NG6 Solenoid Directional Valves: The HDC Alternative to Rexroth, Yuken, Parker & Eaton Vickers
If you spec, maintain, or repair hydraulic power packs, you already know the NG6 (CETOP 3, ISO 4401-03) solenoid directional valve by heart, it's one of the most widely used valve sizes in industrial and mobile hydraulics, and it's usually sold under one of a handful of legacy brand names at a legacy brand price.
At Hydrodynamics, we supply the HDC WE6 series, a size-for-size, port-for-port NG6 4/3 and 4/2 solenoid directional valve built to the same ISO 4401-03 mounting standard, at a fraction of the OEM sticker price. If you've been searching for any of the part families below, here's what you need to know before you buy.
Which legacy part number are you replacing?
The NG6 solenoid directional valve is catalogued under different naming conventions depending on the brand. If your drawing, spare parts list, or old valve nameplate references any of the following, our HDC WE6...6XJ is the equivalent valve size and function to look at:
Brand | Typical NG6 Reference | Mounting / Function |
Rexroth | 4WE6 series | ISO 4401-03 / CETOP 3, 4/2 & 4/3 solenoid directional |
Yuken | DSG series | ISO 4401-03 / CETOP 3, 4/2 & 4/3 solenoid directional |
Parker | D1VW / D3W / D81 series | ISO 4401-03 / CETOP 3, 4/2 & 4/3 solenoid directional |
Eaton Vickers | DG4V-3 / DG4V-5 series | ISO 4401-03 / CETOP 3, 4/2 & 4/3 solenoid directional |
HDC (Hydrodynamics) | WE6...6XJ | ISO 4401-03 / CETOP 3, 4/2 & 4/3 solenoid directional |
These are all valves built to the same CETOP 3 / ISO 4401-03 mounting pattern and pressure/flow class, which is precisely why an NG6 valve cavity in the field can usually accept a replacement from any of these families without re-machining the manifold.
An important word on "equivalent"
We'd rather earn your business with accurate information than a quick sale. "Equivalent" here means same industry-standard mounting interface, port layout, and pressure/flow class, it does not mean identical internal design, spool geometry, or a drop-in guarantee across every configuration and voltage. Before you order a replacement for an existing installation, always confirm:
Porting pattern and spool type (open/closed centre, number of positions)
Coil voltage and connector type
Pressure and flow rating for your circuit
Cavity/mounting bolt pattern on your manifold
Our team is happy to check this against your existing valve or drawing before you commit, that's a five-minute phone call or email that can save you a return shipment.
Why buy the HDC NG6 valve instead of the legacy brand
Same mounting standard, held in stock locally — no waiting weeks on an OEM back-order for a standard CETOP 3 valve.
Meaningfully lower landed cost than Rexroth, Yuken, Parker, or Eaton Vickers equivalents, without dropping below industrial duty-cycle specification.
Direct technical support — we'll help you cross-check spool type, voltage, and cavity before you order, not after.
Built for the same applications: power packs, presses, mobile hydraulics, and general industrial circuits running standard NG6/CETOP 3 architecture.
Common applications for the NG6 / WE6 solenoid directional valve
Hydraulic power units and standalone power packs
Injection moulding and press circuits
Mobile and agricultural hydraulic systems
General industrial machine tool hydraulics
Retrofit and maintenance replacement on existing CETOP 3 manifolds
Get a quote or a technical cross-check
Replacing a Rexroth 4WE6, Yuken DSG, Parker D1VW/D3W/D81, or Eaton Vickers DG4V-3/DG4V-5? Send us your existing valve's nameplate details (or a photo of it) and we'll confirm the correct HDC WE6 configuration for your machine, spool type, voltage, and seals included.
Get in touch with Hydrodynamics: www.hydrodynamics.co.za
Rexroth, Yuken, Parker, and Eaton Vickers, and the model designations referenced above (4WE6, DSG, D1VW, D3W, D81, DG4V-3, DG4V-5), are trademarks of their respective owners and are used here for cross-reference and compatibility purposes only. Hydrodynamics is an independent supplier of HDC hydraulic valves and is not an authorised distributor of, endorsed by, or affiliated with Rexroth, Yuken, Parker, or Eaton Vickers. Always verify exact configuration, porting, and cavity dimensions before specifying a replacement valve.
