Huade directional, pressure and flow proportional valves from Cetop 3 to Cetop 8, with electronic drivers.
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Proportional valves continuously regulate the direction, pressure and flow of hydraulic fluid in proportion to the electrical command signal, enabling precise control at every stage of the production cycle.
The range covers sizes from Cetop 3 to Cetop 8, with direct-acting solutions and two-stage pilot-operated versions, complemented by dedicated electronic drivers.
The range includes Huade-branded series.
From direct control on compact sizes to pilot-operated versions for high flow rates, the range covers any directional and flow modulation requirement, with open and closed loop configurations up to Cetop 8.
Pressure relief and reducing valves with proportional solenoid, available with external electronics or integrated directly into the valve body to reduce hysteresis and characteristic curve scatter in the most demanding duty cycles.
2-way solutions with integrated pressure and temperature compensator to maintain stable flow regardless of load variations, with automatic orifice closure upon signal interruption.
Compact amplifiers for proportional solenoid management, with on-device parameterisation of current, ramps and dither, and compatibility with the main signal formats and industrial protocols.
Proportional valves guide
A proportional valve regulates direction, flow or pressure continuously and in proportion to an electrical command signal, instead of switching between fixed positions like an on/off valve. It is used where a machine needs smooth movements, controlled ramps and repeatable pressures: presses, injection moulding machines, test benches, lifting and handling systems.
The Hydraut range covers Huade proportional valves from Cetop 3 to Cetop 8 (NG6 to NG32), in open and closed loop, plus the electronic drivers that control them.
| Series | Function | Size (NG) | Max flow (l/min) | Max pressure (bar) | Control loop | Rexroth reference series |
|---|---|---|---|---|---|---|
| HD-4WRA(E) | Directional, direct-acting | 6, 10 | 95 | 315 | Open (4WRA) / closed (4WRAE) | 4WRA(E) |
| HD-4WRE(E) | Directional, direct-acting with LVDT | 6, 10 | 260 | 315 | Closed | 4WRE(E) |
| HD-4WRZ(E) | Directional, two-stage pilot-operated | 10, 16, 25, 32 | 1,600 | 315–350 | Open | 4WRZ(E), 4WRH |
| HD-(Z)DBE(E) | Pilot-operated pressure relief | 6 | 30 | 315 | With or without OBE electronics | (Z)DBE(E) |
| HD-2FRE | 2-way pressure-compensated flow | 6, 10, 16 | 160 | 210 | Closed loop on the orifice | 2FRE |
| HD-US-DAS2 | Two-channel electronic driver | — | 2 × 3 A | — | Open | — |
Huade has built hydraulic valves under Rexroth technology licence since 1981. That is why its series follow the same designations as the Rexroth reference series (4WRA, 4WRE, 4WRZ, DBE, 2FRE) and use the standard ISO 4401 mounting interfaces: the valve fits the subplate or manifold you already use.
With Hydraut you add what an importer alone cannot offer:
Directional valves (4WRA, 4WRE, 4WRZ) control both the direction and the speed of the actuator. Pressure valves (DBE) set the system pressure, for example the clamping force of a press. Flow valves (2FRE) keep the actuator speed constant regardless of the load.
In open loop the valve follows the command signal without measuring the spool position: simpler and cheaper, suitable for most industrial movements. In closed loop an LVDT transducer measures the spool position and the electronics correct it continuously: higher precision and repeatability, lower hysteresis, for positioning and fast cycles (4WRAE, 4WRE(E)).
Choose the size from the flow you need: direct-acting valves cover NG6 and NG10, two-stage pilot-operated valves (HD-4WRZ) handle up to 1,600 l/min in NG32.
Valves with integrated OBE electronics receive the command signal directly and reduce wiring in the cabinet. Valves with external electronics need a driver such as the HD-US-DAS2, which accepts ±10 V, 0–10 V and 4–20 mA signals and drives two solenoids up to 3 A each.
All series work with mineral oil (NBR seals); phosphate ester fluids require FPM seals.
Send us the code of the valve you use today
Our technical team returns the equivalent Huade code and checks size, spool and electronics with you.
The Huade HD-4WRE(E) series: direct-acting proportional directional valves with LVDT, closed loop, in sizes 6 and 10, with external electronics (4WRE) or integrated OBE electronics (4WREE). Send us your Rexroth code and we confirm the matching Huade code.
An open loop valve follows the command signal without measuring the spool position. A closed loop valve measures the spool position with a transducer and corrects it continuously, giving higher precision, lower hysteresis and better repeatability.
OBE stands for on-board electronics: the amplifier is integrated in the valve body, so the valve receives the command signal directly without a separate driver in the electrical cabinet.
±10 V, 0–5 V, 0–10 V and 4–20 mA, with a supply voltage of 8–32 VDC. It drives two independent solenoids up to 3 A each, with separate rise and fall ramps.
Every Huade valve is tested at source. When we assemble, configure or repair a proportional valve in our Italian facility, our test bench also checks hysteresis and response curve, and we can provide the test certificates.
Standard delivery is 2 weeks from order confirmation; stock items ship in 24–48 hours. Huade valves have a 24-month warranty.
Rexroth, Voith and the series names mentioned are trademarks of their respective owners and are used only to indicate compatibility. Hydraut Europe S.r.l. is not affiliated with these companies.
