Description
Product Overview
The overflow valve is installed at the interface of the high-pressure oil pump oil circuit. When the pipeline oil pressure exceeds the specified threshold, it automatically releases pressure and stabilizes it. At the same time, it achieves one-way cutoff by relying on the internal steel balls to prevent the backflow of high-pressure fuel. Under long-term road bumps, diesel impurities erosion, and alternating hot and cold conditions, the steel balls and valve seat sealing surfaces will wear and the pressure release threshold will shift. This may result in fluctuating rail pressure, accelerated failure, fault indicator alarms, and rapid oil circuit pressure release after engine shutdown. This product has standardized specifications for thread, pressure release pressure, and flow hole diameter. The valve body can be simply replaced for oil pressure repair during maintenance, suitable for the maintenance of light-duty diesel trucks, diesel buses, and small construction machinery common rail oil pumps.
Core Advantages of the Single Product
Stainless steel integrated valve body, resistant to oil, rust, and corrosion
Overall stainless steel precision processing, surface polishing treatment, isolating diesel vapor, cabin water vapor rusting, and long-term complex conditions are less prone to corrosion and perforation, providing long-term oil circuit sealing.
Six-angle standard assembly at the tail, easy to disassemble and assemble
Integrated six-angle limit platform, compatible with standard wrench for disassembly and assembly, uniform force, less prone to slipping and valve body deformation during the disassembly process, reducing the difficulty of maintenance operations.
Double-hole circulation design on the side walls, sensitive oil pressure pressure release response
Symmetrical circulation oil channels on both sides, smooth fuel flow, uniform pressure release speed during overpressure, quickly and stably stabilizing the common rail pipeline oil pressure, eliminating speed fluctuations and acceleration jolts.
Built-in precise steel ball one-way sealing structure, blocking fuel backflow
Quenched steel balls paired with valve seat grinding, high sealing fit, complete closure of the oil circuit in low-pressure conditions, preventing high-pressure fuel backflow and pressure release after engine shutdown, improving cold start performance.
Standard external thread installation section, strong assembly sealing, no oil leakage
Precise rolled external thread at the front end, regular tooth shape, combined with sealing gasket, tightly tightened after assembly to fill the gap, no leakage in high-pressure conditions, stable oil pump working environment.
Independent pressure calibration at the factory, no need for secondary debugging during assembly
Each valve body is individually calibrated for pressure release and opening pressure, parameters are unified, after replacement, it can directly match the original vehicle electronic control system, quickly restoring stable oil pressure conditions. Applicable scenarios
This product is suitable for light-duty freight trucks with high-pressure common rail fuel supply systems, diesel commercial buses, small wheeled construction machinery, and small stationary diesel generators. It is applicable for short-distance urban freight, agricultural operations, outdoor environments with alternating cold and heat and dust-diesel corrosion. The product is for the replacement of the pressure stabilizing components of the light-duty electronic control common rail diesel oil pump in such scenarios.
Product Basic Parameters
Product Name: 8-98074955-0 High-Pressure Unidirectional Overflow Valve Assembly
Part Number: 8-98074955-0
Main Material: Stainless steel valve body, hardened unidirectional sealing steel balls
Structural Feature: Hexagonal disassembly head, front end external thread, dual-flow oil holes on the side wall, built-in unidirectional pressure relief structure
Application Conditions: Medium-high pressure oil circuit pressure stabilization, engine compartment alternating cold and heat, diesel medium corrosion of light-duty electronic control common rail diesel engine oil pump
Product Status: New and complete overflow valve assembly, factory completed with pressure relief pressure, high-pressure sealingity, and flow rate full bench calibration and testing
Packaging: Single-piece independent transparent tube packaging, protective plug at the threaded end to avoid transportation impact and damage to the threaded and sealing working surfaces. Supports single-piece retail, bulk purchase in cartons, and is compatible with cross-border small package logistics.
