Antidrainbackventtiili

Antidrainbackventtiili, also known as an anti-drainback valve, is a component used in certain lubrication systems, particularly in automotive engines and other machinery. Its primary function is to prevent lubricating oil from draining out of the system, such as the oil filter and oil passages, when the engine or machine is shut off. This is crucial for ensuring that the engine or machine receives immediate lubrication upon startup, minimizing wear and tear during the critical moments before oil pressure is fully established.

The valve typically consists of a spring-loaded flap or diaphragm that remains closed when the system is not operating, effectively creating a seal that holds the oil in place. When the system is running and oil pressure is present, the pressure overcomes the spring force, opening the valve and allowing oil to flow freely. Upon shutdown, the pressure drops, and the spring pushes the flap or diaphragm back to its closed position, preventing the oil from flowing back down into the sump.

This feature is especially important in applications where the oil filter is mounted above the oil sump, or where long periods of inactivity are common. Without an anti-drainback valve, the oil could slowly seep out, leading to dry starts and increased friction and wear. Some oil filters are designed with an integrated anti-drainback valve, while in other systems, it might be a separate component. The effectiveness of the anti-drainback valve is a key factor in engine longevity and performance.