CAT 511-7975 High-Pressure Fuel Pump – Flow Stability and Pressure Wave Damping for C13/C15 Common-Rail Systems
1. Product:511-7975
2. Compatible Equipment: Diesel Fuel Injection Systems
3. Manufacturer: Aftermarket OEM Replacement
4. Condition: Brand New, Fully Tested
5. Origin: ABOSEDE Diesel
6. Shipping period: 3-5 business days
7. Payment terms: T/T, Western Union, PayPal
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Product Introduction
In the common-rail system, the high-pressure pump and the injectors are connected hydraulically through the rail, but this connection is not passive-the pump's output characteristics actively influence the injector's performance. When the pump delivers fuel with uneven flow, pressure waves are generated that travel through the rail and reach the injectors. These waves can cause the injector's needle to move slightly, altering the fuel quantity delivered for a given pulse width. The CAT 511-7975 addresses this through a flow-stabilised design that combines a three-plunger radial architecture with an integrated pressure-wave damper. The result is a pump that delivers a consistent flow with minimal ripple, providing a stable rail pressure baseline for the injectors to operate from.
Flow Stability – The Foundation of Consistent Injection
The 511-7975 uses a cam-driven radial three-plunger design with plungers spaced at 120° intervals, providing overlapping pressure strokes that minimise the flow interruption between plunger events. The flow ripple is measured at 3.8% at full load-a 40% improvement over two-plunger designs. The pump's volumetric efficiency is rated at 91%, meaning that 91% of the theoretical displacement is delivered to the rail, with the remaining 9% accounted for by internal leakage and compressibility. The integrated pressure-wave damper, located at the pump outlet, absorbs the high-frequency pressure pulses that would otherwise propagate to the rail, reducing the rail pressure ripple by an additional 30%.
Material Durability – Engineered for Heavy-Duty Applications
The 511-7975's plungers and barrels are manufactured from a nitride-hardened steel with a surface hardness of 1,100 HV and a case depth of 0.025 mm, providing resistance to the abrasive wear that increases internal leakage and reduces volumetric efficiency. The cam and camshaft are constructed from a case-hardened alloy steel with a hardness of 58 HRC, providing resistance to the high-contact stresses of the plunger-cam interface. The pump housing is made from ductile iron with a corrosion-resistant coating, providing protection in off-highway environments.