Bosch Rexroth | SV20GB1-4X
SV20GB1-4X/
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The SV20GB1-4X/ from Bosch Rexroth belongs to the Hy-Check Valves series and serves hydraulic automation circuits by allowing controlled flow when a pilot signal is present. With a nominal size of 20, it uses G1 ports and a threaded connection to simplify direct line or manifold mounting. The unit tolerates up to 315 bar working pressure, while a cracking pressure of 2.5 bar determines the point at which flow begins in the forward direction. Orientation flexibility is provided because the installation position can be any direction. ISO 4406 cleanliness class 20/18/15 is required to protect the internal surfaces, and the valve weighs 5.4 kg for manageable handling during assembly.
Pilot operation demands at least 5 bar, and the pilot oil returns internally, eliminating an external drain. Port X uses a G1/4 thread and has a pilot volume of 10.8 cm³ to achieve quick actuation. NBR seals withstand common hydraulic media between −20 °C and +80 °C, covering typical ambient and fluid conditions. The design includes no pre-opening feature, so the poppet remains fully closed until the pilot reaches the required pressure. These characteristics collectively support dependable shut-off and release actions in high-pressure hydraulic systems.
Technical Specifications
Cleanliness Class
ISO 4406 20/18/15
Connection Type
Threaded
Cracking Pressure
2.5 bar
Hydraulic Fluid Temp Max (nbr)
+80 °C
Hydraulic Fluid Temp Min (nbr)
–20 °C
Installation Position
Any
Maximum Operating Pressure
315 bar
Minimum Pilot Pressure
5 bar
Nominal Size
20
Pilot Oil Return
Internal
Pilot Port X Thread
G1/4
Pilot Volume Port X
10.8 cm3
Port Size A/b
G1
Pre-opening
No
Seal Material
NBR
Weight
5.4 kg
1620 Old Apex Road
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