REXROTH Z2FS16-31/S2 R900457256

Rexroth NG16 Double Throttle Check Valve Z2FS 16-31/S2

Description

This is a Rexroth Z2FS 16-31/S2, a high-performance double throttle check valve in a sandwich plate design. It is used to control the flow rate of a hydraulic fluid, typically to manage the speed of an actuator. This model provides meter-out control and features two symmetrically arranged throttle check valves for fine adjustment in both flow directions. Its robust construction ensures reliability in demanding industrial hydraulic applications.

Specifications

• Manufacturer: Rexroth
• Type: Z2FS 16-31/S2
• Material Number: R900457256
• Nominal Size: NG16 / CETOP 7
• Valve Type: Throttle Check Valve, Sandwich Plate
• Control Function: Meter-out (Supply flow from A to A1 and B to B1 is throttled)
• Adjustment Element: Spindle with hexagon and protective cap
• Maximum Operating Pressure: 315 bar
• Maximum Flow Rate: 200 l/min
• Hydraulic Fluid: Mineral oil (HL, HLP) according to DIN 51524

Label Info

• Manufacturer: MANNESMANN REXROTH
• Model: Z 2 FS 16-31/S2
• Part Number: 457 256

Application

This valve is ideal for use in general industrial machinery, machine tools, presses, and material handling equipment where precise speed control of hydraulic cylinders or motors is required. The sandwich plate design allows for easy integration into existing valve stacks.

Country of Origin

Made in Germany.

CO2 Impact

By purchasing this reused component, you are avoiding approximately 12 kg of CO2 emissions associated with the production of a new one. This choice supports sustainable industrial practices and reduces your environmental footprint.

Availability

This item is a used, tested component in good working condition. Ready for immediate dispatch. Order now from spareparts2day for expert support and fast delivery.

FAQ

What is the function of the “S2” designation in the Z2FS 16-31/S2 model number?

The “S” indicates meter-out control, meaning the valve throttles the flow leaving the actuator. The “2” signifies that there are two symmetrically arranged throttle check valves, allowing independent adjustment for both directions of actuator movement (e.g., extend and retract speeds of a cylinder).

What is the recommended hydraulic fluid cleanliness level for this NG16 valve?

For optimal performance and long service life, Rexroth recommends a fluid cleanliness class of at least 20/18/15 according to ISO 4406. Using proper filtration is crucial to prevent contamination and internal wear.

Can this valve be used for meter-in control?

No, the Z2FS model is specifically designed for meter-out control. For meter-in applications, Rexroth offers the Z2FSK series, which has a different internal configuration.

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Last Update: Friday, March 13, 2026