flow per unit of spool displacement … Continue reading

15. May 2010 by and
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Jet Pipe Hydraulic Servo Valve Spool

The jet pipe design (Fig. 11.12) is less sensitive to contamination than the flapper nozzle. This design uses fluidics technology. A nozzle, attached to the armature, directs a stream of fluid (pressure Ps) at two receivers. When the nozzle is … Continue reading

15. May 2010 by and
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Double Flapper Nozzle Shifting Servo Valve Spool

A diagram of the double flapper nozzle is shown in Fig. 11.10. Supply pressure (the setting of the relief valve or the setting of a pressure compensated pump) is supplied to the points identified with Ps (Fig. 11.10). Fluid flows … Continue reading

14. May 2010 by and
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Hydraulic Servo Systems

There are four basic servo systems as shown in Fig. 11.7. The two servo-actuator systems are (1) valve-motor and (2) valve-cylinder. These systems are often referred to as servo motors and servo cylinders. The recommended procedure is to mount the … Continue reading

14. May 2010 by and
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Hydraulic Servo Valve Feedback

Feedback is an intuitive concept. Each time we reach for an object, we slow our hand as it approaches the object so that it is captured with minimal impact. There is visual feedback that our brain uses to control the … Continue reading

14. May 2010 by and
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