The 2FRM 16 series represents a 2-way flow control valve designed for pressure- and temperature-compensated flow regulation, typically utilized in hydraulic circuits where load-independent velocity control of actuators is required. Engineered to interface with standard subplates per ISO 4401-07-06-0-05, this valve employs a pressure-compensator spool to maintain a constant pressure differential across the throttle orifice, effectively neutralizing fluctuations in supply pressure or downstream load resistance. The integration of a temperature-compensating needle minimizes viscosity-related flow variations, ensuring repeatable performance across varying duty cycles. Given its function as a precision metering component, the 2FRM 16 is susceptible to spool silting and orifice clogging, necessitating strict adherence to fluid cleanliness protocols to maintain laminar flow characteristics and prevent hysteresis in the compensator spool.
For complete selection guidelines and cross-reference documentation on this product line, please consult our Rexroth equivalent hydraulic valves guide.
Technical Specifications and Performance Parameters
The following table outlines the critical operating parameters for the 2FRM 16 series, ensuring compatibility with standard industrial hydraulic power units.
| Parameter | Specification |
|---|---|
| Mounting Interface | ISO 4401-07-06-0-05 (DIN 24340 Form A16) |
| Maximum Operating Pressure | 315 bar (4568 psi) |
| Maximum Flow Capacity | 160 L/min |
| Fluid Temperature Range | -20°C to +80°C |
| Viscosity Range | 10 to 800 mm²/s |
| Hysteresis | < 2% of maximum flow |
Fluid Cleanliness and Contamination Control
The operational longevity of the 2FRM 16 is fundamentally linked to the cleanliness of the hydraulic medium. Due to the tight tolerances between the pressure-compensator spool and the valve body, particulate matter can induce spool sticking or erratic flow regulation. To ensure compliance with manufacturer specifications and to prevent premature wear of the metering orifice, the system must maintain an ISO 4406 cleanliness class of at least 18/16/13.
Filtration systems should be sized to handle the flow rate of the circuit, with beta ratios (βx) of at least 75 for the specified micron rating. In systems prone to high-frequency pressure spikes, the use of high-pressure filters is recommended to protect the valve internals from cavitation-induced erosion and particulate ingress.
Seal Elastomer Compatibility
The 2FRM 16 is supplied with specific seal configurations to ensure chemical compatibility with various hydraulic fluids. The selection of the elastomer is critical to preventing leakage and maintaining the integrity of the internal pressure chambers.
- NBR (Nitrile Butadiene Rubber): Standard for mineral oil-based fluids (HLP/HLPD). These seals provide excellent resistance to petroleum-based oils but are unsuitable for phosphate ester-based fire-resistant fluids.
- FKM (Viton): Recommended for applications involving high temperatures or synthetic fire-resistant fluids (HFD). FKM exhibits superior thermal stability and chemical resistance compared to NBR, though it requires careful monitoring to ensure no degradation occurs when switching fluid types.
Installation and Maintenance Considerations
Adherence to ISO 1219-1 symbology is required during circuit design to ensure the pressure compensator is correctly oriented relative to the throttle. When mounting the valve to the subplate, torque specifications must be strictly followed to prevent body distortion, which can lead to binding of the compensator spool. Maintenance intervals should include periodic inspection of the needle adjustment mechanism and verification of the compensator spool’s free movement. If the valve exhibits signs of “stick-slip” or flow drift, the internal spool should be inspected for varnish buildup or silting, which often indicates the need for improved fluid filtration or oil conditioning.