Bosch Rexroth | SL30PB2-4X
SL30PB2-4X/
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The SL30PB2-4X/ pilot-operated check valve is manufactured by Bosch Rexroth within the Hy-Check Valves series for load-holding functions in hydraulic automation. It handles a maximum operating pressure of 315 bar and supports flow rates up to 550 l/min. The nominal size is NG32, and the valve installs on subplates that follow the ISO 5781-09-13-0-16 porting pattern. Flow from port A to port B is unrestricted, while flow from B to A occurs only after the pilot opens the poppet; initial opening begins once 5 bar cracking pressure is reached. With a mass of 7.8 kg, the unit can be mounted directly on system manifolds and used where compact blocking valves are required.
The control piston offers a hydraulic area of 5.72 cm², and the pilot chamber at port X holds 19.27 cm³ of oil for reliable actuation. Pilot oil drains externally to prevent back-pressure interference with closing behavior. The valve is supplied without pre-opening, so reverse flow remains blocked until the full pilot signal is applied. NBR sealing elements contain pressure and temperature within standard mineral-oil circuits, while cleanliness requirements correspond to ISO 4406 class 20/18/15. Calculated mean time to dangerous failure is 150 years, giving a long service interval under typical duty cycles.
Technical Specifications
Cleanliness Class
ISO 4406 20/18/15
Control Area A1
5.72 cm2
Cracking Pressure
5 bar
Flow Direction
A→B Free; B→A When Opened
Max Flow
550 l/min
Max Operating Pressure
315 bar
Mttfd
150 years
Nominal Size
NG32
Pilot Oil Return
External
Pilot Volume Port X
19.27 cm3
Porting Pattern
ISO 5781-09-13-0-16
Pre-opening
Without Pre-Opening
Seal Material
NBR
Type Of Connection
Subplate Mounting
Valve Type
Pilot-Operated Check Valve
Weight (subplate Mounting)
7.8 kg
1620 Old Apex Road
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