Rexroth servo valve 4WEH16J6X/CW220-50N9ETZ in stock.

Brand

REXROTH/Germany Rexroth

Flow Direction

Other

3C Valve Category

Industry

Application Areas

Chemical, Petroleum, Mining, Road/Rail/Marine, Comprehensive

Rexroth Solenoid Valves, Rexroth Piston Pumps, Rexroth Relief Valves, Rexroth Proportional Valves, Rexroth Vane Pumps

Rexroth servo valves primarily refer to electro-hydraulic servo valves. After receiving an electrical analog signal, they output modulated flow and pressure. They are both electro-hydraulic conversion elements and power amplification elements, converting weak electrical input signals into high-power hydraulic energy (flow and pressure) output. In electro-hydraulic servo systems, they connect the electrical and hydraulic components, realizing the conversion of electro-hydraulic signals and hydraulic amplification. The electro-hydraulic servo valve is the core of the electro-hydraulic servo system control.

Rexroth servo valves are actuators in servo systems that convert electrical signal input into high-power pressure or flow/pressure signal output. They are electro-hydraulic conversion and power amplification elements. Servo valves are highly sensitive and fast, capable of converting very small electrical signals (e.g., 10 mA) into large hydraulic power (e.g., tens of horsepower or more), and can drive various types of loads. In the past, hydraulic amplification devices such as nozzle-baffle valves, jet pipes, or spool valve servo motors were also included in the category of servo valves. Since the 1970s, the term "servo valve" generally refers only to electro-hydraulic servo valves.

Rexroth servo valves are two-stage valves. The first stage is a nozzle-baffle type, where the outlet pressure is controlled by a control signal. The second stage is a spool valve type, actuating the pressure from the control stage to the brake cylinder. When there is no signal, the pressure of the pressure nozzle outlet causes the servo valve baffle to rest against the return nozzle. At this time, the oil pressure at the pressure port acts on the spool valve, directly connecting the brake port and the metering port. The brake port pressure is equal to the metering oil pressure controlled by the pilot. When the wheel angular velocity detects a deviation between the taxiing speed and the reference taxiing speed, the torque motor receives the deviation signal. The torque motor then drives the baffle to deflect towards the pressure nozzle, causing the oil pressure acting on the upper end of the valve spool to decrease. Under the action of the oil pressure at the lower end of the valve spool, the valve spool moves upward, closing the metering pressure port. This results in a decrease in the control port pressure. When the control port pressure drops to a certain value, the corresponding braking pressure is applied.

Rexroth Servo Valve Specifications 4WS.2E.

2-stage directional servo valve, mechanical or electronic feedback

Sizes 6, 10, and 16

Mounting face according to DIN 24340 Type A

Controls the direction and magnitude of flow

Suitable for closed-loop control of power, position, speed, and pressure

First stage is a nozzle/baffle amplifier

Dry torque motor

Wear-free connection between feedback element and valve spool

Position sensing of the main valve spool via a position sensor, with electrical feedback (size 10)

Integrated electronic controller (OBE) for 4WSE2E type

Model 4WSE3EE

3-stage directional servo valve, with electrical feedback

Sizes 16 to 32

Mounting face according to DIN 24340 Type A

Controls the direction and magnitude of flow

Suitable for closed-loop control of power, position, speed, and pressure

High sensitivity, extremely low hysteresis and zero drift

Position sensing of the main valve spool via a position sensor

Integrated electronic controller (OBE)

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R900501001 4WS2EM10-4X/10B2ET315K8BM-52 The company mainly deals with European and American brands and can source brands from any European country. For example, our key German brands include: BURKERT, DEMAG, HAWE, REXROTH, HYDAC, PILZ relays, FESTO, IFM sensors, E+H, HEIDENHAIN, P+F sensors, SICK, TURCK, and HIRSCHMANN industrial switches. German brands: Hengstler, Murr, Schmersal, Samson, EPRO (Emerson Group)

American brands: MOOG, ASCO, MAC, NUMATICS, PARKER, VICKERS, ROSS

British brands: Norgren

Italian brands: OMAL, ATOS, CAMOZZI, UNIVER, Camozzi