I. Model Structure (Taking 3DREPE6C-2X/25EG24N9K31/A1V as an example)

3DREPE: Series code (3 = three-way, D = direct action, RE = pressure reduction, P = proportional, E = built-in amplifier)

6: Diameter Size 6 (ISO 4401 installation surface)

C: Valve core type (standard type)

2X: Series version (2x series, currently mainstream)

25: Maximum set pressure 25 bar (optional 10/25/45/70/100 bar)

EG24: Electromagnet 24VDC, wet coil, detachable coil

N9K31: Electrical interface + characteristics (N9 = plug, K31 = standard performance)

A1: Built-in amplifier type (A1 = analog 0–10V/4–20mA)

V: Optional function (V = with emergency manual override)

II. Core Technical Parameters (Size 6 / 2X series)

Structure: Direct action, three-way, spring alignment

Maximum working pressure: 100 bar (at P port)

Maximum flow rate: 15 L/min

Pressure range: 10 / 25 / 45 / 70 / 100 bar (specified in the model)

Power supply: DC 24V (+/- 10%)

Control signal: 0–10V or 4–20mA (for A1 amplifier)

Response time: ≈ 20–40 ms (step)

Repeatability: ≤ ± 0.5% of full scale

Installation: Plate installation (ISO 4401 / CETOP RP121H)

Protection level: IP65 (with plug)

Weight: ≈ 2.8 kg

III. 3DREP vs 3DREPE (Key Differences)

3DREP: No built-in amplifier → Requires an external analog amplifier (e.g. VT-VSPA2-1-2X)

3DREPE: Built-in integrated electronics (OBED) → Directly connected to 24V + control signal, no need for external amplifier, simpler wiring, stronger anti-interference

IV. Functions and Applications

Function: Converts 0–10V/4–20mA electrical lines linearly into proportional pressure output, used for precise pressure control

Typical applications:

Injection molding machine: Locking force, injection pressure closed-loop control

Machine tools: Spindle / feed hydraulic clamping, balance cylinder pressure control

Hydraulic testing bench: Precise pressure source

Automation equipment: Tension control, press fitting force control