Bosch Rexroth | 4WEH22HD7X6EW110N9DA
4WEH22HD7X/6EW110N9DA
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The 4WEH22HD7X/6EW110N9DA directional spool valve belongs to the WEH Directional Spool Valves series from Bosch Rexroth and is used to route pressure and return lines in automated hydraulic machinery. Its nominal size of NG25 provides a flow cross-section suitable for medium to large actuators, while the four available ways establish separate pressure, tank, and work ports. Two discrete spool positions let a controller shift between defined flow paths, and the HD spool symbol identifies the metering contours that set pressure drop and response behavior. A maximum flow capacity of 450 l/min supports rapid cylinder movement in high-demand circuits. The unit follows the ISO 4401-08-08-0-05 mounting pattern so it can bolt directly to standardized subplates, and it must be installed horizontally to keep the spool centered and ensure proper pilot drainage. System oil must be filtered to ISO 4406 20/18/15 to protect internal lands from abrasion and sticking.
Pilot actuation is handled by a separate 4WE 6E valve that sends control oil to the end faces of the main spool. Achieving the shortest switching time requires a pilot flow of 35 l/min, and the pilot supply may reach 210 bar without damaging the control stage. Reliable shifting still demands a minimum pilot pressure of 8 bar so spring forces and friction are overcome. The pilot return in port y can tolerate up to 160 bar, which allows the valve to operate in circuits with elevated back-pressure on the drain line. A concealed manual override designated N9 is integrated for local testing or emergency operation without exposing the operator to pressurized oil.
Technical Specifications
Cleanliness Class
ISO 4406 20/18/15
Installation Position
Horizontal Required
Manual Override
Concealed (N9)
Max Pilot Return Pressure (y, Ac)
160 bar
Maximum Flow
450 l/min
Maximum Pilot Pressure
210 bar
Min Pilot Pressure (hyd. End)
8 bar
Mounting Pattern
ISO 4401-08-08-0-05
Nominal Size
NG25
Pilot Control Valve
4WE 6E
Pilot Flow (shortest Switching)
35 l/min
Spool Positions
2
Spool Symbol
HD
Ways
4
1620 Old Apex Road
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