Bosch Rexroth | SL20PB2-4X
SL20PB2-4X/
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The SL20PB2-4X/ valve belongs to the Hy-Check Valves series from Bosch Rexroth and serves as a pilot-operated check component in hydraulic automation circuits where load holding is required. It mounts on a subplate that follows porting pattern ISO 5781-08-10-0-16, and its 4.7 kg mass supports straightforward manifold handling. The unit opens once system pressure reaches its 5.0 bar cracking level and lacks a pre-opening feature, so it stays closed until a pilot signal arrives. A minimum pilot pressure of 5 bar applied to port X moves 10.8 cm³ of oil, while the pilot oil is returned externally to keep the main line free of contaminants.
The SL20PB2-4X/ operates with main and pilot lines rated up to 315 bar, allowing consistent pressure limits across the assembly. It accepts hydraulic fluids between 2.8 mm²/s and 500 mm²/s, and continues to work at ambient temperatures up to 80 °C. Clean operation depends on maintaining fluid quality at ISO 4406 20/18/15, helping to preserve internal sealing surfaces. Port Y requires 9.6 cm³ of pilot volume when used in a return-line configuration, supporting dual-pilot layouts. The design carries a mean time to dangerous failure of 150 years, highlighting long-term reliability in stationary industrial machinery.
Technical Specifications
Ambient Temperature Max
+80 °C
Cleanliness Class
ISO 4406 20/18/15
Connection Type
Subplate Mounting
Cracking Pressure
5.0 bar
Maximum Operating Pressure
315 bar
Maximum Pilot Pressure
315 bar
Minimum Pilot Pressure
5 bar
Mttfd
150 years
Pilot Oil Return
External
Pilot Volume (port X)
10.8 cm3
Pilot Volume (port Y)
9.6 cm3
Porting Pattern
ISO 5781-08-10-0-16
Pre-opening
Without Pre-Opening
Viscosity Maximum
500 mm2/s
Viscosity Minimum
2.8 mm2/s
Weight (subplate Mounting)
4.7 kg
1620 Old Apex Road
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