Servo valve animation

If you continue browsing the site, you agree to the use of cookies on this website. An electrohydraulic servo valve (EHSV) is an electrically operated valve that controls how hydraulic fluid is sent to an actuator. Technical animation - Duration:. Servo valves are often used to control powerful hydraulic cylinders with a very small electrical signal.

Difference of Traditional Control Valve , Proportional Control Valves , Servo Control Valves.

And because the system is closed-loop, feedback is directed to the servo valve. This feedback enables the servo valve to generate a more accurate response to the received command. Servo Basics A servo contains a small motor and gear box that rotates a shaft to a precise location and holds it there.

This photo shows a typical servo with its top removed. The position of the shaft is based on a digital signal. Most servos rotate through a 1degree arc while delivering a good bit of torque.

To hold these kinds of tolerances requires more than a go, no-go hydraulic control valve. Servo directional valves are 4-way, 3-position spool valves with all ports blocked in the center position.

This article will explore the technology used in these proportional and servo valves as well as attempting to shed some light as to what type of valve may be most appropriate for a given application. These electronic components have been specially designed and assembled for high reliability and improved ease of use. They can be applied in systems utilizing Vickers servovalves and proportional valves and may also be used to control competitors’ valves. EM series power supplies and the SMC 20H controller are.

The Festo product range, from controllers to drives, makes it extremely easy to implement servopneumatic systems. The design of the displacement encoder varies according to the task, use or location: absolute, contactless and incremental or potentiometric. This led us to formulate the following definitions of servo and proportional valves : Servovalve — Any continuously variable, electrically modulate directional control valve with less than center overlap. Proportional valve — Any continuously variable, electrically modulate directional control valve with more than center overlap. I think the close-loop system have to know how to auto-tune input voltage to servo valve.

VI which can auto-tune input voltage under different specimen and let actuator go forword at a constant velocty. Don’t tap the valve with tools. Tremendous forces can be generated with the simple tap of a hammer or wrench, which can damage a servovalve.

If you suspect a stuck spool, any hammer tapping will cause more damage to the valve than good gained by unsticking the spool. The third type of hydraulic directional control technology is the servo valve. Servo valves operate with very high accuracy, very high repeatability, very low hysteresis, and very high frequency response.

Electrohydraulic, continuously acting valves that transform a changing analog or digital input signal into a stepless hydraulic output (flow or pressure). The term servovalve describes a valve design with bushing spool assembly, characterized by high precision metering edges.

The term proportional describes valves with a spool-in-body design.