Bosch Rexroth | SV20PB1-4X
SV20PB1-4X/
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The SV20PB1-4X/ valve belongs to the Hy-Check Valves series from Bosch Rexroth and is installed in hydraulic circuits to block or release flow on command. It fits nominal size 20 (NG20) interfaces and mounts on a subplate that uses the ISO 5781-08-10-0-16 porting pattern for straightforward manifold integration. Internal parts tolerate operating pressures up to 315 bar, while flow from port A to port B begins once the inlet reaches a cracking pressure of 2.5 bar. When pilot pressure opens the element, reverse flow from B to A is allowed and forward flow remains unrestricted. A control area of 3.46 cm² on the A1 side establishes the pilot force required for shifting, and the complete assembly weighs 4.7 kg for manageable handling during service.
An A3 control area of 10.17 cm² helps balance hydraulic forces as the valve recloses after pilot pressure drops. Pilot oil returns internally, removing the need for an external drain line, and the pilot chamber at port X holds 10.8 cm³ of fluid that must be displaced during each switching cycle. Port Y stays closed to stop unintended leakage paths, and there is no pre-opening feature, so the poppet remains fully seated until pilot pressure is applied. The unit can be installed in any orientation, which simplifies circuit layout, and system fluid should meet ISO 4406 (c) 20/18/15 cleanliness to protect sealing surfaces. A calculated MTTFd of 150 years signals a long statistical service life, supporting reliable operation in demanding hydraulic automation.
Technical Specifications
Cleanliness Class
ISO 4406 (c) 20/18/15
Control Area A1
3.46 cm²
Control Area A3
10.17 cm²
Cracking Pressure
2.5 bar
Direction Of Flow
Free A→B; Opened B→A
Installation Position
Any
Maximum Operating Pressure
315 bar
Mounting Type
Subplate
Mttfd Value
150 years
Nominal Size
20 (NG20)
Pilot Oil Return
Internal
Pilot Volume Port X
10.8 cm³
Port Y
Closed
Porting Pattern
ISO 5781-08-10-0-16
Pre-opening
None
Weight
4.7 kg
1620 Old Apex Road
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