Bosch Rexroth | SV20PB3-4X
SV20PB3-4X/
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The SV20PB3-4X/ check valve belongs to the Hy-Check Valves series from Bosch Rexroth and controls directional flow in hydraulic automation circuits. It is manufactured in size NG20, establishing interface dimensions for modular manifolds, and uses subplate mounting to attach directly to standardized base plates. A weight of 4.7 kg allows manual handling during assembly and maintenance. The porting pattern ISO 5781-08-10-0-16 aligns its ports with common NG20 subplates. A control area of 3.46 cm² on side A1 sets the pilot force needed to open the valve from B to A, while a larger 10.17 cm² area on side A3 influences the reverse actuation characteristics. Flow is free from A to B and requires pilot opening from B to A, so it works as a pilot-operated check in one direction. A cracking pressure of 7.5 bar blocks unintended flow until this threshold is reached.
A maximum operating pressure of 315 bar defines the highest line pressure tolerated, and the same 315 bar pilot pressure rating lets the valve release fully under peak system conditions. A pilot volume of 10.8 cm³ at port X specifies the oil required to shift the internal element during opening. Internal pilot oil return sends displaced fluid back into the main port, eliminating an external drain line. The valve can be mounted in any position, adding flexibility to layout planning. It is supplied without a pre-opening feature, so pilot pressure alone initiates movement. Hydraulic fluid must meet ISO 4406 cleanliness class 20/18/15 to avoid wear on sealing surfaces. An MTTFd of 150 years indicates a low probability of dangerous failure throughout its service life.
Technical Specifications
Cleanliness Class
ISO 4406 20/18/15
Connection Type
Subplate Mounting
Control Area A1
3.46 cm2
Control Area A3
10.17 cm2
Cracking Pressure
7.5 bar
Direction Of Flow
A to B Free; B to A By Opening
Installation Position
Any
Maximum Operating Pressure
315 bar
Mttfd
150 Years
Pilot Oil Return
Internal
Pilot Pressure (max)
315 bar
Pilot Volume, Port X
10.8 cm3
Porting Pattern
ISO 5781-08-10-0-16
Pre-opening
None
Size
NG20
Weight (subplate Mounting)
4.7 kg
1620 Old Apex Road
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