Bosch Rexroth | Z2FS16-31S2
Z2FS16-31/S2
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The Z2FS16-31/S2 belongs to the Z2FS Throttle Check Valves series from Bosch Rexroth and is used to meter flow in hydraulic automation stacks. Its nominal size of 16 sets the internal passage area suitable for medium-capacity circuits, while the CETOP D07 pattern matches common subplates for directional valve assemblies. The sandwich plate mounting style lets the valve sit between other stack elements without extra piping, and the ISO 4401-07-07-0-05 interface keeps port locations consistent for quick replacement. Four M10-10.9 screws and two M6-10.9 screws clamp the body firmly to withstand working loads, and four ports give separate channels for pressure, tank, and actuator lines in a compact block. The unit accepts fluid viscosities from 10 to 800 mm²/s so it can operate with thin startup oil and thicker warmed oil alike. A mass of 4.46 kg must be considered when sizing manifold supports and cabinet hardware.
An internal hexagon spindle provides the flow-setting adjustment and discourages unintentional changes in the field; technicians use an SW6 wrench to reach the spindle recess. The discharge-side throttling variant designated S2 restricts return flow, allowing controlled actuator deceleration without affecting the supply line. Maximum flow capacity is 250 l/min, matching many press and machine tool circuits that demand rapid movement. When the check element is closed, reverse leakage remains limited to 0.8 l/min at 100 bar, which helps maintain cylinder position under load. Continuous service is permitted up to 350 bar, enabling use in high-pressure systems without derating. The valve can run with HL, HLP, HLPD, HVLP, HVLPD, or water-glycol HFC fluids, giving flexibility for plant fluid standards and fire-resistant installations.
Technical Specifications
Adjustment Type
Internal Hexagon Spindle
Cetop Size
D07
Check Valve Leakage
0.8 l/min at 100 bar
Hydraulic Fluids
HL, HLP, HLPD, HVLP, HVLPD, HFC
Max Flow
250 l/min
Max Operating Pressure
350 bar
Mounting Interface
ISO 4401-07-07-0-05
Mounting Screws
4×M10-10.9 and 2×M6-10.9
Mounting Type
Sandwich Plate
Nominal Size
16
Number Of Ports
4
Spindle Wrench Size
SW6
Throttling Version
Discharge (S2)
Viscosity Range
10 to 800 mm²/s
Weight
4.46 kg
1620 Old Apex Road
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