Bosch Rexroth | SV30PB2-4X
SV30PB2-4X/
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The SV30PB2-4X/ is a check valve from Bosch Rexroth in the Hy-Check Valves series that directs flow in hydraulic automation circuits. It complies with ISO 4406 cleanliness class 20/18/15, limiting solid contamination in the system fluid. Nominal size 32 specifies the internal passage dimensions, while the ISO 5781-09-13-0-16 porting pattern aligns the body with NG32 subplates, and subplate mounting simplifies service exchange. Flow is unrestricted from port A to B and permitted from B to A only when a pilot signal is applied, creating a one-way check function with controlled reverse flow. A cracking pressure of 5.0 bar determines the differential needed to unseat the poppet, and the unit is supplied without pre-opening so no bypass exists below that threshold. Maximum operating pressure of 350 bar enables use in high-pressure circuits.
Control areas of 5.72, 1.33, 16.61, and 1.54 cm² define the hydraulic forces acting on the poppet during pilot operation, and the pilot stage accepts control pressures from 5 to 315 bar to vary opening behavior. A control volume of 19.27 cm³ at port X indicates the oil required for pilot actuation, and the pilot oil returns internally, eliminating a separate drain connection. The valve carries up to 550 L/min, matching large-flow installations. It handles HL, HLP, HETG, HEPG, and HEES fluids so mineral or synthetic esters can be used, and it functions across a viscosity range of 2.8 to 500 mm²/s to maintain stable damping. Fluid temperature limits are −30 to +80 °C with NBR seals or −20 to +80 °C with FKM seals, supporting operation in varied ambient conditions.
Technical Specifications
Cleanliness Class
ISO 4406 (20/18/15)
Connection Type
Subplate Mounting
Control Areas (a1/a2/a3/a4)
5.72/1.33/16.61/1.54 cm²
Control Pressure Range
5 to 315 bar
Control Volume Port X
19.27 cm³
Cracking Pressure
5.0 bar
Flow Direction
A→B free; B→A with pilot
Fluid Temp Range
-30 to +80 °C (NBR); -20 to +80 °C (FKM)
Hydraulic Fluids
HL, HLP; HETG; HEPG; HEES
Max Flow
550 L/min
Max Operating Pressure
350 bar
Nominal Size
32
Pilot Oil Return
Internal
Porting Pattern
ISO 5781-09-13-0-16 (NG32)
Pre-opening
Without Pre-Opening
Viscosity Range
2.8 to 500 mm²/s
1620 Old Apex Road
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