Bosch Rexroth | SL10GA1-4X12
SL10GA1-4X/12
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The SL10GA1-4X/12 check valve is produced by Bosch Rexroth within the Hy-Check Valves series. It is installed in hydraulic automation circuits to allow flow in one direction and block return flow. The nominal size of 10 defines a passage area suited for mid-range flow rates in mobile or industrial equipment. A control spool area of 3.8 cm² sets the hydraulic force needed to pilot the valve open, while a seat poppet area of 1.33 cm² determines the sealing force when it is shut. Cracking pressure is fixed at 1.5 bar so the valve opens only after a slight upstream pressure rise. A pre-opening feature is included to smooth pressure transition and reduce shock during initial flow. The valve meets cleanliness class ISO 4406 20/18/15, so the circuit must limit particulate levels to that grade for consistent operation. Because the installation position can be any, designers can mount the unit horizontally or vertically without affecting function.
A threaded connection format simplifies plumbing; the body uses UNF/UN threads built to the ANSI/ASME B1.1 standard for interchangeability with common fittings. Maximum operating pressure is 350 bar, matching the maximum pilot pressure of 350 bar so the pilot line may be taken directly from the main supply. The design requires a minimum pilot pressure of 5 bar to shift the spool and override the check function. Pilot volume is 2.5 cm³ at port X and 2.0 cm³ at port Y, values that influence response time and the sizing of control lines. The assembled valve weighs 2.1 kg in its threaded version, light enough for direct mounting on machinery without added supports. Together these parameters define the valve’s capacity to provide reliable, pressure-responsive flow control in high-pressure hydraulic systems.
Technical Specifications
Cleanliness Class
ISO 4406 20/18/15
Connection Thread
UNF/UN
Connection Type
Threaded Connection
Control Spool Area (a3)
3.8 cm2
Cracking Pressure
1.5 bar
Installation Position
Any
Max Operating Pressure
350 bar
Maximum Pilot Pressure
350 bar
Minimum Pilot Pressure
5 bar
Nominal Size
10
Pilot Volume Port X
2.5 cm3
Pilot Volume Port Y
2.0 cm3
Pre-opening
Yes
Seat Poppet Area (a1)
1.33 cm2
Thread Standard
ANSI/ASME B1.1
Weight (threaded)
2.1 kg
1620 Old Apex Road
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