I. Model Breakdown

4WEH: 4 ports, wet-type electromagnet, electro-hydraulic directional valve (WEH = pilot type)

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

K4: DIN43650 standard three-core plug

Compared with your previous model 4WEH22J-7X/6EW110N9ETS2K4:

Without ET (position feedback) and S2 (bypass hole), the basic function and appearance are the same.

II. Core Technical Parameters

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

Maximum working pressure (P/A/B): 350 bar

Maximum pressure at return oil port T: 210 bar

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 ports 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. Typical Applications

Large hydraulic stations, metallurgy, mining, ships

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

Double-acting cylinder control with high flow rate + neutral position unload + actuator locking

V. Domestic Replacement (Hua De)

Model: 4WEH22J7X/6EW110N9K4

Installation dimensions, function, parameters fully interchangeable