Fuel Injector

Fuel Injector Complete

MAN B&W 7S26MC
MAN B&W 7S26MC-MK6-Fuel Injector Complete Supplier
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Description

MAN B&W 7S26MC-MK6 - Fuel Injector (Complete Unit)

1. General Description:
The fuel injector is a critical component of the MAN B&W S26MC series marine diesel engine. Its primary function is to atomize and inject a precise amount of heavy fuel oil (HFO) or marine diesel oil (MDO) directly into the engine's combustion chamber at extremely high pressure. This ensures efficient and clean combustion, which is essential for optimal engine performance, fuel economy, and compliance with emissions regulations.

2. Key Components:
A complete fuel injector typically consists of two main parts:

  • Injector Holder / Body: The robust outer body that houses the internal components and connects the injector to the engine cylinder head. It contains the fuel channels and the actuating mechanism.

  • Nozzle Assembly: The precision-engineered tip of the injector, featuring small holes (orifices) through which fuel is sprayed. The nozzle is designed to create a fine, conical spray pattern ideal for the engine's combustion chamber shape.

3. Main Features & Design (Specific to MC/MK6 Series):

  • Hydraulically Actuated: The injector is opened by high fuel oil pressure supplied from the engine's fuel pumps, and closed by a spring.

  • Cooled Design: It incorporates a cooling circuit (using fresh water or coolant) to manage the extreme thermal loads from combustion and prevent coking of the fuel inside the nozzle.

  • Durable Materials: Constructed from special heat-resistant and wear-resistant steels to withstand high pressures (typically over 600 bar) and corrosive heavy fuel oil.

  • "MC"Designation: Indicates it is designed for the mechanically controlled (camshaft-driven) generation of MAN B&W engines, which the MK6 version represents a refined, later evolution of.

  • Precision Matched: The nozzle orifices are meticulously calibrated to match the specific engine type (7S26MC) for optimal performance.

4. Primary Function:
To deliver the correct quantity of fuel at the exact right moment, in a perfectly atomized state, for efficient and complete combustion within the engine cylinder.