Category Archives for Hydraulic Valves
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. … Continue reading
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 … Continue reading
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 … Continue reading
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 … Continue reading
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 … Continue reading
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, … Continue reading
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 … Continue reading
Yuken Proportional Electro-Hydraulic Relieving and Reducing Valves with On Board Electronics
These valves are a combination of a proportional electro hydraulic pilot relief valve and a pressure reducing and relieving valve. They can control hydraulic system pressures proportionally to the controlled input voltage. As the valves have a relieving mechanism, a … Continue reading
Yuken Proportional Electro-Hydraulic Directional and Flow Control Valves with On Board Electronics
These valves are a combination of a directional and flow control valve and a power amplifier. The flow rate can be controlled by changing an input voltage to the solenoids, and the direction of the flow can be controlled by … Continue reading
Yuken Proportional Electro-Hydraulic Relief Valves with On Board Electronics
These valves consist of a proportional electro-hydraulic relief valve, a power amplifier, and a pressure sensor. They can control hydraulic system pressures proportionally to the controlled input voltage.