Bosch Rexroth | FD25KA2XB04V
FD25KA2X/B04V
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The FD25KA2X/B04V check valve belongs to the FD Check Valves series and is manufactured by Bosch Rexroth for hydraulic circuits that need reliable flow blocking and automatic reverse shut-off. It installs as a cartridge in a manifold because its designated mounting type is manifold cartridge, and it seats through an M52 × 2 thread on the body. A separate control port uses a G 1/4 thread, allowing pilot oil to act on the valve. The internal area ratio of 1:20 between the pre-opening chamber and the load side supports pilot-operated release. The element opens when differential pressure reaches the 2 bar cracking point from port A to port b, after which flow up to 320 l/min can pass. A 0.4 mm orifice limits pilot flow, and the design is intended for mineral oil of the HL or HLP type.
During service the FD25KA2X/B04V withstands 350 bar at ports a and X, while port b tolerates up to 420 bar, so it suits medium-pressure and high-pressure manifolds. Operation remains stable in ambient temperatures from −20 °C to +80 °C, and sealing is provided by FKM material to maintain leak-tight performance within that range. The valve must be installed in systems whose fluid cleanliness is kept to ISO 4406 (c) 20/18/15 to protect the seat surfaces. Secure seating in the cavity is achieved by tightening the cartridge to 110 Nm, and the complete assembly weighs 5.6 kg, allowing straightforward handling during maintenance. These characteristics help the valve support dependable hydraulic automation without additional external components.
Technical Specifications
Ambient Temperature Max
+80 °C
Ambient Temperature Min
-20 °C
Area Ratio (pre-opening:load)
1:20
Cartridge Thread
M52 × 2
Cleanliness Level
ISO 4406 (c) 20/18/15
Control Port Thread
G 1/4
Cracking Pressure A→b
2 bar
Hydraulic Fluid
Mineral Oil (HL, HLP)
Max Flow (a, B)
320 l/min
Max Operating Pressure (a, X)
350 bar
Max Operating Pressure (b)
420 bar
Mounting Type
Manifold (Cartridge)
Orifice Diameter
0.4 mm
Sealing Material
FKM
Tightening Torque (cartridge)
110 Nm
Weight
5.6 kg
1620 Old Apex Road
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