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The ZSF40F1-1-1X/M/12 belongs to the ZSF Prefill Valves series and is produced by Bosch Rexroth for rapid charge and discharge functions in hydraulic presses and similar automation stages. This pilot-operated valve is supplied in nominal size 40 so it can pass high volumes during low-pressure filling cycles. A flange connection forms the main interface to the manifold, while the P and X ports use UNF/UN threads to link pilot lines securely. The built-in 0.8 mm nozzle meters pilot oil to control opening speed, and a high-pressure connection is provided for the main line that closes the valve during pressing strokes. Because the unit weighs 4.2 kg it can be installed without lifting equipment, and its design allows any mounting position, giving designers freedom when arranging cylinders and reservoirs.
The valve is intended for mineral oil groups HL, HLP, HLPD, HVLP, and HVLPD, and fluid cleanliness must be maintained at 20/18/15 under ISO 4406 to protect the seating surfaces. Port B tolerates up to 350 bar, port X handles 150 bar pilot pressure, while port A is limited to 16 bar during suction duty, matching typical differential demands in press circuits. NBR seals contain these pressures and provide compatibility with the listed oil types. The assembly is delivered without a directional valve, so pilot flow must be supplied by an external control element. These limits define the safe operating envelope for the prefill function without imposing orientation or service restrictions.
Cleanliness Class
20/18/15 (ISO 4406)
Directional Valve Set-up
Without
High-pressure Connection
Yes
Hydraulic Fluid (mineral Oils)
HL, HLP, HLPD, HVLP, HVLPD
Installation Position
Any
Max Operating Pressure (port A)
16 bar
Max Operating Pressure (port B,p)
350 bar
Max Operating Pressure (port X)
150 bar
Nominal Size
40
Nozzle Diameter
0.8 mm
Ports P/x Connection
UNF/UN
Seal Material
NBR
Type Of Connection
Flange
Valve Type
Prefill Valve (Pilot-Operated)
Weight
4.2 kg
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