Bosch Rexroth | SL30GA1-4X
SL30GA1-4X/
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The SL30GA1-4X/ check valve is produced by Bosch Rexroth for the Hy-Check Valves series and serves as a blocking element in hydraulic automation circuits. With a nominal size of 32, the valve handles high flow rates typical of large installations. Its threaded connection streamlines mounting, while G1 1/2 threads on ports A and B match common pressure lines to avoid extra adapters. G1/4 threads on ports X and Y provide compact pilot links for remote control. A cracking pressure of 2.5 bar keeps the passage closed until the system reaches that value. The pre-opening feature initiates flow before full pilot pressure arrives, improving response. A maximum operating pressure of 315 bar permits operation in high-pressure loops, and the pilot stage functions with signals from 5 bar up to the same 315 bar limit.
Oil cleanliness to ISO 4406 class 20/18/15 is required to restrict wear in the seat and poppet areas. An operating temperature window from –20 °C to +80 °C allows use in cold mobile equipment and warm industrial plants without damaging seals. Viscosity up to 500 mm²/s keeps internal damping predictable during start-up. An external pilot oil return separates pilot flow from the main circuit, letting closed-center systems depressurize the control cavity after shifting. Pilot cavity volumes are 19.27 cm³ at port X and 17.5 cm³ at port Y; these volumes define how much oil must move during opening and closing, which sets switching speed.
Technical Specifications
Cleanliness Class
ISO 4406 20/18/15
Connection Type
Threaded Connection
Cracking Pressure
2.5 bar
Hydraulic Fluid Temp Max
+80 °C
Hydraulic Fluid Temp Min
-20 °C
Maximum Operating Pressure
315 bar
Nominal Size
32
Pilot Oil Return
External
Pilot Pressure Max
315 bar
Pilot Pressure Min
5 bar
Pilot Volume Port X
19.27 cm3
Pilot Volume Port Y
17.5 cm3
Port A/b Thread
G1 1/2
Port X/y Thread
G1/4
Pre-opening
Yes
Viscosity Max
500 mm2/s
1620 Old Apex Road
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