Abstract:The aircraft hydraulic system plays a crucial role in controlling the movement and stability of various aircraft components. In actual use, it often encounters complex hydraulic variations. The priority valve, a type of sequential valve widely used in aircraft hydraulic systems, ensures that hydraulic pressure is prioritized for critical flight control systems when a sudden pressure drop occurs due to an increased demand for flow at the load end. The performance of the priority valve in supplementing pressure to downstream systems can be evaluated based on the outlet pressure image and the valve spool displacement vibration image. To ensure the safety and practicality of the priority valve during operation, it is necessary to study the structural parameters that affect its performance.This article first analyzes the working process of a certain type of priority valve and the causes of vibration, identifying the structural parameters that may affect its performance. Next, using hydraulic fluid simulation methods, the existing design of the priority valve is optimized, focusing primarily on the mass of the valve spool and the area of hydraulic force. By altering certain structural parameters affecting these aspects, the study analyzes the dynamic performance under the same operating conditions, examining how these changes influence the dynamic working performance of the priority valve. The results indicate that reducing the main valve spool mass decreases the amplitude of the spool during the pressure compensation phase. A smaller main valve seat orifice diameter leads to higher pressure at the load end, better pressure compensation performance, and reduced vibration amplitude. Additionally, increasing the mass of the main valve seat can reduce the amplitude of the spool during the pressure compensation phase.
