High Quality Delivery Valve VE4 Diesel Engine Spare Parts

As a core control element in high-pressure fuel systems, the delivery valve's dynamic response directly determines injection pressure stability and combustion efficiency. This article, combining the latest structural optimization results and standardization progress, explains its pressure control mechanism, failure prevention technology, and intelligent development direction, providing support for the upgrade of high-pressure common rail systems.

I. Structural Innovation and Pressure Control Mechanism
Modern delivery valves utilize a composite "sealing cone - pressure relief ring - guide groove" structure: the sealing cone achieves a 220MPa high-pressure seal, while the pressure relief ring (with a clearance of 0.002-0.005mm) stabilizes the residual pressure at 10-15MPa through volume changes, preventing injector leakage. Recent CFD simulation optimization shows that adding a 0.5mm deep groove to the sealing surface can reduce the bubble burst pressure from 140MPa to 10MPa. Combined with a 4mm φ connecting hole, the opening and closing response speed is improved by 15%, effectively suppressing cavitation.​

II. Failure Mechanisms and Multi-Dimensional Protection System

Cavitation and fatigue fracture are the primary failure modes: microjets generated by the collapse of fuel bubbles on the sealing surface can cause honeycomb erosion, while high-frequency impact at 3000 rpm can easily lead to fractures at stress concentration points on the guide sleeve. Protection technologies include: a BN-SiN composite ceramic coating (3μm thick) that increases wear resistance by fourfold; 860°C oil-quenching of silicon-chromium spring steel (60Si2CrA) to increase the fatigue limit to 1800 MPa; and 100,000 pulse pressure cycle tests as specified in ISO 12156-1:2023 to ensure leakage-free failure.

III. Standardization Progress and Intelligent Upgrade Trends

The new GB/T 5771-2025 standard strengthens cleanliness requirements (impurity weight ≤ 7.5 mg) and opening pressure accuracy (7.6-7.9 MPa). The introduction of a flangeless structure reduces flow control deviation to ±2%. The intelligent oil delivery valve integrates a micro pressure sensor and RFID tag. The ECU adjusts the spring preload in real time, and the drain/supply valve dynamically compensates for pressure fluctuations. Tests in a single-unit power generation system have shown it can reduce fuel consumption by 3.2%. In the future, multi-porous coordinated control structures capable of ultra-high pressures of 3000 bar will become a key technology node for meeting China VII emission standards.