Bosch Rexroth | FD25PA2XB06V
FD25PA2X/B06V
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The FD25PA2X/B06V valve is manufactured by Bosch Rexroth for the FD Check Valves series and serves as a blocking element in hydraulic automation where reverse flow must be prevented. It follows the ISO 5781-08-10-0-00 porting pattern, so it aligns with subplates drilled to that code. Port A can withstand pressures up to 350 bar while port B is rated for 420 bar, enabling use in high-pressure supply and return lines. The valve accommodates a maximum flow of 320 l/min, allowing medium-capacity circuits to operate without excessive pressure drop. A cracking pressure of 2 bar from A to B keeps the poppet seated until a defined upstream load is reached. When pilot pressure is introduced at port X, the pre-opening pressure of 20 bar and a pre-opening area ratio of 1:20 assist in controlled decompression before full opening. An internal orifice of 0.6 mm meters this pilot oil, ensuring gradual actuation and damped pressure transients.
Installation uses four M10 × 120 fixing screws tightened to 75 Nm, securing the valve to the manifold block. The control or measuring port is threaded G 1/4, providing a common point for pressure gauges or pilot lines. Flow enters or exits through 22 mm passage diameters at ports A and B, matching standard bore sizes in size 08 cavities. Sealing against the subplate is handled by an FKM material set, and each port uses an O-ring measuring 29.82 × 2.62 mm to prevent external leakage. The hydraulic fluid must be mineral oil graded HL or HLP, ensuring compatibility with the internal elastomers and wear surfaces. System cleanliness should meet ISO 4406 class 20/18/15 so the seat and pilot passages remain free of contamination. These mounting, sealing, and fluid requirements enable consistent behavior through the G 1/4 pilot interface and maintain the rated performance over the valve’s service life.
Technical Specifications
Cleanliness Level
ISO 4406 20/18/15
Control/measuring Port Thread
G 1/4
Cracking Pressure A To B
2 bar
Fixing Screw Torque
75 Nm
Fixing Screws
4x M10 × 120
Hydraulic Fluid
Mineral Oil (HL, HLP)
Maximum Flow
320 l/min
O-ring Size
29.82 × 2.62
Orifice Diameter
0.6 mm
Port A/b Diameter
22 mm
Port A/x Max Pressure
350 bar
Port B Max Pressure
420 bar
Porting Pattern
ISO 5781-08-10-0-00
Pre-opening Area Ratio
1:20
Pre-opening Pressure At X
20 bar
Sealing Material
FKM
1620 Old Apex Road
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