Bosch Rexroth | 4WEH16HD7XOF6EG12N9ETK4
4WEH16HD7X/OF6EG12N9ETK4
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The 4WEH16HD7X/OF6EG12N9ETK4 valve belongs to the WEH Directional Spool Valves series manufactured by Bosch Rexroth for controlling actuator movement in hydraulic automation. With a nominal size of NG16, it suits medium-capacity lines while keeping port geometry consistent across installations. The ISO 4401-07-07-0-05 mounting interface permits direct mounting on standardized subplates. Pilot oil is supplied internally from port P, and it is returned internally to port T, eliminating external pilot hoses. The spool shifts reliably once pilot pressure reaches the 14 bar minimum and can tolerate up to 250 bar during operation. Each actuation consumes 11.45 cm³ of pilot oil, a value useful when sizing the pilot circuit. Two hydraulic end positions provide distinct flow paths, and hydraulic pressure, not a spring, returns the spool to its neutral location, ensuring consistent response under varying temperatures.
Main flow paths withstand 280 bar at ports P, A, and B, while port T is rated for 250 bar to protect the return line. When fully shifted the valve passes up to 300 l/min, making it capable of feeding large cylinders without excessive pressure loss. The recommended working fluid is mineral oil that meets DIN 51524, and system cleanliness must be held at ISO 4406 class 20/18/15 to preserve spool accuracy. A concealed N9 manual override lets maintenance staff move the spool during testing without exposing internal parts. The design achieves an MTTFd of 100 years, indicating a very low likelihood of dangerous failure throughout its service life. These characteristics give the valve sufficient capacity, safety margin, and maintenance features for continuous-duty machines such as presses and molding equipment.
Technical Specifications
Cleanliness Class
ISO 4406 20/18/15
Hydraulic Fluid
Mineral Oil (DIN 51524)
Manual Override
Concealed (N9)
Max Flow (hydraulic End Pos.)
300 l/min
Max Operating Pressure (p,a,b)
280 bar
Max Pilot Pressure
250 bar
Max Pressure At Port T
250 bar
Min Pilot Pressure
14 bar
Mounting Interface
ISO 4401-07-07-0-05
Mttfd (type Weh)
100 years
Nominal Size
NG16
Pilot Return
Internal To T (T)
Pilot Supply
Internal From P (E)
Pilot Volume Per Switch
11.45 cm3
Spool Positions
2 (Hydraulic End Position)
Spool Return
Hydraulic
1620 Old Apex Road
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