Bosch Rexroth | SL20PA1-4XV
SL20PA1-4X/V
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The SL20PA1-4X/V check valve belongs to the Hy-Check Valves series and is manufactured by Bosch Rexroth for hydraulic automation circuits that need directional blocking with controlled release. It interfaces with NG20 manifolds, as its nominal size is 20, and is installed through subplate mounting identified by code P. A standardized porting pattern of ISO 5781-08-10-0-16 aligns the valve body with common system plates. During operation, flow moves freely from port A to port B, while a cracking pressure of 2.5 bar initiates opening to avoid premature backflow. The design includes pre-opening marked by code A so pressure transients are reduced when the valve shifts. System limits reach up to 350 bar of operating pressure, making the unit suitable for high-pressure loops that use mineral oil HL or HLP in accordance with DIN 51524. To safeguard internal components, the hydraulic fluid must be filtered to cleanliness class ISO 4406 20/18/15.
In pilot-controlled closing, the valve relies on a control area of 3.46 cm² on surface A1 and 10.17 cm² on surface A3 to generate the differential force that reseats the poppet. The pilot cavities hold 10.8 cm³ at port x and 9.6 cm³ at port y, volumes that determine the response time when pressure arrives. Pilot oil is routed out of the housing through external port Y, preventing accumulation in the subplate. An FKM seal set contains the working fluid against the moving elements and supports operation with elevated oil temperatures. The assembled subplate version weighs 4.7 kg, allowing straightforward handling during service or manifold replacement. These geometric and material figures complement the performance limits stated earlier and define how the SL20PA1-4X/V maintains reliable check functionality within compact hydraulic manifolds.
Technical Specifications
Cleanliness Class
ISO 4406 20/18/15
Control Area A1
3.46 cm²
Control Area A3
10.17 cm²
Control Port Volume (x)
10.8 cm³
Control Port Volume (y)
9.6 cm³
Cracking Pressure
2.5 bar
Flow Direction
A→B Free Flow
Hydraulic Fluid
Mineral Oil HL, HLP (DIN 51524)
Max Operating Pressure
350 bar
Mounting
Subplate Mounting (P)
Nominal Size
20 (NG20)
Pilot Oil Return
External (Port Y)
Porting Pattern
ISO 5781-08-10-0-16
Pre-opening
With Pre-Opening (A)
Seal Material
FKM
Weight (subplate)
4.7 kg
1620 Old Apex Road
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