Bosch Rexroth | ZSF-125-F1-1-2XM01
ZSF-125-F1-1-2X/M/01
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The ZSF-125-F1-1-2X/M/01 valve belongs to the ZSF Prefill Valves series and is manufactured by Bosch Rexroth for hydraulic automation where rapid cylinder filling and draining are required. With a nominal size of NG125, the body offers a large passage to move high volumes during press strokes. A flange connection secures the valve to the manifold and resists shifting under load. The valve’s port P uses a G1 thread compliant with ISO 228-1, while the pilot port X is supplied through a G3/8 thread of the same standard, simplifying pipe selection. During modulation, the control spool travels 22.5 mm to meter flow toward the main poppet, and the poppet itself can open 30.0 mm to minimize pressure losses once fully commanded. Only 0.12 bar of cracking pressure is required to initiate opening, letting low pilot signals start the prefill sequence. The housing and internal parts weigh 26 kg, indicating a sturdy design that withstands mechanical stress in large forming machines.
The valve can operate against system pressures up to 350 bar on ports b and P, allowing it to sit directly in high-pressure circuits. Backpressure at port A is limited to 16 bar, protecting return lines, and the pilot port X can tolerate up to 150 bar so common control manifolds can be used. Acceptable fluid temperatures range from −30 °C to +70 °C, enabling outdoor or heated shop installations. Hydraulic fluids with viscosities between 10 and 800 mm²/s can be used without impairing dynamic response. Contamination must be kept to ISO 4406 class 20/18/15 or cleaner to prevent erosion of the seating surfaces. All dynamic seals are made from NBR, giving compatibility with standard mineral oils while maintaining elasticity across the stated temperature window.
Technical Specifications
Cleanliness Class
ISO 4406 (c) 20/18/15
Connection Type
Flange
Control Spool Stroke
22.5 mm
Cracking Pressure
0.12 bar
Fluid Temperature
–30 to +70 °C
Main Poppet Stroke
30.0 mm
Max Operating Pressure (b, P)
350 bar
Max Pressure Port A
16 bar
Max Pressure Port X
150 bar
Nominal Size
NG125
Port P Thread
G1 (ISO 228-1)
Port X Thread
G3/8 (ISO 228-1)
Seal Material
NBR
Viscosity Range
10 to 800 mm2/s
Weight
26 kg
1620 Old Apex Road
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