Bosch Rexroth | SV20PB1-4XV
SV20PB1-4X/V
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The SV20PB1-4X/V valve is produced by Bosch Rexroth for the Hy-Check Valves series and serves as a pilot-operated check element in hydraulic automation. Its nominal size is NG20, and the body withstands a maximum operating pressure of 315 bar for high-pressure circuits. Flow passes freely from port A to port B, while reverse flow is blocked until a minimum pilot pressure of 5 bar is applied. A cracking pressure of 2.5 bar determines the initial poppet lift, and a control area A1 of 3.46 cm² defines the pilot force requirement. The pilot oil is returned internally, and a pilot volume of 10.8 cm³ limits the fluid displaced during actuation, supporting rapid response.
Subplate mounting is specified as the connection type, and the ISO 5781-08-10-0-16 porting pattern ensures manifold compatibility. The valve can be installed in any position, and no pre-opening feature is included, so backflow remains sealed until pilot pressure acts. FKM seals provide chemical resistance, while a cleanliness class of ISO 4406 20/18/15 indicates the fluid purity the unit requires. Service weight is 4.7 kg, which simplifies handling during assembly or maintenance. A mean time to dangerous failure of 150 years supports long-term reliability in safety-related hydraulic locking or load-holding functions.
Technical Specifications
Cleanliness Class
ISO 4406 20/18/15
Control Area A1
3.46 cm²
Cracking Pressure
2.5 bar
Free-flow Direction
A→B
Installation Position
Any
Maximum Operating Pressure
315 bar
Minimum Pilot Pressure
5 bar
Mttfd
150 years
Nominal Size
NG20
Pilot Oil Return
Internal
Pilot Volume (port X)
10.8 cm³
Porting Pattern
ISO 5781-08-10-0-16
Pre-opening
None
Seal Material
FKM
Type Of Connection
Subplate Mounting
Weight
4.7 kg
1620 Old Apex Road
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