Final answer:
A check valve is a mechanical device that allows fluid to flow in only one direction. It prevents leakage of natural gas in a CNG fuel receptacle. This design maintains the safety and efficiency of CNG fuel systems.
Step-by-step explanation:
The question is related to engineering, specifically the design of a check valve for a CNG fuel receptacle. A check valve is a mechanical device that allows fluid to flow in only one direction. In this case, it ensures that the natural gas flows into the receptacle but does not escape back out, preventing leakage.
Have you ever blown up a balloon and then let the air escape? The check valve functions in a similar way. The gas flows into the first flask containing a vacuum, and once the valve is opened, it distributes evenly between the two flasks. This design ensures the gas is contained within the receptacle.
This concept is important in engineering and plays a crucial role in maintaining the safety and efficiency of CNG fuel systems.