Bosch Rexroth | SL52PA1-1X
SL52PA1-1X/
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The SL52PA1-1X/ is a pilot-operated check valve built by Bosch Rexroth in the Hy-Check Valves series for load-holding tasks in hydraulic automation. Subplate mounting streamlines service, and the porting pattern matches ISO 5781 so manifolds do not need custom drilling. Nominal size 52 supports high flow, while the flow path is free from A to B and released from B to A by a pilot signal, allowing controlled reversal under load. Cracking-pressure version 1 sets the pressure at which the poppet lifts, and a pre-opening feature softens pressure spikes during that transition.
The unit withstands operating pressures up to 315 bar, enabling use in heavy-duty circuits. External pilot oil return vents the pilot chamber directly to tank, helping the poppet reseat quickly. The valve may be installed in any orientation, which aids tight packaging inside machinery. NBR seals are supplied for compatibility with standard mineral hydraulic fluids, and the total mass is 29.8 kg, a factor when designing mounting plates and handling procedures.
Technical Specifications
Connection Type
Subplate Mounting
Cracking-pressure Version
1
Direction Of Flow
A→B Free; B→A Via Pilot
Installation Position
Any
Max Operating Pressure
315 bar
Nominal Size
52
Pilot Oil Return
External
Porting Standard
ISO 5781 (Connection Location)
Pre-opening
Yes
Seal Material
NBR (No Suffix)
Valve Type
Pilot-Operated Check Valve (Seat)
Weight
29.8 kg
1620 Old Apex Road
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