Bosch Rexroth | 4WN10D3XOF12-SO43A-1825
4WN10D3X/OF/12 SO43A-1825
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The 4WN10D3X/OF/12 SO43A-1825 is produced by Bosch Rexroth and belongs to the WP Pneumatic Spool Valves series. It directs pressure and return flow in hydraulic automation circuits where remote pilot control is required. The valve matches the ISO 4401-05-04-0-05 porting pattern so it can be installed on commonly used sub-plates without adapter blocks. A maximum operating pressure of 350 bar allows the component to handle high-pressure supply lines found in industrial power units. Its rated flow of 160 l/min supports rapid cylinder or motor movement when full stroke speed is needed. The unit can be mounted in any position, which eases layout inside compact manifolds. Hydraulic cleanliness must reach ISO 4406 20/18/15 to protect the spool and sealing edges from abrasive wear. Ambient temperatures may range from −20 °C up to 70 °C, enabling service in unheated or warm machine rooms, while service fluid temperatures are permitted up to 80 °C so heat generated during continuous duty does not jeopardize seal life.
Viscosity limits span from 2.8 mm²/s to 500 mm²/s, allowing the valve to work with thin startup oils and thicker fluids encountered at low temperatures without sticking. Pilot control is constrained between 1.5 bar and 10 bar; the lower figure guarantees reliable shifting, and the upper figure prevents overload of the control pistons. A back-pressure rating of 210 bar on the tank port ensures that return lines or counterbalance circuits do not impair function. The internal pilot chamber volume of 23.7 cm³ defines the amount of oil that must be supplied during each actuation and influences response time. Connection of this pilot line is made through a 7/16-20 UNF thread, which matches standard hydraulic fittings for easy hose routing. Mean time to dangerous failure is calculated at 150 years, giving designers a large safety margin for machine risk assessments and functional safety evaluations.
Technical Specifications
Cleanliness Class
ISO 4406 (c) 20/18/15
Installation Position
Any
Maximum Ambient Temperature (nbr)
70 C
Maximum Flow
160 l/min
Maximum Fluid Temperature (nbr)
80 C
Maximum Operating Pressure (a/b/p)
350 bar
Maximum Pilot Pressure
10 bar
Maximum Tank Port Pressure (t)
210 bar
Maximum Viscosity
500 mm2/s
Minimum Ambient Temperature (nbr)
-20 C
Minimum Pilot Pressure
1.5 bar
Minimum Viscosity
2.8 mm2/s
Mttfd
150 Years
Pilot Oil Port Thread
7/16-20 UNF
Pilot Volume
23.7 cm3
Porting Pattern
ISO 4401-05-04-0-05
1620 Old Apex Road
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