R900517812 Z2FS10-5-3X/V Rexroth high-pressure throttle check valve

FAQ: R900517812 Z2FS10-5-3X/V High-Pressure Throttle Check Valve

Q1: What is the primary function of this valve, and how is it different from a flow control valve?

A:​ This valve is an adjustable throttle valve with an integrated check valve. Its primary function is to provide a variable, manually-set restriction​ to flow in one direction, allowing precise speed control of an actuator. Flow in the reverse direction is free via the check valve. The key difference from a "flow control valve" is that it is not pressure-compensated; the flow rate through the throttle will vary if the system pressure changes.

Q2: What does the model code "Z2FS10-5-3X/V" mean?

A:​ It is a standard product designation:

• Z2FS:​ Identifies the product family as a high-pressure throttle valve with check function.

• 10:​ Indicates the nominal size is NG10 (CETOP RP 121 H).

• 5:​ Specifies the spool/control edge configuration.

• 3X:​ Denotes the subplate mounting interface according to ISO 4401-03-02-0-05.

• V:​ Indicates the standard seal material, which is FKM (Viton).

Q3: What is the maximum pressure this valve can handle?

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

Q4: How do I adjust the flow setting, and can it drift?

A:​ The flow is adjusted by turning the handwheel. A fine thread allows for precise setting. Once set, the integrated locking nut​ should be tightened to prevent the setting from shifting due to vibration. While the locking nut provides good security, as a non-pressure-compensated valve, the actual flow will still be affected by changes in system load pressure.

Q5: In a circuit, which port is the inlet for the throttled flow?

A:​ For the throttling function, the flow is restricted when it enters at port A​ (or P1) and exits at port B​ (or A1). The integrated check valve allows free flow from port B to port A.