Bosch Rexroth | SL15GB1-4X12
SL15GB1-4X/12
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The SL15GB1-4X/12 check valve is built by Bosch Rexroth as part of the Hy-Check Valves series and serves hydraulic automation by blocking reverse flow until a pilot signal is applied. Nominal size 16 establishes its flow capacity for medium-size lines, while a threaded connection designated G simplifies installation. The threads follow the UNF/UN profile defined in ANSI/ASME B1.1, so it mates with common North American fittings. A maximum operating pressure of 315 bar lets the unit work in high-pressure circuits, and an opening pressure of 2.5 bar means forward flow begins with only a modest differential. The valve passes fluid freely from port A to port B and permits flow from B to A only when piloted, providing directional logic. No decompression feature is included, so full line pressure appears instantly once the poppet shifts. Control area A1 is 3.46 cm², defining the force that acts on the poppet in standard flow, and compatibility with HL or HLP oils to DIN 51524 supports use with common mineral hydraulic fluids.
Control area A3 measures 10.17 cm² and determines the hydraulic force when the valve is piloted from the opposite side. The pilot stage withstands up to 315 bar, allowing it to share the same pressure level as the main line without additional reducers. Pilot oil returns externally through port Y, keeping pilot fluid separate from the working flow. Required pilot volumes are 10.8 cm³ at port X and 9.6 cm³ at port Y, figures needed to size accumulators or timing orifices. Cleanliness class ISO 4406 (c) 20/18/15 specifies the particle limits necessary to protect the seating surfaces. In threaded form the valve weighs 5.4 kg, a practical consideration for mounting hardware and service handling. These characteristics allow precise integration of the SL15GB1-4X/12 into pressure-stable hydraulic circuits.
Technical Specifications
Cleanliness Class
ISO 4406 (c) 20/18/15
Connection Type
Threaded Connection (G)
Control Area A1
3.46 cm2
Control Area A3
10.17 cm2
Decompression Feature
None (B)
Flow Direction
Free A->B; B->A When Piloted
Hydraulic Fluid
HL, HLP (DIN 51524)
Maximum Operating Pressure
315 bar
Nominal Size
16
Opening Pressure
2.5 bar
Pilot Oil Return
External (Y)
Pilot Pressure Max
315 bar
Pilot Volume Port X
10.8 cm3
Pilot Volume Port Y
9.6 cm3
Thread Standard
UNF/UN (ANSI/ASME B1.1)
Weight (threaded)
5.4 kg
1620 Old Apex Road
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