I. Model Breakdown

4WEH: 4-way, wet-type electromagnet, electro-hydraulic directional valve (WEH)

22: Nominal diameter DN22 (NG22), installation surface ISO 4401-10

J: Valve core function J-type (4/3 neutral position)

Neutral position: P→T unload; A, B closed

7X: Structural version 7X (70 series)

6EW110: AC110V wet-type electromagnet (6E = AC, W = wet type, 110 = 110V)

N9: Concealed manual emergency button, protection IP65

ET: Terminal position electrical feedback (position switch)

S2: Throttle hole Ø1.0 mm (controls switching speed)

K4: DIN43650 standard three-core plug

II. Core Technical Parameters

Structure: Three-way four-port, electro-hydraulic pilot control, dual electromagnets, both ends spring alignment

Maximum working pressure: 350 bar (35 MPa)

Maximum flow rate: ≈ 500 L/min (Δp = 5 bar)

Control pressure (pilot): 80–210 bar

Working medium: Mineral hydraulic oil HL, HLP

Oil temperature range: -20℃ ～ +80℃

Environmental temperature: -20℃ ～ +50℃

Sealing material: NBR (nitrile rubber)

Weight: Approximately 14 kg

III. Valve Core Function (J-type 4/3)

Neutral position (both electromagnets off): P→T open (pump unload); A, B closed (actuator locked)

Left position (left electromagnet on): P→A open; B→T open

Right position (right electromagnet on): P→B open; A→T open

IV. Key Features

Electro-hydraulic pilot control: suitable for high-flow, high-pressure systems

Position feedback (ET): can be connected to PLC, monitoring valve core position

Throttle hole (S2): reduces impact, smooth switching

AC 110V coil: suitable for North America / some Asian power grids

V. Typical Applications

Large hydraulic stations, metallurgy, mining, ships

Injection molding machines, die-casting machines, large machine tools

Control of double-acting cylinder with large flow + neutral unload + actuator locking

VI. Domestic Replacement (Hua De)

Model: 4WEH22J7X/6EW110N9ETS2K4

Installation dimensions, function, parameters fully interchangeable