How to Deal with Poor Stability of Pneumatic Valves

Pneumatic valves are specialized air compression-driven devices, known for their excellent external control and stability. However, like all equipment, they are subject to aging and damage, leading to decreased stability at times. So, how should one address this issue?
 
1. Altering the Direction of Unbalanced Forces
When faced with an unstable pneumatic valve, stability analysis can help determine if there's a correlation between the valve direction and the presence of unbalanced forces. If there's evidence of valve closure under unbalanced force, indicating low stability, adjusting the direction of action, such as changing from flow-closed to flow-open mode, can help alleviate the issue.
 
2. Reducing the Unstable Working Range of the Valve
Some valves, due to their construction and structural differences, exhibit poor stability in certain environments. In such cases, employing double-seated valves and adjusting the slope of unbalanced forces can enhance stability. Additionally, efforts should be made to keep pneumatic valves away from unstable working ranges during operation.
 
3. Increasing Spring Stiffness
Spring stiffness affects both the pneumatic valve's resistance to pressure and load-bearing capacity. Generally, higher spring stiffness translates to greater pressure resistance and improved stability of the valve. Therefore, for valves with poor stability, increasing the stiffness of the spring can enhance the stability of the valve body.
 
4. Disruption of Fluid Flow
Double-seated valves typically have fluid entering from the middle, with the valve core perpendicular to the inlet. This setup results in fluid impacting both sides of the valve body, causing friction and damage, thereby reducing stability. To address this, enhancing the hardness and quality of materials used in the guiding parts and opting for superior valves can help. Additionally, increasing the size of the valve core to thicken it can mitigate instability.