Rexroth FD Series Balancing Valve | FD16FA FD25FA FD32FB | Hydraulic Counterbalance Valve | Load Holding Control

FD Series Hydraulic Balancing & Counterbalance Valves

Product Overview: The FD series balancing valves are specifically engineered to meet the stringent requirements of load control in mobile machinery and industrial applications. Primarily installed in the return line of hydraulic actuators (cylinders or motors), these valves balance external loads by controlling return flow, effectively preventing uncontrolled movement caused by overrunning loads. Spanning sizes from Size 12 to Size 32, the FD series offers compact subplate or pipe mounting, ensuring maximum operational safety under extreme high-pressure conditions.

Featured models: FD16FA/30B06/2, FD32FA-2X/B06V, FD25FA-2X/B06V, and FD32FB21/400B06V-078.

Key Technical Advantages:

• Precise Load Sensing: Utilizes pilot-operated control for smooth opening and closing, eliminating chatter and vibrations during the lowering process.

• Zero-Leakage Holding: Precision-ground poppet seals provide reliable static locking when inactive, ensuring loads remain in position for extended periods.

• Integrated Relief Protection: Features secondary pressure protection to safeguard the system against instantaneous high pressure caused by external impacts or thermal expansion.

• Viton Seals (V): Models with the B06V suffix come standard with FKM (Viton) seals, offering superior high-temperature resistance and chemical compatibility.

Detailed Specifications & Parameters:

• Featured Model Matrix:

  • FD16FA / FD25FA: Sizes 16/25, subplate mounting, ideal for medium-to-high flow load control applications.

  • FD32FA-2X / FD32FB: Size 32, Series 2X design, catering to ultra-high flow requirements.

  • FD32FB21/400B06V-078: Advanced version with a pressure range up to 400 bar and specialized flow throttling.

• Core Technical Specs:

  • Max Operating Pressure: Up to 35 MPa (350 bar) or 42 MPa (420 bar).

  • Max Flow Capacity: Ranges from 80 L/min (Size 12) to 560 L/min (Size 32).

  • Pilot Ratio: Available from 1:3 to 1:4.5 for adjustable opening characteristics.

  • Mounting Standard: Complies with ISO 5781 mounting interface.