Bosch Rexroth | FD12FB2X200B03V
FD12FB2X/200B03V
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The FD12FB2X/200B03V check valve belongs to the FD Check Valves series and is manufactured by Bosch Rexroth for hydraulic automation tasks that demand one-way flow with integrated pressure relief. Its SAE flange with relief valve design allows direct manifold mounting and combines flow checking with over-pressure protection. The size 12 body supports a maximum flow of 80 l/min, meeting the requirements of medium-capacity cylinders and motors. Port b tolerates operating pressures up to 420 bar, while ports a and x are limited to 350 bar to align with common pump ratings. Flow from a to b begins once the cracking pressure reaches 2 bar, and reverse flow from b to a starts opening at 20 bar to soften load-induced pressure peaks. A fixed control-to-load pressure ratio of 1:20 stabilizes pilot operation and prevents chatter under varying loads.
The pilot port x is machined with a G1/4 thread and accepts control pressures up to 350 bar, giving a standard interface for remote unloading lines. System cleanliness must stay within ISO 4406 class 20/18/15 so that poppet and seat wear remain minimal. The valve is intended for use with mineral oil in the HL or HLP categories, ensuring material compatibility and predictable viscosity behavior. A 0.3 mm damping orifice meters pilot flow to prevent pressure spikes during actuation. Dynamic joints are sealed with FKM material, and the primary face seal employs a 25 × 3.5 mm O-ring to secure the flange connection. The assembled body weighs 9 kg, so mounting hardware must support its mass without inducing stress on the hydraulic lines.
Technical Specifications
Cleanliness Class
ISO 4406 20/18/15
Control Port Thread (x)
G1/4
Control Pressure Max (x)
350 bar
Control To Load Pressure Ratio
1:20
Cracking Pressure (a To B)
2 bar
Design
SAE Flange With Relief Valve
Hydraulic Fluid
Mineral Oil (HL, HLP)
Max Flow (size 12)
80 l/min
Max Operating Pressure (a,x)
350 bar
Max Operating Pressure (b)
420 bar
O-ring Size
25 × 3.5 mm
Opening Starts (b To A)
20 bar
Orifice Diameter
0.3 mm
Sealing Material
FKM
Size
12
Weight
9 kg
1620 Old Apex Road
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