DSHG-04 Pilot Operated Valve
Yuken DSHG-04 Compatible

Yuken-pattern directional valves scale across three tiers, and the jump from DSG to DSHG is not just a size increase — it is a change in how the valve is actuated. The DSG-02 is direct-acting: the solenoid physically pushes the main spool. Beyond roughly 60 L/min the spool becomes too large for a practical solenoid to shift, so the DSHG series introduces a pilot stage — a small DSG-01 class solenoid valve whose output pressure moves the main spool hydraulically.

That architecture is what lets the DSHG-04 pass 300 L/min while its solenoids stay the same modest size as those on a small valve. The trade-off is that the pilot circuit needs pressure to work — covered in the pilot configuration section below.

All three tiers share the 21 MPa rating and the same spool-code logic, so an engineer familiar with DSG-02 codes can read DSHG-04 codes without relearning the system.

Using DSHG-04-3C2-DL-T-D24 as the worked example:

Spool function quick guide. The leading digit tells you the number of positions: 3Cxx spools are three-position with a neutral, 2Bxx spools are two-position spring-offset with no neutral. Within the three-position group, 3C2 is the standard four-way arrangement, 3C4 is its reverse, and 3C60 blocks all four ports in neutral to lock the actuator — the Yuken-pattern equivalent of the Rexroth E spool. The 3C10, 3C11, 3C12 and 3C3 codes are further neutral variants; send the code from your existing nameplate and we confirm the exact match.

Every pilot-operated valve shares one requirement that direct valves do not have: pilot pressure must be available at the moment the valve is commanded to switch. The DSG-01 class pilot on a DSHG-04 needs oil under pressure to move the main spool; without it, the solenoid clicks and nothing happens.

With internal pilot supply, that oil is tapped from the main P port. This is the simplest plumbing and works well when the P line stays pressurised throughout the cycle. With external pilot supply, a separate control line feeds the pilot stage — necessary whenever the main circuit can drop to near-zero pressure.

The trap: if the circuit unloads P to tank while the valve is centred, internal pilot pressure collapses at exactly the moment you need it to switch back. Symptoms look like an intermittent electrical fault — the valve works sometimes and not others — but the cause is hydraulic. If your circuit unloads in neutral, specify external pilot supply, or fit a pilot check valve to hold control pressure.

Also note the DSHG-04's T-port rating of 21 MPa, which is higher than the 16 MPa limit on Rexroth-type valves such as the 4WEH16. In circuits with shared return manifolds or counterbalance valves, that extra headroom is a genuine advantage.

YXCHK DSHG-04 valves follow the Yuken mounting pattern at 04 size (NG10, ISO 4401-05), so a like-for-like swap requires matching three things: spool code, coil voltage, and pilot/drain configuration. When those match, the valve bolts onto the existing sub-plate with no machining and no re-piping.

A note on cross-brand substitution. The DSHG-04 shares the ISO 4401-05 sub-plate footprint with Rexroth-type NG10 valves, but the two families differ in pressure class — DSHG-04 is rated 21 MPa while the Rexroth-type 4WE10 is rated 31.5 MPa. If your system relief is set above 21 MPa, a DSHG-04 is not a valid substitute regardless of bolt pattern. Conversely, if you are replacing a Yuken DSHG-04 in a 21 MPa circuit, there is no benefit in paying for a 31.5 MPa valve.

For a full walkthrough of the repair-versus-replace decision and field diagnosis, see our valve replacement guide. For sizing a new circuit from scratch, the directional valve selection guide covers size, spool, voltage and flow verification in sequence.