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The H-4WEH25FA6X/6EW110N9TS2DK23L/B10V directional spool valve belongs to the WEH Directional Spool Valves series and is produced by Bosch Rexroth. It directs flow in hydraulic automation by shifting a 4-way spool sized NG25 with an electro-hydraulic pilot stage. External pilot oil supply keeps the control oil separate from the main circuit, while internal pilot oil return channels it back through port Y. An integrated coil rated for 110 VAC at 50/60 Hz energizes the pilot, and a concealed N9 manual override permits mechanical actuation during service. The S2 discharge control feature allows switching time adjustment so users can tailor the response to machine requirements.
The valve tolerates 350 bar on ports P, A, and B, with the pilot stage operating up to 250 bar and requiring at least 13 bar to shift; the pilot return path can handle 160 bar. A 1.0 mm throttle insert in the pilot line dampens flow surges during spool movement. Hydraulic fluid cleanliness must meet ISO 4406 class 20/18/15 to preserve internal clearances, contributing to a mean time to dangerous failure of 100 years. These pressure limits, flow controls, and reliability figures define its performance envelope in automated hydraulic systems.
Actuation Type
Electro-Hydraulic
Cleanliness Class (iso 4406 (c))
20/18/15
Coil Voltage
110 VAC 50/60 Hz
Manual Override
Concealed (N9)
Max Operating Pressure (p, A, B)
350 bar
Max Pilot Pressure
250 bar
Max Pilot Return Pressure (y Int, Ac)
160 bar
Min Pilot Pressure
13 bar
Mttfd
100 Years
Pilot Oil Return
Internal (Y)
Pilot Oil Supply
External (X)
Size
NG25
Switching Time Adjustment
Discharge Control (S2)
Throttle Insert
Ø 1.0 mm (B10)
Valve Way Configuration
4-Way
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