Bosch Rexroth | SL20PA3-4X
SL20PA3-4X/
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The SL20PA3-4X/ valve is produced by Bosch Rexroth for the Hy-Check Valves series and is applied to block reverse flow in hydraulic manifolds while permitting pilot-controlled release. It is built for a nominal size 20 (NG20) interface and uses subplate mounting to simplify service in modular stacks. The porting pattern matches ISO 5781-08-10-0-16 so cavity machining remains consistent across equipment. A pre-opening design limits pressure shock at startup, and the poppet lifts when the cracking pressure reaches 7.5 bar. Continuous duty is supported up to 315 bar of system pressure. Control area A1 equals 3.46 cm² and control area A2 equals 0.70 cm²; these surfaces determine the hydraulic force necessary to shift the poppet during pilot operation.
Control area A3 measures 10.17 cm² and control area A4 measures 1.13 cm², creating additional differential force for secure closure when flow attempts to reverse. Pilot oil is routed back to tank externally so internal passages avoid unintended back pressure. The pilot supply may vary from 5 bar to a maximum of 315 bar, allowing a wide control margin for unlocking commands. Pilot volume at port X is 10.8 cm³, while port Y stores 9.6 cm³, figures used to size control lines for rapid response times. The complete assembly weighs 4.7 kg, a consideration for manifold support brackets and service handling.
Technical Specifications
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
7.5 bar
Max Operating Pressure
315 bar
Nominal Size
20 (NG20)
Pilot Oil Return
External
Pilot Pressure Max
315 bar
Pilot Pressure Min
5 bar
Pilot Volume Port X
10.8 cm3
Pilot Volume Port Y
9.6 cm3
Porting Pattern
ISO 5781-08-10-0-16
Pre-opening
With Pre-Opening
Type Of Connection
Subplate Mounting
Weight
4.7 kg
1620 Old Apex Road
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