Manufacturer & Model​

Rexroth, Type Z2FS

Part Number​

R900457256

Variant​

Z2FS16-8-3X/S2

Function​

Single Throttle Valve with Integrated Check Valve

Port Size​

NG16 (CETOP 7, 3/4" UNF)

Port Connection​

Subplate mounting, ISO 4401-06-... interface

Configuration​

Single adjustable throttle element with reverse free-flow check valve.

Flow Direction​

Adjustable throttling from Port 1 (P) → Port 2 (A). Free check valve flow from Port 2 (A) → Port 1 (P).

Adjustment Type​

Handwheel with fine thread and separate locking nut.

Max. Operating Pressure​

315 bar

Max. Flow Rate​

~ 100 l/min (Dependent on pressure drop and setting)

Pressure Drop (Typical)​

Refer to manufacturer's performance curves (Δp-Q) for specific data.

Setting Range​

Continuously adjustable from nearly closed to fully open.

Pressure Compensation​

No. This is a non-compensated, adjustable orifice valve.

Housing Material​

Steel

Seals​

As per "/S2" variant: Typically indicates a specific seal or material version. The standard for "/S" variants is usually FKM (Viton). The "S2" may denote a revision or a specific sub-variant. Consult the official datasheet for confirmation.

Fluid Compatibility​

Mineral-based hydraulic oils (HL, HLP) to ISO 11158. Compatible with HFD fluids when using standard FKM seals.

Operating Temperature Range​

-20°C to +80°C (with standard FKM seals)

Fluid Viscosity Range​

10 to 380 mm²/s

Cleanliness Requirement​

Minimum ISO 4406 20/18/15. Installation of a pressure line filter (10 µm nominal) is essential.

Weight​

Approximately 5.5 kg

Application​

Designed for precise speed control (metering) of hydraulic actuators in one direction. The integrated check valve allows for free return flow. Commonly used in pairs to independently control extension and retraction speeds of cylinders in applications like injection molding machines, presses, and industrial automation.

Standards​

ISO 4401 (Mounting interface), CETOP