Bosch Rexroth | SL20PA2-4XV
SL20PA2-4X/V
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The SL20PA2-4X/V valve belongs to the Hy-Check Valves series from Bosch Rexroth and serves automated hydraulic circuits by preventing reverse flow and managing controlled pressure release. It fits NG20 manifolds because its nominal size is 20, giving designers a predictable envelope for medium-flow applications. A control area of 3.46 cm² on surface A1 supplies the main seating force, while a 0.70 cm² area on surface A2 creates the pilot ratio required for dependable lift. Flow is allowed from port A to port B so the downstream side cannot feed back into the supply. The element starts to crack at 5.0 bar, letting actuators vent with repeatable pressure. A pre-opening decompression feature limits line shock during transition, and subplate mounting makes removal possible without disturbing hard piping.
Additional characteristics help the valve integrate into high-pressure systems. A 1.13 cm² control area on surface A4 governs the decompression spool for smooth pilot control, and the body withstands operating pressures up to 315 bar for demanding presses or injection units. The porting pattern ISO 5781-08-10-0-16 matches common manifold blocks, reducing machining work. Pilot actuation draws 10.8 cm³ of oil through port X and returns 9.6 cm³ via the external Y port, so control line volume can be sized accurately; using an external return also separates pilot flow from the main channel for easier troubleshooting. FKM seals tolerate a wide range of hydraulic fluids, the valve can be installed in any orientation, and a weight of 4.7 kg permits manual handling during maintenance.
Technical Specifications
Control Area A1
3.46 cm2
Control Area A2
0.70 cm2
Control Area A4
1.13 cm2
Decompression Feature
With Pre-Opening
Direction Of Flow
A To B (Free Flow)
Installation Position
Any
Max Operating Pressure
315 bar
Nominal Size
20 (NG20)
Opening Pressure
5.0 bar
Pilot Oil Return
External (Port Y)
Pilot Volume (port X)
10.8 cm3
Pilot Volume (port Y)
9.6 cm3
Porting Pattern
ISO 5781-08-10-0-16
Seal Material
FKM
Type Of Connection
Subplate Mounting
Weight
4.7 kg
1620 Old Apex Road
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