Bosch Rexroth | SL30GA1-4X12
SL30GA1-4X/12
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The SL30GA1-4X/12 check valve is part of the Hy-Check Valves series manufactured by Bosch Rexroth for hydraulic automation where reverse flow must be blocked until an external pilot command is given. It connects to the circuit through a threaded body that follows the UNF/UN thread form defined in ANSI/ASME B1.1, allowing direct screw-in mounting without custom adapters. The nominal size of 32 supports a maximum flow of 550 l/min so large cylinders or motors can be supplied without excessive pressure loss. A cracking pressure of 2.5 bar maintains line integrity yet permits rapid opening once the threshold is reached. Flow is free from port A to B and returns from B to A only when the pilot port is actuated, providing controlled directional behavior. The valve tolerates operating pressures up to 315 bar, matching high-pressure pump ratings, and it handles oil viscosities from 2.8 to 500 mm²/s for broad compatibility with standard mineral or synthetic hydraulic fluids.
A built-in pre-opening feature reduces pressure spikes when the valve shifts, improving circuit stability. The pilot stage accepts control pressures between 5 and 315 bar, so it can be driven directly by system pressure or a low-pressure logic line. Pilot oil volume requirements are 19.27 cm³ at port X and 17.5 cm³ at port Y, figures needed for sizing of control accumulators or signal lines. Because the pilot oil is returned externally through port Y, residual pressure in the main line does not hinder reseating. Clean fluid that meets ISO 4406 (c) 20/18/15 is required to prevent wear of sealing edges. The valve can be installed in any orientation, giving designers layout flexibility in compact power units or remote manifolds. Threaded construction results in a weight of 10 kg, so standard mounting brackets can support the assembly, integrating the SL30GA1-4X/12 into pressure-dependent sequencing and load-holding functions without additional check devices.
Technical Specifications
Cleanliness Class
ISO 4406 (c) 20/18/15
Connection Type
Threaded
Cracking Pressure
2.5 bar (NG32)
Direction Of Flow
Free A→B; B→A when opened
Installation Position
Any
Maximum Flow
550 l/min
Maximum Operating Pressure
315 bar
Nominal Size (ng)
32
Pilot Oil Return
External (Port Y)
Pilot Pressure Range
5 to 315 bar
Pilot Volume Port X
19.27 cm³
Pilot Volume Port Y
17.5 cm³
Pre-opening
Yes
Thread Standard
UNF/UN (ANSI/ASME B1.1)
Viscosity Range
2.8 to 500 mm²/s
Weight (threaded)
10 kg
1620 Old Apex Road
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