Description
Product Overview
The needle valve assembly is installed inside the electronic fuel injector. The needle valve moves up and down under the action of electromagnetic force and spring elasticity, precisely controlling the timing and volume of high-pressure fuel injection. The guide sleeve constrains the movement trajectory of the needle valve and maintains a micron-level precise sealing gap. Under long-term conditions of thousands of bar high-pressure fuel flushing, impurities from diesel particles wear, and continuous high-temperature vibration in the engine compartment, scratches appear on the sealing surfaces of the needle valve and the sleeve, causing fuel leakage, coarse atomization particles, and rapid pressure relief in the common rail pipe after engine shutdown. The equipment requires multiple ignitions to start, lacks power in a single cylinder, and has difficulty climbing slopes. This product has standardized outer diameter dimensions, needle valve stroke, and sleeve inner hole tolerances. After disassembling the fuel injector, the needle valve and sleeve can be replaced as a set to repair the failure of fuel injection. It is suitable for large-scale mining excavators, heavy-duty loaders, long-distance heavy trucks, and heavy-duty electronic common rail diesel engines for maintenance and maintenance of large-scale electric control common rail diesel engines.
Core Advantages of the Single Product
Quenched and tempered alloy steel is integrated, with high hardness and wear resistance against flushing
The needle valve and sleeve are all processed from high-temperature quenched and hardened alloy steel, with wear-resistant surface treatment. They are not prone to scratches under long-term high-pressure fuel and impurity particle flushing, maintaining precise sealing gaps for a long time, and preventing fuel leakage and pressure relief.
Integrated buffer spring structure, smooth and no jamming during opening and closing
The middle section of the needle valve is equipped with a precision buffer spring, with uniform and stable elasticity, synchronous response to electromagnetic signals, smooth needle valve lifting and lowering without jamming, precise injection timing, and elimination of idle speed wobble and acceleration power jolt.
Hollow mirror surface precision inner hole of the sleeve, precise coaxial guidance and limit positioning
The entire inner hole of the guide sleeve is micro-metric mirror surface grinding, with smooth inner walls without burrs, and a stepped limit structure constrains the radial offset of the needle valve, ensuring coaxiality of the reciprocating motion and avoiding unilateral wear that causes sealing failure.
Laser-etched identification code on the outer wall for quick specification identification during storage and maintenance
The outer wall of the sleeve is engraved with a unique part code, resistant to diesel soaking and repeated wiping without fading the characters. During maintenance and on-site disassembly and assembly, it can quickly match the model, eliminating incorrect installation that causes abnormal fuel injection faults.
Paired grinding for each set, no need for secondary manual grinding and matching
Each set of needle valve and sleeve adopts a one-to-one paired mirror grinding process, with high sealing fit, completely blocking fuel reflux in the closed state, and restoring the standard fuel injection atomization effect after assembly, eliminating the need for manual grinding and debugging procedures.
Sealed and matched detection of each piece as a set, uniform and stable parameters of the same batch
Each set of components is independently tested for pressurization duration, fuel injection flow, and uniformity of atomization during assembly. The factory performance parameters are consistent, and after replacement, the fuel supply of each cylinder of the engine is balanced, with smooth operation without vibration.
Component List
28350411-12B1 Complete set of needle valve assembly (with 1 spring needle valve + 1 guide sleeve) sealed packaging
Application Scenarios
Suitable for large-scale mining excavators, heavy-duty wheel loaders, long-distance heavy trucks, and large power fixed diesel generators with high-pressure common rail fuel supply systems, suitable for 24-hour continuous heavy-duty operations in mines, long-distance freight transportation, hot and dusty construction sites, and environments with impure diesel corrosion of heavy-duty electric control common rail diesel engine fuel injectors.
Product Basic Parameters
Product Name: 28350411-12B1 Injector Needle Valve Guide Assembly Kit
Part Number: 28350411-12B1
Main Materials: Quenched and tempered alloy steel (needle valve, sleeve), stainless steel buffer spring
Structural Features: Segmented stepped needle valve with buffer spring, hollow mirror surface grinding guide sleeve, outer wall laser-etched identification code, paired matching sealing surfaces
Operating Conditions: High-pressure fuel opening and closing, alternating cold and hot engine compartments, heavy-duty electric control common rail diesel engine fuel injector core components
Product Status: Complete set of new needle valve assemblies, factory completed with calibration and detection of assembly clearance, high-pressure pressurization, and uniform atomization flow. Packaging: Each package is vacuum-sealed in a plastic bag, which isolates dust and oil. It is protected by a hard tube to provide cushioning and protection, preventing the mirror surface and sealing working surface from being scratched during transportation. It supports single-set retail and bulk purchase of entire bags, and is suitable for cross-border small package logistics.
