Duplomatic SCLI Series Cartridge Valve | SCLI-25321 SCLI-25377 | SC LI

LIC Hydraulic offers the Duplomatic SCLI Series, a premier line of 2-way cartridge valves designed according to ISO 7368 (DIN 24342) standards. These “Logic Valves” consist of a slip-in cartridge and a customized cover plate, allowing for maximum flexibility in hydraulic circuit design. With the ability to handle pressures up to $350\text{ bar}$ ($5000\text{ PSI}$) and massive flow volumes, models like the SCLI-25321/30 and SCLI-25377/30 are the backbone of modern heavy-duty hydraulic systems. Whether you are controlling direction, pressure, or flow in a multi-ton press, the SCLI series provides the reliability and fast response time demanded by industrial automation.

Technical Specifications (Bulleted List)

• Standard: ISO 7368 / CETOP RP 121H (Size DN 16 to DN 100).

• Max Operating Pressure: $350\text{ bar}$.

• Flow Capacity: From $200\text{ L/min}$ (DN16) up to $8000\text{ L/min}$ (DN100).

• Design: Poppet-style valve with multiple area ratios (e.g., 1:2, 1:14).

• Sealing: Available with NBR or Viton seals for varied fluid compatibility.

Key Technical Advantages

• Dynamic Response: The poppet design features low mass and short stroke lengths, enabling extremely rapid opening and closing cycles for high-speed machine operations.

• Leak-Free Seat Seal: Unlike spool valves, the SCLI cartridge uses a conical seat that provides a drop-tight seal when closed, essential for safety-critical load-holding circuits.

• Compact Integration: By integrating multiple SCLI cartridges into a single manifold block, the overall size of the hydraulic system is reduced while performance is maximized.

• High Efficiency: Streamlined internal flow paths ensure minimal pressure drops, reducing energy consumption and fluid heating in high-flow circuits.

Application Areas

• Forging & Stamping Presses: Controlling high-velocity cylinder movements and decompression cycles.

• Die-Casting Machines: Managing the high-flow logic for rapid injection and clamping.

• Shipbuilding: Heavy-duty steering gear and winch control systems.

Expert Maintenance Tips

• Pilot Line Air Purge: After a new installation, ensure all air is bled from the pilot lines of the SCLI covers. Trapped air can lead to sluggish response or “chattering” of the poppet.

• Cartridge Removal: When servicing, use a dedicated puller tool to remove the SCLI-25421/22 inserts. Never force the cartridge out with a screwdriver, as this can score the precision-honed cavity walls.

• Oil Cleanliness: Maintain a filtration level of $ISO\text{ 18/16/13}$. While poppet valves are robust, large particles can still prevent the valve from seating correctly, leading to circuit pressure loss.