SUN RD Series Relief Valve | RDBA-LAN | RDDA-LAN | RDFA-LAN | RDJA-LAN

SUN RD Series Pilot-Operated Pressure Relief Cartridge Valves

Product Overview:

The SUN RD Series consists of 2-port, pilot-operated pressure relief valves engineered for precise pressure regulation and overload protection in hydraulic systems. Due to their pilot-operated architecture, these valves maintain exceptionally high accuracy and minimal pressure rise even during significant flow fluctuations. From the standard RDBA-LAN to the handknob-equipped RDBA-LWN, the series offers outstanding repeatability and contamination tolerance, making it a staple in industrial power units, mobile machinery, and custom manifold blocks.

Featured models on this page: RDBA-LAN, RDDA-LAN, RDFA-LAN, RDJA-LAN, and RDBA-LWN.

Key Technical Advantages:

• Superior Pressure Stability: The pilot-operated design ensures consistent action when approaching the set pressure, significantly dampening hydraulic shock.

• Low Hysteresis Performance: Hardened spools matched with precision-rated springs ensure excellent linearity during both pressure rise and fall.

• Versatile Adjustment Options: Available with L (standard hex screw), W (handknob), and K (capped) suffixes to suit various operational environments.

• Compact Cartridge Format: Fits standard SUN T-10A or T-3A cavities, enabling rapid integration into manifolds while reducing system footprint and leak points.

Detailed Specifications & Parameters:

• Featured Model Matrix:

  • RDBA-LAN: Size T-10A, flow up to $95\text{ L/min}$, with “A” range adjustment (e.g., $7-210\text{ Bar}$).

  • RDDA-LAN: Size T-3A, optimized for medium flow applications up to $200\text{ L/min}$.

  • RDFA-LAN: Large flow relief valve designed for high-power hydraulic circuits.

  • RDJA-LAN: High-capacity model supporting flow rates up to $400\text{ L/min}$.

  • RDBA-LWN: Features the W handknob for convenient on-site pressure setting.

• Core Technical Specs:

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

  • Adjustment Ranges: Suffix A covers $7 – 210\text{ Bar}$, Suffix B covers $3.5 – 105\text{ Bar}$, etc.

  • Fluid Media: Mineral hydraulic oil; recommended filtration at $10\text{ μm}$ or better.

  • Seals: N (Buna-N) standard; V (Viton/FKM) available for high-temperature fluids.