Check valves
Check valves also called as non-return valves. They design to allow the flow to pass through them in only one direction and stop the flow in reverse direction. Tight shutoff can be difficult to achieve in case back pressures are low. The valve will leak the fluid in such situations.
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![Check valves](https://besflow.com/wp-content/uploads/2024/05/besflow-bes-check-valves.jpg)