SUN NF Series Relief Valve | NFDC-LAN | NFCC-LCN | NFBC-LCN | Balanced Piston Cartridge Valve

NF Series Pilot-operated Balanced Piston Relief Cartridge Valves

Product Overview:

The SUN NF Series consists of 2-port, pilot-operated balanced piston pressure relief valves, engineered for primary circuit pressure regulation and overload protection in hydraulic systems. Due to their unique balanced piston architecture, these valves maintain an exceptionally low pressure rise even when bypassing high flow rates near the setpoint, preventing system overheating and protecting sensitive hydraulic components. From the standard NFDC-LAN to the high-pressure NFEC-LEN, this series is renowned for its outstanding repeatability and extended industrial service life.

Featured models include: NFDC-LAN, NFCC-LCN, NFBC-LCN, and NFEC-LEN.

Key Technical Advantages:

• Superior Regulation Linearity: The balanced piston design significantly minimizes the impact of flow fluctuations on set pressure, ensuring stable system pressure under complex conditions.

• High Response & Low Shock: The pilot-operated structure provides instantaneous relief response while maintaining excellent buffering during closure to reduce hydraulic water hammer.

• All-Steel Hardened Internals: Critical control components are heat-treated and precision-ground to maintain superior sealing and performance over millions of high-pressure cycles.

• Compact Cartridge Format: Fits standard SUN-style cavities, enabling simplified installation and optimizing internal space within integrated manifolds.

Detailed Specifications & Parameters:

• Featured Model Matrix:

  • NFDC-LAN: Size T-10A, flow capacity up to 95 L/min, A-range adjustment ($7 – 210\text{ Bar}$).

  • NFCC-LCN: Size T-10A, flow capacity approx. 60 L/min, C-range adjustment ($10 – 420\text{ Bar}$).

  • NFBC-LCN: Optimized relief module for low-to-medium flow, providing high tuning precision.

  • NFEC-LEN: Size T-3A, large flow capacity designed for high-pressure circuit regulation.

• Core Technical Specs:

  • Max Operating Pressure: Rated up to 350 Bar (5000 PSI).

  • Max Relief Flow: Covers $30\text{ L/min}$ to $120\text{ L/min}$ depending on the model.

  • Adjustment Type: L type manual hex screw adjustment; handknob options available.

  • Seals: N (Buna-N) standard; V (Viton/FKM) optional.