Bosch Rexroth | SV20PA1-4X
SV20PA1-4X/
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The SV20PA1-4X/ valve belongs to the Hy-Check Valves series and is manufactured by Bosch Rexroth for hydraulic automation tasks that need reliable reverse-flow blocking with pilot release. It is supplied in nominal size 20, fits subplate mounting surfaces, and follows the porting pattern ISO 5781-08-10-0-16 so it drops into standardized manifold stations. Flow from A to B is free, whereas flow from B to A is pilot-controlled, allowing circuit designers to sequence actuators without external check devices. A pre-opening function softens transients before the main poppet lifts, and the element cracks open at 2.5 bar for low resistance startup. The effective control area A1 is 3.46 cm², which determines the hydraulic force holding the poppet on its seat. A pilot volume of 10.8 cm³ is provided, minimizing response delay when the pilot signal is applied.
For continuous duty the valve withstands operating pressures up to 315 bar and requires a minimum pilot pressure of 5 bar to unlock reverse flow. The secondary control area A3 equals 10.17 cm², creating a differential large enough to secure tight shutoff when the pilot line is vented. Pilot oil drains internally, eliminating extra plumbing, and the body can be installed in any orientation to suit crowded power units. System cleanliness should reach ISO 4406 20/18/15 to maintain poppet integrity. With a mass of 4.7 kg the housing remains stable on the manifold, and the device offers an MTTFd of 150 years for use in safety-related circuits.
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
2.5 bar
Direction Of Flow
A→B Free; B→A Piloted
Installation Position
Any
Maximum Operating Pressure
315 bar
Minimum Pilot Pressure
5 bar
Mttfd
150 Years
Nominal Size
20
Pilot Oil Drain
Internal
Pilot Volume (x)
10.8 cm³
Porting Pattern
ISO 5781-08-10-0-16
Pre-opening
Yes
Weight
4.7 kg
1620 Old Apex Road
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