Category: Servo Valves

Double Acting Cylinder

{0 Comments}

Double Acting Cylinder

This is a standard cylinder that produces reciprocating motion. It is available in single and double rod types. Fig. 10.1 shows the single rod cylinder. This cylinder is provided with a cushion mechanism, which uses a cushion sleeve to close the fluid return port as the piston rod retracts. Therefore, the fluid is discharged through […]

Read More…

Energy Saving Hydraulic System with Rotational Frequency Control

{0 Comments}

Energy Saving Hydraulic System with Rotational Frequency Control

Conventional servo systems using servo valves generally operate with hydraulic power sources that produce excess load flow and pressure. Therefore, such systems involve heat and power loss caused by excess flow, as well as considerable pressure loss through the valves. On the other hand, systems with rotational frequency control regulate the motor speed so that […]

Read More…

Description of IH Servo Drive Pack

{0 Comments}

Description of IH Servo Drive Pack

The IH servo drive pack drives the pump with an AC servo motor, and the pump supplies pressured oil bidirectionally. This results in a simple hydraulic control system where the load cylinder is simply connected to both outlet ports without control valves. The pump draws oil by using the self priming valve to compensate oil […]

Read More…

Servo Systems with Pump Speed Control

{0 Comments}

Servo Systems with Pump Speed Control

Simple servo systems, which do not use hydraulic servo valves or high-speed proportional valves, can be made by controlling the pump rotation speed with a servo motor. Fig. 9.13 shows an example of a simple servo system with pump speed control (IH servo drive pack). The IH servo drive pack is a compact and energy-saving […]

Read More…

Servo Amplifiers

{0 Comments}

Servo Amplifiers

Servo amplifiers drive servo valves, based on the same principles as the amplifiers for proportional electro-hydraulic control. Table 9.3 lists the functions and features of the servo amplifiers and related devices. Fig. 9.10 and Table 9.4 give a circuit example and specifications, respectively.

Read More…

Direct Drive Servo Valves

{0 Comments}

Direct Drive Servo Valves

The valves directly drive a spool with a small and high-power linear motor. Direct drive servo valves electrically send the spool position data to the controller to provide quick response and high contamination resistance. These valves are available in two types: direct spool control and pilot operation (a combination of small valves). Figure 9.7 shows […]

Read More…

Electro-Hydraulic Two-Stage Servo Valves

{0 Comments}

Electro-Hydraulic Two-Stage Servo Valves

Nearly all types of servo valves are based on common principles. Electro-hydraulic two-stage servo valves generally operate with force feedback. Given that valve pressure drop is constant, the valves control the output flow in proportion to the input signal. Therefore, they can be used to drive a hydraulic cylinder or motor at a speed proportional […]

Read More…

Servomechanism (Tracking Mechanism)

{0 Comments}

Servomechanism (Tracking Mechanism)

A servomechanism is an automatic control system designed to operate in accordance with input control parameters. The mechanism continuously compares the input signal to the feedback signal to adjust the operating conditions for error correction. Commercially available servo systems vary according to their methods for error detection, amplification, communication, and output. Hydraulic servo systems have […]

Read More…
You might also likeclose