Bosch Rexroth | SV20GA2-4X
SV20GA2-4X/
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The SV20GA2-4X/ valve belongs to the Hy-Check Valves series and is manufactured by Bosch Rexroth for secure load holding in hydraulic automation. Its nominal size is NG20, making it suitable for medium-flow circuits, while a threaded connection lets technicians screw it directly into manifolds or line bodies. The unit withstands a maximum operating pressure of 315 bar so it can operate in high-pressure lines without derating. A cracking pressure of 5.0 bar keeps the poppet seated until a small reverse pressure is reached, and built-in pre-opening bleeds a limited flow to equalize pressure and soften full release. Because the installation position can be any, designers have flexibility when routing hoses. The assembled weight is 5.4 kg, which resists vibration in mobile equipment, and the internal passages must stay at ISO 4406 cleanliness class 20/18/15 to minimize wear on sealing edges.
A pilot supply of at least 5 bar is required to shift the control element, ensuring the valve remains locked when pilot pressure is weak. Pilot volume at port X is 10.8 cm³, setting the time it takes the control chamber to fill and thus influencing response speed. Pilot oil returns internally, so no external drain line is needed. Defined control areas manage hydraulic forces: A1 equals 3.46 cm², A2 equals 0.70 cm², A3 equals 10.17 cm², and A4 equals 1.13 cm²; these ratios establish how pilot pressure overcomes line pressure to open the flow path. Mounting screws must be tightened to 58 Nm to hold the body securely without distortion. Together, these parameters support reliable load retention and controlled release in automated hydraulic machinery.
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
5.0 bar
Installation Position
Any
Maximum Operating Pressure
315 bar
Minimum Pilot Pressure
5 bar
Mounting Screw Torque
58 Nm
Nominal Size
NG20
Pilot Oil Return
Internal
Pilot Volume Port X
10.8 cm3
Pre-opening
With Pre-Opening
Weight (threaded)
5.4 kg
1620 Old Apex Road
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