Check valves play an important role in petrol systems and vacuum boosters. They ensure that liquids or gases can only flow in one direction and prevent backflow, which can cause malfunctions. In gasoline systems, it is important to maintain proper fuel flow and pressure to the engine, and these valves help control this by allowing the fuel to flow in one direction to the engine and prevent it from returning to the tank when you turn the engine off.
Vacuum amplifiers, which are found in brake systems, use the engine's vacuum to increase the braking force. One-way valves within the vacuum intensifier ensure that the vacuum is maintained and does not escape when the driver gives full throttle or boost pressure builds up. This ensures constant braking force and improves braking efficiency. Thus, non-return valves and one-way valves contribute to maintaining correct function and safety in both petrol systems and vacuum amplifiers.