The impact of check valve performance parameters on system stability: the key role of opening and closing pressure difference

1. Basic functions and importance of check valves
Check valves, also known as one-way valves or reverse flow valves, are valves that only allow fluid to flow in one direction. When fluid flows in from the inlet, the valve automatically opens to allow the fluid to pass; when the fluid tries to flow back from the outlet, the valve automatically closes to prevent the backflow. This feature is crucial to protecting key equipment such as pumps and compressors in the system from backflow impact, while also ensuring the unidirectional fluidity and stability of the system.

2. The impact of opening and closing pressure difference on system stability
The opening and closing pressure difference of the check valve is a key link in its performance parameters. The opening pressure refers to the minimum pressure difference required for the valve to start allowing fluid to pass, while the closing pressure difference refers to the minimum pressure difference required for the valve to be completely closed and prevent the fluid from flowing back. The setting of these two parameters has an important impact on the stability of the system.

If the opening pressure difference of the check valve is too high, the valve may not be able to open in time, resulting in fluid accumulation in the pipeline, increasing system pressure, and even causing safety accidents such as pipeline rupture. On the contrary, if the opening pressure difference is too low, the valve may open too early when it is not needed, causing fluid backflow or system pressure fluctuations, affecting the normal operation of the system.

Similarly, inappropriate closing pressure difference can also have a negative impact on system stability. If the closing pressure difference is insufficient, the valve may not be fully closed, causing fluid backflow and damage to the equipment in the system. If the closing pressure difference is too large, the valve may close too early when it is not needed, causing the system pressure to rise, and may even cause system shutdown or failure.

3. Challenges and solutions in practical applications
In practical applications, the opening and closing pressure differences of check valves are often affected by many factors, such as fluid characteristics, pipeline layout, system pressure, etc. Therefore, when selecting and installing check valves, these factors need to be considered comprehensively to ensure that the performance parameters of the valve meet the system requirements.

A common solution is to use an adjustable check valve. This valve allows the user to adjust the opening and closing pressure differences according to system requirements, thereby ensuring that the valve works in the best condition. In addition, check valves with higher precision and stability, such as spring check valves or hydraulic check valves, can also be used to further improve the stability and reliability of the system.