Bosch Rexroth | FD25PA2XB04V
FD25PA2X/B04V
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The FD25PA2X/B04V valve is manufactured by Bosch Rexroth and belongs to the FD Check Valves series. It functions as a pilot-operated element that locks hydraulic actuators and prevents reverse flow in automated machines. The maximum operating pressure on port B is 420 bar, allowing the unit to secure high-pressure return lines, while port A tolerates 350 bar to match common supply circuits. A flow capacity of 320 l/min through ports A and B permits use with medium to large pumps. The cracking pressure in the A-to-b direction is set at 2 bar so the valve opens with minimal energy loss. A 0.4 mm orifice meters pilot oil and stabilizes the poppet movement. The pre-opening area ratio of 1:20 helps pilot pressure overcome spring forces efficiently.
Control port X accepts pilot pressures from 20 bar to 350 bar, enabling reliable shifting across typical system ranges. The valve is intended for mineral oil classified as HL or HLP to DIN 51524, ensuring compatibility with standard plant fluids. Operating fluid temperatures can vary from −20 °C to 80 °C, supporting cold starts and elevated running conditions. A cleanliness level of ISO 4406 (c) 20/18/15 is required to protect internal sealing edges from particulate wear. FKM seals resist heat and oil aging, extending service intervals. The ISO 5781-08-10-0-00 porting pattern allows mounting on standardized subplates without adapters. A 22 mm port diameter on passages A and B accommodates the stated flow while limiting velocity-related pressure drop. The assembly weighs 18 kg, which must be supported by the manifold or frame during installation.
Technical Specifications
Control Pressure Max (port X)
350 bar
Control Pressure Min (port X)
20 bar
Cracking Pressure A→b
2 bar
Fluid Cleanliness
ISO 4406 (c) 20/18/15
Hydraulic Fluid
Mineral oil (HL, HLP) per DIN 51524
Hydraulic Fluid Temp Max
+80 °C
Hydraulic Fluid Temp Min
−20 °C
Max Flow (port A/b)
320 l/min
Max Operating Pressure (port A)
350 bar
Max Operating Pressure (port B)
420 bar
Orifice Diameter
0.4 mm
Port Diameter (a/b)
22 mm
Porting Pattern
ISO 5781-08-10-0-00
Pre-opening Area Ratio
1:20
Sealing Material
FKM
Weight
18 kg
1620 Old Apex Road
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