Bosch Rexroth | FD32KA2XB06V
FD32KA2X/B06V
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The FD32KA2X/B06V check valve is produced by Bosch Rexroth as part of the FD Check Valves series and is intended to direct flow in hydraulic automation circuits while blocking reverse motion. It installs as a cartridge through manifold mounting to streamline piping and reduce leak paths. A main thread of M64 × 2 seats the body firmly in the cavity, and a separate control port with a G 1/4 thread accepts pilot connections for remote opening. Four M16 × 100 fixing screws in grade 10.9 are specified, and they must be tightened to 295 Nm so the sealing edges remain rigid under pressure cycles. The sealing material is FKM, allowing reliable operation with mineral oil classified HL or HLP per DIN 51524. The prescribed cleanliness level of ISO 4406 class 20/18/15 limits particle contamination that could damage the seat, and the valve weight of 7.5 kg influences manifold support design.
For proper function the valve should be mounted upright with port X on top, a position that eases air evacuation and keeps the pilot passages filled with oil. The cracking pressure from port A to port B is 2 bar, so reverse flow is blocked until the line reaches that differential. A 0.6 mm orifice in the pilot path creates a controlled pre-opening, and the area ratio of 1:20 between the pilot and main poppet moderates the speed of full opening to prevent shock. Maximum operating pressure reaches 420 bar at port B, while ports A and X are limited to 350 bar to match typical pump and pilot supplies. The design handles up to 560 liters per minute through ports A and B, supporting high-flow actuators where low pressure drop is required. These limits define the performance envelope and help engineers size cavities, actuators, and upstream plumbing.
Technical Specifications
Cleanliness Level
ISO 4406 (c) 20/18/15
Control Port Thread
G 1/4
Cracking Pressure (a→b)
2 bar
Fixing Screw Torque
295 Nm
Fixing Screws
4 × M16 × 100 (DIN 912-10.9)
Hydraulic Fluid
Mineral Oil (HL, HLP per DIN 51524)
Installation Position
Upright Preferred (Port X Up)
Main Thread (d3)
M64 × 2
Max Flow (ports A, B)
560 l/min
Max Operating Pressure (port B)
420 bar
Max Operating Pressure (ports A, X)
350 bar
Mounting Type
Manifold Mounting (Cartridge Valve)
Orifice Diameter
0.6 mm
Pre-opening Area Ratio
1:20
Sealing Material
FKM
Weight
7.5 kg
1620 Old Apex Road
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