Bosch Rexroth | SL20GA1-4X
SL20GA1-4X/
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The SL20GA1-4X/ valve belongs to the Hy-Check Valves series from Bosch Rexroth and is intended to secure hydraulic actuators by preventing reverse flow until a defined pilot signal is applied. It fits systems built around NG20 interfaces because its nominal size is 20, and the threaded connection allows direct line mounting without a sub-plate. A maximum operating pressure of 315 bar lets the unit work in high-pressure circuits, while a cracking pressure of 2.5 bar keeps the poppet seated until a small forward pressure is reached. The installation position can be any orientation, which simplifies layout inside complex manifolds. Hydraulic oil must meet ISO 4406 20/18/15 cleanliness so that internal sealing edges remain undamaged.
Remote release is handled through a pilot line; the pilot pressure may vary between 5 and 315 bar so the designer can match it to system logic. Once pressurized, control area A1 of 3.46 cm² and control area A3 of 10.17 cm² create the necessary hydraulic force to shift the poppet open. Pilot oil is returned externally through port Y, preventing back-pressure from influencing the internal spring chamber. The pilot circuit requires a volume of 10.8 cm³ at port X for actuation and discharges 9.6 cm³ at port Y, data that aids in sizing control lines and determining response time.
Technical Specifications
Cleanliness Class
ISO 4406 20/18/15
Connection Type
Threaded Connection
Control Area A1
3.46 cm2
Control Area A3
10.17 cm2
Cracking Pressure
2.5 bar
Installation Position
Any
Max Operating Pressure
315 bar
Nominal Size
20 (NG20)
Pilot Oil Return
External (Port Y)
Pilot Pressure Range
5 to 315 bar
Pilot Volume (port X)
10.8 cm3
Pilot Volume (port Y)
9.6 cm3
1620 Old Apex Road
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