Bosch Rexroth | SF150B114X
SF150B114X/
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The SF150B114X/ prefill valve is manufactured by Bosch Rexroth as part of the SF Prefill Valves series. It is applied in hydraulic automation to charge large cylinders quickly before high-pressure strokes begin. The valve tolerates up to 350 bar, allowing it to operate in press circuits that demand high system pressure. A peak flow capability of 3,900 l/min at a differential pressure of 0.3 bar supports rapid filling cycles. Flow through the pilot stage is governed by a control spool that travels 29 mm and presents an effective area of 38.5 cm², so pilot oil can shift the main poppet reliably. Each housing screw must be tightened to 51 Nm to maintain internal sealing, and the body can be installed in any orientation, simplifying layout. Acceptable fluid temperatures range from −30 °C to +80 °C, covering common mineral oils and biodegradable blends under typical plant conditions.
The main poppet, which provides the bulk flow path, moves 35 mm and exposes an effective area of 153.9 cm² to system pressure, letting the valve open fully with modest pilot force. Port A is limited to 16 bar, protecting the pilot circuit from excessive load. The unit accepts fluids with viscosities up to 800 mm²/s, so it remains functional with cold start oil or specialized high-viscosity media. Proper attachment to the manifold uses twelve M36 × 150 screws, each tightened to 2,600 Nm to secure the 105 kg valve body against pressure reaction forces. Hydraulic oil cleanliness must be kept to ISO 4406 class 20/18/15 to avoid wear on the sliding elements and poppet seat. These mechanical, hydraulic, and installation limits define reliable service life in high-capacity presses and die-casting machines.
Technical Specifications
Cleanliness Class (iso 4406)
20/18/15
Control Spool Effective Area
38.5 cm2
Control Spool Stroke
29 mm
Housing Screw Torque
51 Nm
Installation Position
Any
Main Poppet Effective Area
153.9 cm2
Main Poppet Stroke
35 mm
Max Flow (case 1, Delta P 0.3 Bar)
3900 l/min
Maximum Fluid Temperature
+80 °C
Maximum Operating Pressure (b/x/y)
350 bar
Maximum Viscosity
800 mm2/s
Minimum Fluid Temperature
-30 °C
Port A Maximum Pressure
16 bar
Valve Mounting Screws
12 x M36 x 150
Valve Mounting Torque
2600 Nm
Weight (version B)
105 kg
1620 Old Apex Road
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