Analysis and Improvement of Dynamic Characteristics of Lift Check Valves

Abstract

Aimed at the problem that lift check valves cannot fall back to the normal position, the dynamic simulation of unsteady flow in the process of opening and falling back are conducted by using PumpLinx, and the structure of the valve body is proposed and improved. The dynamic response and internal flow field distribution of the prototype and the improved check valves are obtained. The results show that the dynamic opening time and small gap falling time of the improved check valve are significantly reduced by more than 50% compared with those of the prototype. The four additional guide grooves of the improved check valve can promptly discharge the squeezed fluid from the valve core during dynamic opening, and can promptly supplement the fluid when it falls back, so that the fluid force, the pulsation, and the velocity oscillation are weakened, which can make the valve core stable without easy deflection in the dynamic process. Therefore, the check valve proposed can improve the flow stability and solve the problem that the check valve cannot fall back normally.

Keywords

• lift check valve
• opening process
• small gap falling process
• dynamic characteristics
• numerical simulation