The 4/2- and 4/3-way proportional directional valves are designed as direct operated components for subplate mounting. They are actuated by means of proportional solenoids with central thread and removable coil. The solenoids are controlled either by external control electronics (type WRA) or by integrated control electronics (type WRAE). The performance of 4WRA 10 EA60-2X can match Rexroth due to two long-terms cooperation.
| Hydraulic | |||
| Valve type | HD-WRA | HD-WRAE | |
| Operating pressure (MPa) | Port A,P,B | 31.5 | 31.5 |
| Ports T | 21 | 21 | |
| Nominal flow qv nom at △ P=1MPa | NS6 (L/min) | 7、15 and 26 | |
| NS10(L/min) | 30 and 60 | ||
| Degree of contamination (μ m) | ≤20 | ||
| Hysteresis(%) | ≤5 | ||
| Reversal error (%) | ≤1 | ||
| Response sensitivity(%) | ≤0.5 | ||
| Pressure fluid | Mineral oil or Phosphate ester | ||
| Viscosity range | 20~380 | ||
| Ambient temperature range (℃) | -20 to +80 | -20 to +50 | |
| Weight (kg) | NS6 | 2 | 2.2 |
| NS10 | 6.6 | 6.8 | |
| Electrical | |||
| Electrical,solenoid | |||
| Valve type | HD-WRA | HD-WRAE | |
| Voltage type | DC | ||
| Voltage controlled (V) | ±10 | ||
| Max.current per solenoid(A) | 2.5 | ||
| Solenoid coil resistance (Ω) | Cold value at 20 ℃ | 2 | |
| Max. warm value | 3 | ||
| Duty | 100% | ||
| Coil temperature (℃) | up to +150 | ||
| Valve protection to DIN40050 | IP65 | ||
| Electrical, control electronics | |||
| control electronics | HD-VT-VSPA2-1-1X/ | integrated in the valve | |
| Supply voltage | Nominal voltage VDC | 24 | |
| Lower limiting value V | 21/22 | 19 | |
| Upper limiting value V | 35 | ||
| Power consumption of the amplifier | I max A | 1.8 | |
| Max. power impulse current A | 3 | ||
Features:
▶ For subplate mounting
▶Direct actuated proportional valve for controlling the direction and volume of a flow
▶ Spring centred control spool
▶ Integrated control electronics, interface A1 or F1 for type 4WRAE
▶ Actuation by means of proportional solenoids with central thread and removable coil
▶ Control electronics for type 4WRA
Application:
The 4WRA 10 EA60-2X proportional directional valve is used to control the flow and direction of hydraulic fluid.
The 4WRA 10 EA60-2X proportional valves basically consist of: Housing (1) with mounting surface Control spool (2) with compression springs (3 ),Solenoids (4) with central thread,Optional integrated valve electronics (5).
HD-4WRA(E).2X/.
With the solenoids (4) de-energised, the control spool (2) is held in the central position by compression springs (3).
Direct actuation of the control spool (2) by energising a proportional solenoid.E.g. controlling of solenoid "b" (4). The control spool (2) is moved to the left in proportion to the electrical input signal.Connection form P to A and B to T via orifice-like cross sections with progressive flow characteristics. De-energisation of the solenoid (4).The control spool(2) is returned to the central position by compression spring (3).
Structure of Proportional Directional Valve 4WRA -2X
HD-4WRA(E)...A-2X
In principle, the function of this valve version corresponds to that of the valve with 3 spool positions. However, the valves with 2 spool positions are only fitted with solenoid "a". Instead of the 2nd proportional solenoid a plug (5) is fitted for NS 6 or for NS 10 a cover(5).
Note for type 4WRA 6..-2X/...
Draining of the tank line is to be avoided. With the appropriate installation conditions, a back pressure valve is to be installed (back pressure approx.0.2MPa).
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