Bosch Rexroth | SV20GB2-4X12
SV20GB2-4X/12
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The SV20GB2-4X/12 check valve belongs to the Hy-Check Valves series manufactured by Bosch Rexroth for hydraulic automation circuits. It offers a nominal size of 20, defining the flow path dimensions for medium-capacity manifolds. The unit withstands a maximum operating pressure of 315 bar so it can sit directly in high-pressure lines. A cracking pressure of 5.0 bar (code 2) guarantees that reverse flow is blocked until the set differential is reached. Flow is free from port A to B and permitted from B to A only when the pilot stage opens, giving directional control without additional logic elements. A control area A1 of 3.46 cm² determines the closing force needed on the main poppet, while a pilot volume of 10.8 cm³ at port X supplies the fluid required for smooth pilot movement during unlocking.
The valve tolerates pilot pressures up to 315 bar at port X, letting the circuit use full line pressure to release the check when demanded. Ports A and B carry 1 5/16-12 UN threads for direct connection to SAE blocks, and the pilot port features a 7/16-20 UNF thread to accept compact control fittings. Port Y is closed, removing the need for a drain line and simplifying manifold design. A control area A3 of 10.17 cm² on the pilot side enlarges the effective surface so lower pilot force can open the main poppet. The valve can be installed in any position, supporting flexible layout in crowded hydraulic assemblies. It conforms to ISO 4406 (c) 20/18/15 cleanliness class, which helps achieve an MTTFd of 150 years in properly filtered systems. A weight of 5.4 kg provides stable mounting while remaining manageable for manual installation.
Technical Specifications
Cleanliness Class
ISO 4406 (c) 20/18/15
Control Area A1
3.46 cm2
Control Area A3
10.17 cm2
Cracking Pressure (code 2)
5.0 bar
Flow Direction
A→B Free; B→A When Opened
Installation Position
Any
Maximum Operating Pressure
315 bar
Mttfd
150 Years
Nominal Size (ng)
20
Pilot Pressure Max
315 bar
Pilot Volume (port X)
10.8 cm3
Port A, B Thread (un)
1 5/16-12 UN
Port X Thread (unf)
7/16-20 UNF
Port Y
Closed
Weight
5.4 kg
1620 Old Apex Road
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