Bosch Rexroth | SL15GB4-4XV12
SL15GB4-4X/V/12
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The SL15GB4-4X/V/12 valve is part of the Hy-Check Valves series manufactured by Bosch Rexroth for one-way flow control in hydraulic automation. It is sized as NS16, giving a passage dimension that suits medium-flow circuits. A threaded connection is provided, and the threads follow the UNF/UN form according to ANSI/ASME B1.1 so that it mates with standard tube fittings. Maximum operating pressure is 315 bar, allowing service in high-pressure manifolds, while the element opens only after a cracking pressure of 10 bar to prevent backflow under light loads. There is no pre-opening feature, which keeps the poppet fully seated until the threshold is reached. FKM seals are fitted to resist heat and aggressive fluids, and the assembly weight of 5.4 kg supports rigid mounting. Fluid cleanliness must not exceed ISO 4406 20/18/15, because tighter contamination limits help protect the seating surfaces from abrasion.
Four control areas define the hydraulic ratios that act on the poppet: A1 is 3.46 cm², A2 is 0.70 cm², A3 is 10.17 cm², and A4 is 1.13 cm²; these values set the pilot pressures needed for controlled opening or closing from different ports. The pilot oil drains externally through the Y port, ensuring that any leakage is routed back to tank instead of raising the cavity pressure. A pilot volume of 10.8 cm² at port X and 9.6 cm³ at port Y stores the fluid that shifts the poppet during actuation and must be considered when sizing control lines. Together, the defined areas and pilot volumes let system designers calculate response times and required pilot flow so the valve integrates correctly with servo or proportional controls.
Technical Specifications
Cleanliness Class
ISO 4406 20/18/15
Connection Type
Threaded Connection
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
10 bar
Maximum Operating Pressure
315 bar
Nominal Size
NS16
Pilot Oil Drain
External (Y Port)
Pilot Volume (port X)
10.8 cm2
Pilot Volume (port Y)
9.6 cm3
Pre-opening
None
Seal Material
FKM
Thread Standard
UNF/UN (ANSI/ASME B1.1)
Weight (threaded Connection)
5.4 kg
1620 Old Apex Road
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