Bosch Rexroth | ZSF63F1-1-1XM01
ZSF63F1-1-1X/M/01
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The ZSF63F1-1-1X/M/01 prefill valve is part of the ZSF Prefill Valves series manufactured by Bosch Rexroth for rapid filling and emptying functions in hydraulic automation. Its nominal size of 63 establishes a large flow cross-section suited for high-volume cylinders, while the flange connection allows rigid mounting directly to a manifold or reservoir. The valve can be installed in any position, giving designers flexibility in compact power units. Because the directional valve set-up is absent, external control circuitry must supply the pilot signal for opening and closing events. Port B and P withstand up to 350 bar so the unit can handle main system pressure, whereas port A is limited to 16 bar to protect the tank return path. Threads follow ISO 228-1; port P is cut to G3/4, permitting common pipe fittings. A cleanliness class of ISO 4406 20/18/15 is required to keep the seating surfaces free from abrasive particles.
Port X endures a maximum of 150 bar, which defines the highest pilot pressure that may be applied, and its G1/4 thread supports compact tubing typically used in pilot lines. The absence of pre-decompression means the poppet opens in a single step without staged pressure relief. An unchecking ratio of 4.6 ensures the poppet reseats reliably when system pressure reverses. Opening the valve consumes 7.8 cm³ of pilot oil, a figure important when sizing the external control valve and line. NBR sealing material resists common mineral hydraulic fluids and maintains tight closure over a broad temperature range. The complete assembly weighs 7 kg, so a single technician can install or replace it without lifting equipment.
Technical Specifications
Cleanliness Class
ISO 4406 20/18/15
Connection Type
Flange
Directional Valve Set-up
None (External Control)
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
63
Pilot Volume For Opening
7.8 cm3
Port P Thread
G3/4
Port X Thread
G1/4
Ports Thread Standard
ISO 228-1
Pre-decompression
None
Seal Material
NBR
Unchecking Ratio (no Pre-decomp.)
4.6
Weight
7 kg
1620 Old Apex Road
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