Bosch Rexroth | SL20PA1-4X
SL20PA1-4X/
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The SL20PA1-4X/ check valve belongs to the Hy-Check Valves series from Bosch Rexroth and is installed in hydraulic automation to block or open flow as commanded by pilot pressure. A poppet seat is used so the sealing line withstands high pressure without leakage, while the direction of flow is free from A to B and opened from B to A, allowing one-way passage until a pilot signal reverses it. The unit tolerates a maximum operating pressure of 315 bar for compatibility with high-pressure manifolds, and it begins to lift at a cracking pressure of 2.5 bar so low back-pressure circuits can start flow quickly. A pre-opening feature is present to soften pressure spikes during actuation, and the nominal size 20 passage establishes the flow capacity expected in ISO size 08 cavities. The ISO 5781-08-10-0-16 porting pattern matches standard subplates, and the subplate mounting connection simplifies replacement. Because the installation position can be any orientation, designers are free to place the body wherever space allows.
The control area A1 measures 3.46 cm², setting the force developed by pilot oil so the poppet opens predictably against line pressure. A minimum pilot pressure of 5 bar is required to achieve that force, assuring reliable reverse flow even when system pressure is low. Pilot volume demand is 10.8 cm³ at port X and 9.6 cm³ at port Y, data used to size control lines and sequence valves. Pilot oil is returned externally, preventing pressure buildup in the housing and keeping the main flow path uncontaminated. Hydraulic cleanliness must not exceed ISO 4406 20/18/15 so the poppet and seat avoid abrasive wear during repeated cycles. The subplate that supports the valve weighs 4.7 kg, information relevant for manifold load calculations and handling during maintenance.
Technical Specifications
Cleanliness Class
ISO 4406 20/18/15
Control Area A1
3.46 cm²
Cracking Pressure
2.5 bar
Direction Of Flow
A→B Free; B→A By Opening
Installation Position
Any
Max Operating Pressure
315 bar
Minimum Pilot Pressure
5 bar
Nominal Size
20
Pilot Oil Return
External
Pilot Volume Port X
10.8 cm³
Pilot Volume Port Y
9.6 cm³
Porting Pattern
ISO 5781-08-10-0-16
Pre-opening
Present
Seat Type
Poppet
Type Of Connection
Subplate Mounting
Weight (subplate)
4.7 kg
1620 Old Apex Road
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