Bosch Rexroth | SL20PB1-4XV
SL20PB1-4X/V
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The SL20PB1-4X/V valve belongs to the Hy-Check Valves series from Bosch Rexroth and is used to block or permit hydraulic flow in automated systems. It mounts on a subplate and matches the ISO 5781-08-10-0-16 porting pattern for straightforward manifold installation. Nominal size 20 (NG20) defines its passage dimensions, while a cracking pressure of 2.5 bar determines the point at which the poppet opens. Because pre-opening is not provided, the poppet stays shut until that threshold is reached. Control area A1 is 3.46 cm², and control area A2 is 0.70 cm², values that dictate the pilot force required to shift the seat. The valve must operate with oil cleanliness no worse than ISO 4406 20/18/15 to maintain service life.
Pilot actuation uses port X, which has a volume of 10.8 cm³, and return oil exits through port Y, which holds 9.6 cm³ and is routed externally. Control area A3 measures 10.17 cm² and control area A4 measures 1.13 cm², giving balanced forces during reverse flow. The assembly tolerates operating pressures up to 315 bar, supporting high-pressure industrial circuits. FKM sealing, identified by the V code, provides chemical and temperature resistance compatible with common hydraulic fluids. A total weight of 4.7 kg simplifies handling during installation or maintenance.
Technical Specifications
Cleanliness Class
ISO 4406 20/18/15
Control Area A1
3.46 cm2
Control Area A2
0.70 cm2
Control Area A3
10.17 cm2
Control Area A4
1.13 cm2
Cracking Pressure
2.5 bar
Max Operating Pressure
315 bar
Mounting Type
Subplate Mounting
Nominal Size
20 (NG20)
Pilot Oil Return
External (Port Y)
Pilot Volume (port X)
10.8 cm3
Pilot Volume (port Y)
9.6 cm3
Porting Pattern
ISO 5781-08-10-0-16
Pre-opening
None
Seal Material
FKM (V)
Weight
4.7 kg
1620 Old Apex Road
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