R900564522 Z2SFK10-2-1X/2QV Rexroth dual one-way throttle valve

FAQ: R900564522 Z2SFK10-2-1X/2QV Dual One-Way Throttle Valve

Q1: What is the primary function of this valve?

A:​ It is a dual-unit adjustable throttle valve that meters hydraulic flow in one direction only. Each of its two independent elements allows free, unrestricted flow in the opposite direction, acting as a check valve. It is typically used to independently control the speed of an actuator, such as a cylinder, in both extension and retraction.

Q2: What does the part number "Z2SFK10-2-1X/2QV" signify?

A:​ This is a standard product code for this type of component:

• Z2SFK:​ Designates the base model as a dual one-way throttle valve.

• 10:​ Indicates the nominal size is NG10 (CETOP 5).

• 2:​ Denotes a specific version or spool configuration.

• 1X:​ Specifies the subplate port pattern according to ISO 4401.

• 2QV:​ Indicates the sealing and material variant, typically signifying standard FKM/Viton seals for use with common hydraulic oils.

Q3: What is the maximum operating pressure?

A:​ The maximum allowable operating pressure is 315 bar.

Q4: How is the flow rate adjusted?

A:​ The flow is adjusted manually via a handwheel on each of the two throttle elements. Rotating the handwheel changes the orifice opening. A locking ring on the handwheel can be tightened to secure the selected setting and prevent unintended changes caused by vibration.

Q5: In which direction does the valve throttle flow?

A:​ The valve throttles flow in the direction from port A to port B​ (and similarly from port C to port D) for each element. Flow in the reverse direction (from B to A or D to C) is free, with only a minimal pressure drop from the integrated check valve.

Q6: What is the typical flow range?

A:​ The flow capacity depends on the specific setting and system pressure drop. For an NG10 size valve, the maximum flow capacity is typically in the range of 40 to 60 liters per minute. For precise performance data and flow curves, please consult the official technical datasheet for this product series.

Q7: What type of hydraulic fluid is compatible?

A:​ The valve is designed for use with standard mineral-based hydraulic oils conforming to ISO 11158 (e.g., HLP types). With the standard FKM (Viton) seals, it is also compatible with many HFD and HFA/E fluids. Always verify seal material compatibility when using special fluids.

Q8: What are the system cleanliness requirements?

A:​ To ensure reliable operation and longevity, the hydraulic fluid should meet a minimum cleanliness level of NAS 1638 Class 8​ or ISO 4406 18/16/13. Installing a pressure filter upstream of the valve is strongly recommended.

Q9: Can this valve be used to hold a load in position?

A:​ No.​ While the integrated check valve prevents backflow, this component is not designed as a load-holding device. Its primary function is flow control for speed regulation. For holding a load stationary, a dedicated counterbalance valve or pilot-operated check valve must be used in the circuit.

Q10: Where is this valve commonly applied?

A:​ It is frequently used in hydraulic circuits that require independent speed control for both directions of an actuator. Common applications include:

• Presses (for molding, stamping)

• Injection molding machines

• Machine tools

• Various types of industrial machinery where adjustable meter-in or meter-out control is necessary.