Bosch Rexroth | 4WEH16E7X6EW110N9TDAL
4WEH16E7X/6EW110N9TDAL
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The 4WEH16E7X/6EW110N9TDAL directional spool valve is manufactured by Bosch Rexroth for the WEH Directional Spool Valves series. It directs hydraulic flow in automation circuits by shifting a NG16 spool across three spring-centered positions to change connection paths. The valve uses an external pilot supply with an internal return through port T, so supplementary pilot lines are minimized. A concealed manual override allows local actuation during commissioning or maintenance without exposing the mechanism to contamination. Proper function requires a minimum pilot pressure of 14 bar to move the spring-centered spool. The interface follows the ISO 4401-07-07-0-05 porting pattern, which aligns with standard subplates in industrial manifolds. Fluid cleanliness must meet ISO 4406 class 20/18/15 to prevent accelerated wear of the metering edges. With both solenoids installed the assembly weighs 8.9 kg, allowing straightforward mounting on modular plates.
For dynamic duties the valve passes up to 300 l/min through symbol E passages. A pilot flow of 35 l/min is enough to achieve the shortest switching time. Pressure in the supply and working ports p, a, and b can reach 280 bar. The tank port withstands 250 bar, and the pilot return paths y and Ac handle 160 bar. The pilot stage itself may be charged to a maximum of 250 bar without affecting reliability. Threaded fasteners must be tightened to 58 Nm to maintain the sealing integrity of the ISO mounting interface. The valve’s mean time to dangerous failure is 100 years, indicating a long operational life under standard duty cycles. These flow, pressure, and reliability values confirm suitability for high-pressure hydraulic automation where precise control and endurance are required.
Technical Specifications
Cleanliness Class
ISO 4406 20/18/15
Manual Override
Concealed
Max Flow (symbol E)
300 l/min
Max Operating Pressure (p,a,b)
280 bar
Max Pilot Return Pressure (y, Ac)
160 bar
Max Tank Port Pressure (t)
250 bar
Maximum Pilot Pressure
250 bar
Minimum Pilot Pressure (spring-centered)
14 bar
Mttfd
100 years
Pilot Flow (shortest Switching Time)
35 l/min
Pilot Oil
External Supply, Internal Return (T)
Porting Pattern
ISO 4401-07-07-0-05
Screw Tightening Torque
58 Nm
Size
NG16
Spool Positions
3 (Spring-Centered)
Weight (two Solenoids)
8.9 kg
1620 Old Apex Road
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