Bosch Rexroth | 4WEH22HD7X6EW110N9K4V
4WEH22HD7X/6EW110N9K4/V
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The 4WEH22HD7X/6EW110N9K4/V valve belongs to the WEH Directional Spool Valves series from Bosch Rexroth. It directs hydraulic flow in automation circuits using electro-hydraulic actuation, allowing remote electrical commands to shift the spool. A nominal size of NG25 offers passage dimensions suited to medium-to-high flow plant manifolds, while the D-type spool provides the required overlap characteristics for load holding and meter-out control. The unit sustains operating pressures up to 350 bar at ports P, A, and B, and accommodates flows as high as 450 l/min, so it can manage large cylinder or motor demands without excessive pressure drop. Connection to subplates follows the ISO 4401-08-08-0-05 porting pattern, enabling interchangeability with standard mounting surfaces. Pilot shifting is handled by an attached 4WE6 6E directional valve; this pilot stage moves the main spool once a pilot pressure of at least 8 bar is available and remains within a permissible 210 bar maximum.
Hydraulic pressure returns the control spool to center when pilot energy is removed, eliminating the need for mechanical springs and ensuring consistent neutral positioning. A concealed manual override lets maintenance personnel reposition the valve in case of electrical failure without exposing the mechanism to contaminants. FKM seals resist high-temperature oils and common hydraulic additives, maintaining leak-tight operation. Fluid cleanliness should be maintained at 20/18/15 per ISO 4406 to protect internal lands and bores. The external coating is limited to 100 µm thickness so mounting bolts seat correctly and grounding paths remain intact. Port T tolerates back-pressure up to 250 bar, expanding installation flexibility in circuits with counterbalance valves. The mean time to dangerous failure is rated at 100 years, reflecting a high reliability level for safety-related duties.
Technical Specifications
Actuation
Electro-Hydraulic
Cleanliness Class
20/18/15 (ISO 4406)
Coating Thickness (max)
100 µm
Control Spool Return
Hydraulic
Manual Override
Concealed
Max Flow
450 l/min
Max Operating Pressure (p, A, B)
350 bar
Max Pilot Pressure
210 bar
Max Pressure (port T)
250 bar
Min Pilot Pressure
8 bar
Mttfd Value
100 years
Nominal Size
NG25
Pilot Control Valve
4WE6 6E
Porting Pattern
ISO 4401-08-08-0-05
Seal Material
FKM
Spool Symbol
D
1620 Old Apex Road
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