High Quality Delivery Valve F802 Diesel Engine Spare Parts

Abstract
In compact high-pressure plunger pumps, the delivery valve plays a crucial role in controlling the discharge flow rate and stabilizing pressure pulsation. Poor valve design can lead to hydraulic losses, pressure fluctuations, and noise, reducing the pump’s efficiency and durability. This study focuses on the structural optimization and experimental verification of a delivery valve designed for small high-pressure plunger pumps. The effects of valve geometry, spring stiffness, and flow passage configuration on dynamic performance were investigated through numerical simulation and prototype testing.

1. Introduction
Miniaturized high-pressure plunger pumps are increasingly used in automotive fuel systems, precision hydraulic control, and portable fluid equipment. However, due to limited installation space, the valve assembly must balance compactness with high flow efficiency and fast dynamic response. Conventional delivery valves often suffer from flow-induced oscillations and delayed closing, which generate pressure pulsation and reduce volumetric efficiency. Therefore, optimizing the valve structure is critical for achieving stable flow delivery and low noise operation in compact pump systems.

2. Methodology and Modeling
A three-dimensional Computational Fluid Dynamics (CFD) model was established to simulate the internal transient flow characteristics of the delivery valve during opening and closing cycles. The fluid–structure interaction (FSI) method was applied to capture the coupled motion of the valve plate and spring under varying pressure conditions. Key parameters investigated include:

• Valve seat cone angle (30°–45°)

• Flow passage diameter (1.5–2.5 mm)

• Spring stiffness (8–12 N/mm)
  The optimization objective was to minimize flow-induced pressure loss and valve closing delay while ensuring sufficient sealing force.

3. Optimization Results
Simulation results revealed that:

• A cone angle of 38° provided the best compromise between flow smoothness and sealing capability.

• Enlarging the flow passage from 1.8 mm to 2.2 mm reduced peak pressure loss by 12%, while maintaining acceptable structural strength.

• Reducing spring stiffness by 10% improved valve response time and decreased pressure pulsation amplitude by 15%.
  Flow streamlines showed a more uniform velocity distribution and reduced vortex formation in the optimized design, indicating enhanced flow stability.

4. Experimental Verification
Prototype valves were fabricated based on the optimized parameters and tested on a plunger pump bench operating at 100–250 MPa. The experimental results confirmed the numerical predictions:

• Average discharge pressure fluctuation decreased from 6.5% to 3.8%.

• Overall volumetric efficiency improved by 4.2%.

• Acoustic noise level was reduced by 2.5 dB, demonstrating improved hydraulic stability.
  High-speed camera observation validated that valve closing time shortened by approximately 0.3 ms, effectively preventing backflow and secondary impacts.

5. Conclusion
The structural optimization of the delivery valve significantly improved the dynamic stability and flow performance of a compact high-pressure plunger pump. By refining the valve geometry, spring stiffness, and flow passage design, pressure pulsation and energy losses were effectively reduced. The experimental verification aligned well with CFD simulations, confirming the reliability of the optimization approach. Future work will focus on advanced materials and adaptive damping structures to further enhance fatigue resistance and durability in next-generation high-pressure pump systems.