Description
Product Overview
The needle valve assembly is located at the front end of the electronically controlled fuel injector. It is driven to reciprocate up and down by an electromagnetic signal, precisely controlling the timing and volume of fuel injection. The high-pressure fuel passes through the front micro-hole to form a uniform oil mist and is sent into the cylinder for combustion. Under long-term conditions of thousands of bar of high-pressure fuel flushing, wear caused by impurities in diesel particles, and continuous high-temperature vibration in the engine compartment, scratches occur on the sealing surface between the needle valve and the sleeve, and the clearance increases. This leads to fuel leakage, coarse atomization particles, rapid loss of track pressure after engine shutdown, and multiple attempts to ignite before the equipment can start, lack of power in a single cylinder, and weak climbing power. This product has standardized dimensions for the outer diameter, needle valve stroke, and sleeve inner hole tolerance. 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 mining excavators, heavy-duty wheeled loaders, and long-distance heavy-duty freight trucks for the maintenance and repair of electronically controlled common rail diesel engines.
Core Advantages of the Single Product
Integrated processing of quenched and tempered alloy steel with high hardness, resistant to high-pressure flushing and wear
Both the needle valve and the sleeve are subjected to high-temperature quenching and hardening treatment. The overall surface has a mirror-like wear-resistant strengthening layer, which can withstand extremely high pressure fuel and impurity particles without generating scratches or deformation of the hole diameter, maintaining a micron-level precise sealing gap for a long time, and preventing internal fuel pressure leakage.
Multi-stage stepped limit sleeve, constraining the needle valve movement without radial offset or jamming
The internal multi-stage stepped limit structure of the sleeve precisely limits the reciprocating motion trajectory of the needle valve, eliminating radial eccentric shaking, ensuring the needle valve to rise and fall in a coaxial manner throughout the process, and avoiding local wear on one side causing sealing failure and needle valve jamming.
Extended segmented precision needle valve, smooth opening and closing with no delay
The extended segmented needle valve is mirror-polished throughout, without burrs or protrusions, with low friction resistance during opening and closing, synchronous and rapid response to the electromagnetic signal, eliminating fuel injection lag, idle wobble, and acceleration power jolts.
Laser-engraved model code on the outer wall for quick matching during storage and maintenance
The outer side of the sleeve body is engraved with the exclusive model identifier L399TBE, which is resistant to long-term exposure to diesel and repeated wiping without fading the characters. During inventory storage and on-site disassembly and assembly, it can quickly distinguish specifications and prevent incorrect installation from causing abnormal atomization and unstable track pressure faults.
One-to-one matching mirror grinding, complete locking of the fuel to prevent leakage
Each set of needle valve and sleeve adopts a precise one-to-one mirror grinding process, ensuring a tight and complete seal in the closed state, preventing fuel reflux, and eliminating dripping and leakage after engine shutdown, reducing carbon accumulation in the cylinder, and lowering exhaust black smoke emissions.
Independent independent atomization flow calibration at the factory, no manual grinding and adjustment required for assembly
Each set of components is independently tested during high-pressure pressurization, checking the uniformity of fuel atomization, standard fuel injection flow, and factory performance parameters are unified. Direct replacement and assembly can restore the standard fuel atomization effect of the engine, eliminating the need for manual grinding and adjustment procedures. List of Accessories
L399TBE Complete Needle Valve Coupling Set (1 piece of multi-stage stepped guide sleeve + 1 extended segmented precision needle valve) for vacuum sealing and independent packaging
Application scenarios
Suitable for large mining excavators with high-pressure common rail fuel supply systems, heavy-duty wheeled loaders, long-distance heavy-duty freight trucks, high-power fixed diesel generator sets. Suitable for heavy-duty electro-hydraulic common rail diesel engines operating continuously for 24 hours under heavy load conditions, long-distance trunk line freight transportation, hot and dusty construction sites, and environments with corrosive impurity diesel. It is a core component for replacing the front injection part of heavy-duty electronically controlled common rail diesel engine fuel injectors.
Product basic parameters
Product name: L399TBE Injector Needle Valve Guidance Coupling Set
Part number: L399TBE
Main material: Tempered hardened alloy steel (needle valve, stepped sleeve)
Structural features: Multi-stage stepped limit sleeve, extended segmented mirror-polished needle valve, outer wall engraved model identification code, high-precision paired sealing contact surface
Operating conditions: High-pressure fuel injection opening and closing, cabin alternating hot and cold continuous vibration, heavy-duty electro-hydraulic common rail diesel engine fuel injector atomization spray component
Product status: New complete needle valve coupling set, factory completed with calibration and testing of mating clearance, high-pressure holding pressure, and atomization flow
Packaging: Independent vacuum-sealed plastic bag packaging, isolating dust and oil, hard protective tube buffer protection to avoid scratches and damage to the mirror-sealed working surface during transportation. Supports single set retail, bulk purchase of the entire bag, and is compatible with cross-border small package logistics.
