Description
Product Overview
The needle valve sleeve is assembled inside the injector and provides a reciprocating motion guidance and constraint for the needle valve. The hollow inner hole serves as the fuel flow channel, and the high-precision fit gap controls the fuel leakage volume. Under long-term high-pressure fuel flushing at over 1000 bar, abrasive diesel particles from impurities, as well as alternating hot and cold conditions in the engine compartment, can cause scratches on the inner wall of the sleeve and a loss of roundness in the hole diameter, which can lead to needle valve sticking during up and down movement, poor sealing, imbalance in fuel injection volume, coarse atomization, rapid pressure relief in the fuel system after engine shutdown, and excessive black smoke in the exhaust. This product has unified standard dimensions for the outer diameter, inner hole tolerance, and step limit height. After disassembling the injector, the sleeve can be replaced alone to repair the failure of fuel injection. It is suitable for the maintenance of electronic common rail fuel injectors for construction machinery, heavy-duty trucks, and light-duty diesel vehicles.
Core advantages of this product:
The quenched and tempered alloy steel is formed as a single piece, which is wear-resistant, pressure-resistant, and does not deform.
The entire steel is treated with high-temperature quenching and hardening, resulting in high hardness. It can withstand the reciprocating friction of the needle valve and the impact of high-pressure fuel for a long time, and the inner wall is less likely to develop scratches or deform, maintaining a precise fit gap for a long time.
The segmented step limitation steps ensure precise assembly and no offset.
The sleeve body comes with an integrated limit step, which precisely limits and fixes after being installed in the injector housing, without any axial or radial displacement, ensuring the coaxiality of the needle valve movement and preventing injection sequence disorder.
The hollow and continuous high-precision inner hole is mirror-polished without burrs.
The inner hole is fully mirror-polished, with a smooth inner wall without processing burrs, resulting in low fuel flow resistance and reducing friction resistance during the needle valve movement, preventing the needle valve from getting stuck and ensuring slow and responsive opening and closing.
The unified standard tolerance for the outer diameter ensures easy disassembly and assembly without any jamming.
The tolerance of the outer diameter of the sleeve is extremely small, and it fits well with the injector housing by interference fit. The disassembly and assembly process is smooth, eliminating the need for on-site grinding and re-drilling, significantly reducing the maintenance time.
The smooth transition structure at both ends reduces fuel vortex wear.
The arc transition design at both ends of the sleeve reduces vortex wear caused by high-pressure fuel impact at high speed, delays inner wall wear, and extends the service life of the sleeve.
Each sleeve is independently dimensionally precisely inspected, and no secondary fitting and grinding are required for assembly.
Each sleeve is individually tested for coaxiality of the inner hole, inner wall smoothness, and hardness. The factory parameters are unified, allowing for direct matching with the corresponding specification needle valve, and the assembly restores the standard fuel injection performance.
Accessory list:
093152-0320 Needle Valve Sleeve (Multiple Sealed Bags) Applicable scenarios
It is suitable for large-scale mining excavators with high-pressure common rail fuel supply system, heavy-duty wheel loaders, long-distance heavy-duty freight trucks, light-duty pickups, and small diesel generator sets. It is applicable for various scenarios such as continuous heavy-duty mining, short-distance urban freight transportation, construction site high-temperature dust and impurity diesel corrosion environments, and the replacement of internal guide components of various electronically controlled common rail diesel engine fuel injectors.
Product Basic Parameters
Product Name: 093152-0320 Fuel Injector Needle Valve Sleeve
Part Number: 093152-0320
Main Material: Tempered and hardened alloy steel
Structural Feature: Segmented stepped cylinder body, hollow through-hole precision inner hole, mirror-finished inner and outer walls, limit step structure
Application Conditions: Ultra-high oil pressure reciprocating guidance, engine compartment alternating cold and hot vibrations, various impurity diesel corrosion of various electronically controlled common rail diesel engine fuel injectors internal components
Product Status: New and complete sleeve component, factory completed with internal hole accuracy, wear-resistant pressure-bearing, and coaxiality full calibration and inspection
Packaging: Sealed plastic bag batch packaging, each unit isolated from dust, avoiding transportation impact and scratching of the precision inner hole working surface, supporting small-scale retail, bulk purchase in bags, and compatible with cross-border small package logistics.
