Bosch Rexroth | FD12KA2XB03V
FD12KA2X/B03V
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The FD12KA2X/B03V check valve belongs to the FD Check Valves series from Bosch Rexroth and is applied in hydraulic automation to block reverse flow until a pilot signal lifts the poppet. Its cracking pressure from port A to port b is 2 bar, so minor back-pressure must build before flow starts. When pilot pressure is introduced at port x, the valve begins opening at 20 bar, and a pre-opening area ratio of 1:20 balances the internal forces during that transition. The unit tolerates 350 bar on ports a and x and 420 bar on port b, giving headroom for high-pressure circuits. A maximum flow rate of 80 l/min supports medium-volume transmission without excessive pressure loss. Cartridge construction for manifold mounting allows the valve to sit directly in a block, minimizing external lines, and an assembled weight of 2.8 kg suits compact manifold layouts.
The control port is machined with a G 1/4 thread so installers can attach the pilot line with standard fittings. The cartridge body must be torqued to 65 Nm when screwed into its cavity, and four M10 × 70 fixing screws compliant with DIN 912-10.9 secure the cover; each screw is tightened to 69 Nm for uniform clamping. A 0.3 mm orifice meters pilot flow and dampens pressure spikes. FKM sealing material resists mineral oil and elevated temperatures, matching the specified HL or HLP hydraulic fluids. System cleanliness must reach ISO 4406 (c) 20/18/15 to prevent poppet wear and leakage. These installation, sealing, and fluid requirements combine to keep the check function reliable through prolonged service.
Technical Specifications
Area Ratio (pre-opening)
1:20
Begin Opening Pressure (x)
20 bar
Cartridge Tightening Torque
65 Nm
Cleanliness Level
ISO 4406 (c) 20/18/15
Control Port Thread
G 1/4
Cracking Pressure A→b
2 bar
Fixing Screw Tightening Torque
69 Nm
Fixing Screws
4× M10×70 (DIN 912-10.9)
Hydraulic Fluid
Mineral Oil (HL, HLP)
Max Flow (a,b)
80 l/min
Max Operating Pressure (a,x)
350 bar
Max Operating Pressure (b)
420 bar
Mounting Type
Manifold (Cartridge)
Orifice Diameter
0.3 mm
Seal Material
FKM (V)
Weight
2.8 kg
1620 Old Apex Road
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