Бренды
4/3 high-response directional valves, pilot operated, with electrical position feedback and integrated electronics (OBE) 4WRLE
4/3 high-response directional valves, pilot operated, with electrical position feedback and integrated electronics (OBE) 4WRLE
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Size 10, 16, 25, 27, 35
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Component series 4X
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Maximum operating pressure 350 bar
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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:
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.
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:
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 in its spring-centered offset position at approx. 6% of the stroke in direction P to B/A to T.
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. In case of a command value presetting of 0 V, the electronics adjust the control spool of the main valve to central position.
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 offset position (approx. 6% P to B/A to T).
Notice:
Pilot-operated 4/3 directional control valves are only functional in the active control loop and do not have a locking basic position when deactivated. Consequently "external isolator valves" are required in many applications and must be taken into account regarding the switch-on/switch-off order. While the electrical supply voltage is switching off, the drive may be accelerated for a short time in functional direction P to B.
Pilot oil supply
NG10
NG16
NG25
NG27
NG35