R900459203 Z2FS16-8-3X/S German Rexroth one-way throttle valve

FAQ: R900459203 Z2FS16-8-3X/S One-Way Throttle Valve

Q1: What is the core function of this component?

A:​ It is a manually-adjustable throttle valve with an integrated check valve. It provides a variable orifice to precisely restrict and control fluid flow in one direction (from Port 1 to Port 2), while allowing free, unrestricted flow in the reverse direction (from Port 2 to Port 1) via the check valve.

Q2: What does the "Z2FS16-8-3X/S" product code indicate?

A:​ This is a detailed product identifier:

• Z2FS:​ The product family, indicating a high-pressure throttle valve with check function.

• 16:​ The nominal size is NG16, corresponding to a larger flow capacity.

• 8:​ Denotes a specific spool design and flow capacity version within the NG16 series.

• 3X:​ Specifies the subplate mounting interface standard (ISO 4401).

• /S:​ Indicates a specific variant, often related to seal material or minor design revisions. The standard seal is typically FKM. Refer to the datasheet for the exact specification of the "/S" variant.

Q3: What is the maximum system pressure for this valve?

A:​ The valve is rated for a maximum operating pressure of 315 bar.

Q4: How is the flow setting adjusted and secured?

A:​ Flow is adjusted by turning the handwheel​ to vary the orifice size. Once the desired flow/speed is achieved, the separate locking nut​ on the spindle must be tightened against the housing to prevent the setting from changing due to vibration or accidental contact.

Q5: How does the flow direction work?

A:

• Throttled Direction:​ Flow entering at Port 1 (P)​ and exiting at Port 2 (A)​ is metered (restricted).

• Free-Flow Direction:​ Flow entering at Port 2 (A)​ pushes open the integrated check valve, allowing it to return to Port 1 (P)​ with minimal restriction.

Q6: What is the approximate maximum flow capacity?

A:​ The NG16 size provides a higher flow capacity. The typical maximum flow is approximately 100 liters per minute, depending on the specific adjustment and the pressure drop across the valve. For precise performance, consult the flow vs. pressure drop (Δp-Q) curves in the datasheet.