Bosch Rexroth | 4WEH22H7X6EW110N9TDA
4WEH22H7X/6EW110N9TDA
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The 4WEH22H7X/6EW110N9TDA valve is manufactured by Bosch Rexroth for the WEH Directional Spool Valves series and is built to route fluid in automated hydraulic systems through electro-hydraulic actuation. Its 4-way configuration provides two service ports and two pressure paths to alternate cylinder movement. The nominal size NG25 (W.H 22) supports high flow rates common in medium-frame machinery. A spool symbol D on side A defines the neutral and shifted flow patterns required by the circuit designer. The control spool is returned hydraulically, so pilot pressure moves the spool back to its rest position without mechanical springs. A 6E pilot control valve governs the pilot stage, allowing precise shifting of the main spool. Pilot oil is supplied externally through port X, preventing load-induced pressure changes from affecting the pilot circuit, while pilot oil is returned internally to port T to simplify plumbing. Subplate mounting lets the valve drop onto an ISO pattern manifold for quick removal and service.
The fluid entering this valve must meet ISO 4406 cleanliness class 20/18/15 so that internal lands and bores remain free from abrasive wear. A concealed manual override, coded N9, permits emergency spool actuation when electrical power is unavailable. The main pressure ports P, A, and B withstand up to 350 bar, giving the unit headroom for high-pressure drives, while the pilot stage is limited to a maximum of 210 bar to protect its smaller passages. Port T tolerates back-pressure up to 250 bar, accommodating restrictive return lines. For two-spool variants, the pilot circuit needs at least 14 bar to ensure consistent shifting. Interface holes follow the ISO 4401-08-08-0-05 porting pattern, allowing interchange with other valves on the same manifold.
Technical Specifications
Actuation Type
Electro-Hydraulic
Cleanliness Class
ISO 4406 20/18/15
Control Spool Return
Hydraulic
Manual Override
Concealed (N9)
Max Operating Pressure (p/a/b)
350 bar
Max Pilot Pressure
210 bar
Max Pressure Port T
250 bar
Min Pilot Pressure (2-spool)
14 bar
Mounting
Subplate
Nominal Size
NG25 (W.H 22)
Pilot Control Valve
6E
Pilot Oil Return
Internal (T)
Pilot Oil Supply
External (X)
Porting Pattern
ISO 4401-08-08-0-05
Spool Symbol
D (Side A)
Way Configuration
4-Way
1620 Old Apex Road
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