The Building Blocks of Power: Unlocking High-Flow Hydraulics with LC/LFA Cartridge Valves

When designing high-flow hydraulic circuits, engineers often face a dilemma. Do you use large, heavy monoblock valves that limit design freedom, or do you build complex manifolds with countless individual components? There is a third, smarter option: the building block approach.

The Bosch Rexroth LC/LFA cartridge valve system is the cornerstone of modern, high-flow compact block design. By combining a simple, robust LC cartridge valve with a versatile LFA control cover, you can create powerful, multi-function hydraulic circuits with unparalleled flexibility and cost-effectiveness.

The Power Section: The LC Cartridge

At its core, the system starts with the LC cartridge valve. This is the "power section," a simple poppet or spool element designed to be inserted into a standardized ISO 7368 cavity in your manifold. Its job is simple: to open or close the flow path between ports A and B. But its capability is immense.

With sizes ranging from NG16 all the way to NG160, the LC cartridge can handle flows from a few liters per minute to a staggering 25,000 l/min, all while withstanding pressures up to 450 bar. This makes it the go-to solution for applications that move serious fluid, like large industrial presses, marine systems, and heavy-duty mobile machinery. Its simple, pressure-actuated design is inherently robust, ensuring a long, reliable service life.

The Intelligence: The LFA Control Cover

If the LC cartridge is the muscle, the LFA control cover is the brain. The LFA cover bolts directly over the LC cartridge, providing the pilot oil connections that dictate how the cartridge behaves. This is where the magic happens. By choosing from a vast library of LFA covers, you can transform that simple on/off element into a sophisticated control valve.

• Directional Control (LFA...WEA): Mount a standard directional spool valve (like a WE 6 or WE 10) directly onto the cover to create a high-flow, pilot-operated directional valve.
• Pressure Control (LFA...DB): Integrate a pressure relief pilot valve to turn the LC cartridge into a high-capacity system pressure relief or pressure sequence valve.
• Flow Control (LFA...H): Add a stroke limitation feature to the cover to use the LC cartridge as a simple, adjustable throttle valve.
• Check Valve Function (LFA...R/G): Use a cover with an integrated pilot control valve to allow free flow in one direction and block it in the reverse, creating a high-flow check valve.

The Power of the System: Why Modularity Wins

The LC/LFA system isn't just a collection of parts; it's a design philosophy that delivers tangible benefits.

• Reduced Complexity & Cost: Instead of piping multiple large components, you integrate functions directly into a compact manifold. This reduces potential leak points, saves space, and lowers assembly costs.
• Proven & Reliable: This is one of the most widely used and field-tested valve systems in the world. Its performance is predictable, and its reliability is unmatched.
• Unmatched Flexibility: With dozens of cover configurations, two area ratios, multiple spring cracking pressures, and a wide range of sizes, you can design the exact function you need.

The LC/LFA system proves that powerful hydraulics don’t have to be complicated. By providing the fundamental, reliable building blocks, Bosch Rexroth empowers you to design and build smarter, more efficient, and more cost-effective high-flow hydraulic systems.