Most hydraulic distributors eventually face the same question: the customer's schematic calls for a DSG-01, the machine on the shop floor wears a 4WE6, and the shelf holds a DG4V-3. Are these the same valve? In mounting and function — yes. This guide explains what the interchange actually covers, and the four checks that separate a safe swap from an expensive mistake.
One mounting standard, three order codes
All three valves bolt to the same NG6 subplate — also called CETOP 3 or ISO 4401-03. The bolt pattern, port positions and O-ring layout are fixed by that standard, which is why valves from different manufacturers mount interchangeably without re-drilling the manifold. The family includes the Yuken DSG-01, Bosch Rexroth 4WE6, Vickers DG4V-3, and interchange production from manufacturers like VEYDOR.
The electrical side is just as standardized: a wet-armature solenoid with a DIN 43650 connector, supplied in 12/24 VDC and 110/220 VAC. Rated performance for the class is 315 bar (31.5 MPa) maximum pressure and roughly 63 L/min maximum flow, with small differences between brands on the exact flow limit per spool type.
The spool cross-reference table
The spool code — not the brand — is what defines the valve's behavior. The most common spool functions map one-to-one across the three ordering systems:
| Function | Yuken DSG-01 | Rexroth 4WE6 | Vickers DG4V-3 |
|---|---|---|---|
| 3-position, all ports blocked in center | 3C2 | 4WE6E | DG4V-3-2C |
| 3-position, pump to tank in center | 3C3 | 4WE6H | DG4V-3-0C |
| 3-position, A and B to tank in center | 3C4 | 4WE6J | DG4V-3-6C |
| 3-position, pump to A and B in center | 3C60 | 4WE6G | DG4V-3-8C |
| 2-position, spring offset | 2B2 / 2B3 | 4WE6D / 4WE6C | DG4V-3-2A / 0A |
For the two-position spools, the spring-offset port connection differs between conventions, so always confirm against the circuit symbol in the schematic rather than the code alone.
The four checks before you swap
- Spool symbol. Read the schematic, not the old nameplate. A 3C2 in a circuit designed for 3C60 will block a cylinder instead of moving it.
- Coil voltage. 24 VDC and 110 VAC coils are not interchangeable on the machine. The connector is standard; the voltage is not.
- Flow rating. The mounting interface is identical, but flow limits differ slightly between brands and spool types. At more than 60 L/min, check the datasheet or move to the NG10 size.
- Seals. Subplate O-rings should be renewed at every valve change — the most common cause of a "new valve leaking" is the old seal underneath it.
Buying the interchange
Because the standard fixes the interface, interchange production competes on machining quality and testing, not on compatibility. Our DSG-01 series covers the spool codes above with AC and DC coils, and each valve is pressure- and function-tested individually before packing. If your customer's fleet mixes brands, one supplier can cover the DSG-01, 4WE6 and DG4V-3 positions — send us your spool codes and we quote the full set within 24 hours.