Huade’s explosion-proof proportional directional valve 4WRA 6-2X are 4/2- and 4/3-way proportional directional valves. They 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 b external control electronics. This 4WRA 6-2X explosion-proof valve has a wide range of applications, mainly in areas where precise control of hydraulic system flow, pressure, speed and other parameters is required.
| Hydraulic | |||
| Installation | Optional, preferably horizontal | ||
| Nominal size | 6 | 10 | |
| Weight (kg) | 4WRA... 2X | 2 | 6.6 |
| Nominal flow Qvnom at △p = 10 bar (L/min) | 7, 15, 26 | 30, 60 | |
| Hysteresis (%) | ≤5 | ||
| Reversal span (%) | ≤1 | ||
| Response sensitivity (%) | ≤ 0.5 | ||
| Max.operating pressure | Ports A,B,P (bar) | 350 | |
| Port T (bar) | 210 | ||
| Pressure fluid | Mineral oil(HL,HLP) to DIN 51524 | ||
| Other pressure fluids on request! | |||
| Ambient air temperature range (℃) | 4WRA...2X | -20°C to 70°C(-4°F to 158°F) | |
| Viscosity range (mm2/s) | 20to 380(preferably 30 to 46) | ||
| Fluid Cleanliness Class | NAS1638 class9 or ISO 4406 class 20/18/15 | ||
| Electrical | ||||
| 1)Solenoid data | ||||
| Voltage type | DC | |||
| Command value signal for 4WRA | ±10Vor4~20mA | |||
| Max.current per solenoid (A) | 2.5 | 1.5 | 0.8 | |
| Solenoid coil resistance (Ω) | Cold value at 20°C | 2 | 4.8 | 19.5 |
| Max.warm value | 3 | 7.2 | 28.8 | |
| Duty (%) | ED100% | |||
| Max.coil temperature (℃) | 150 | |||
| Valve protection to EN60529 | IP 65 | |||
| 2) Control electronics | ||||
| Amplifier | 4WRA...2X | VT-VSPA2-...- 2X | ||
| Supply voltage (V) | Nominal voltage | 24 | ||
| Lower limiting value | 21/22(4WRA) | |||
| Upper limiting value | 35 | |||
| Amplifier power consumption (A) | Imax | <1.8 | ||
| Impulse current | 3 | |||
Features:
▶Direct operated proportional directional valve to control the direction and magnitude of a flow
▶For subplate mounting: Porting pattern conforms to ISO4401
▶Actuation by means of proportional solenoids with central thread and removable coil
▶Spring centred control spool
Application:
Explosion-Proof proportional directional valve 4WRA 6-2X can be used in heavy machinery manufacturing, machine tools, industrial automation.
The valves basically consist of: Body (1) with mounting surface, Control spool (3) with compression springs (2), Solenoids (4) with central thread.
With the solenoids (4), de-energised, the control spool (3) is held in the central position by the compression springs (2 ).
Direct operation of the control spool (3) by energising one of the proportional solenoids(4) e.g. control of solenoid right, then movement of the control spool (3) to the left in proportion to the electrical input signal, and connection from P to A and B to T via orifce-like crosssections with progressive flow characteristics.
4WRA(E)...A-2X the 2 switched position valves are however only fitted with solenoid "a". A plug (6) is fitted in place on the "b" proportional solenoid.
Symbols of Explosion-Proof Proportional Directional Valve 4WRA 6-2X
Address
No. 27, Yangsha Road, Huilong Town, Qidong City, Jiangsu Province, China
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