4/3 high-response directional valves, pilot operated, with electrical position feedback and integrated electronics (OBE) 4WRLE

Бренды

Size 10, 16, 25, 27, 35
Component series 4X
Maximum operating pressure 350 bar
Maximum flow 4700 l/min

Reliable - proven and robust design
High quality – control spool and sleeve of the pilot control valve in servo quality
The control spool of the pilot control valve is in the “fail-safe” position when the unit is switched off
The control spool of the main valve is in the spring-centered central position and/or in the offset position
Flexible - suitable for position, velocity and pressure control
Precise - high response sensitivity and little hysteresis

Type		4WRLE
Size		10	16	25	27	35
Component series		4X
Installation position		Any
Earth	kg	9	12	19	21	80
Ambient temperature range	°C	-20 … +60
Sine test according to DIN EN 60068-2-6		10...2000...10 Hz / maximum 10 g / 10 cycles / 3 axes
Random test according to DIN EN 60068-2-64		20...2000 Hz / 10 gRMS / 30 g peak / 30 min / 3 axes
Shock test according to DIN EN 60068-2-27		15 g / 11 ms / 3 axes
Maximum relative humidity 1)	%	95
Maximum surface temperature 2)	°C	120
MTTFd values according to EN ISO 13849	yrs	75

Symbol E and W

The valve type 4WRLE is a pilot-operated directional control valve with electrical position feedback and integrated electronics (OBE).

Set-up

The valve basically consists of 3 main assemblies:

Pilot control valve (1) with control spool and sleeve, return spring, control solenoid and inductive position transducer

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Main valves (2) with centering springs and position feedback

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Integrated control electronics (OBE) (3)

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Function

When the integrated control electronics (OBE) is switched off or inactive, the control spool of the pilot control valve is spring-operated in the “fail-safe" position. The control spool of the main valve is its spring-centered central position.

The integrated control electronics (OBE) compares the specified command value to the position actual value of the main valve control spool. In case of control deviations, the control solenoid will be activated. Due to the changed magnetic force, the pilot control spool is adjusted against the corresponding spring. The flow which is activated via the control cross-sections leads to an adjustment of the main control spool. The stroke/control cross-section of the main control spool is regulated proportionally to the command value.

The pilot oil supply in the pilot control valve is either internal via port P or external via port X. The feedback can be internal via port T or external via port Y to the tank.

Failure of supply voltage

If the supply voltage fails or in case of cable break, the integrated electronics will de-energize the control solenoid, the pilot control spool will move to the fail-safe position and will unload the pilot oil chambers of the main valve. Operated by the spring, the main valve control spool will move to the central position.

Notice:

Pilot-operated 4/3-directional control valves with positive overlap are functional in controlled or regulated axes. The overlap in the de-energized state is approx. 20% of the control spool stroke. While the electrical supply voltage is switching off, the drive may be accelerated for a short time in functional direction P to B.

Symbol V and V1-